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  • Simulations of the Surfaces of Soda Lime Aluminoborosilicate Glasses Exposed to Water
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-19
    Stephen H. Garofalini, Ming Tai Ha, Joelyn Urraca

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-19
  • Impedance Spectroscopy of Bismuth Sodium Titanate – Barium Titanate Ceramics with Manganese Doping
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-18
    V. Hugo Schmidt, Noah Archer, Chi-Shun Tu

    In this work we use Impedance Spectroscopy (IS) to study lead-free ceramics of perovskite structure (Bi1/2Na1/2TiO3)0.925(BaTiO3)0.075 with Mn doping of 0, 0.2, 1.0, and 2.0 atomic%. We compare our IS results with permittivity results, using dielectric to resistivity transformation equations which allow us to display results either as permittivity or as resistivity. We observe ionic conductivity dominating at lower temperatures, giving way to electronic conductivity at higher temperatures. The permittivity shows deviations from Curie-Weiss behavior characteristic of relaxor ferroelectrics. The 0.2% Mn samples show the highest ionic resistivity, which will reduce heating for high voltage piezoelectric applications. They also have the highest Curie-Weiss temperature and Burns temperature.

    更新日期:2017-09-18
  • Superior thermal stability of polymer capped Fe3O4 magnetic nanoclusters
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-18
    Ayyappan Sathya, Thoguluva R. Ravindran, John Philip

    In general, the technologically important ferrites nanoparticles, magnetite and maghemite, are converted from cubic to the more stable rhombohedral structure above 500°C-700°C under air/vacuum/inert atmosphere. Here, we report, the superior thermal stability of polymer capped Fe3O4 (PCIO) nanocluster (synthesized using microwave-assisted polyol approach) up to 1000°C under vacuum and inert atmosphere. Raman spectra of post annealed PCIO nanoclusters show the Fe3O4 phase with carbon signature due to the decomposition of polymer matrix. The carbon layer seems to act as a thermal shield and increases the activation energy thereby preventing the intrusion of heat, oxygen, volatiles mass into the magnetic core. The presence of carbon layer was further confirmed from the high-resolution transmission electron microscopic image. After thermal annealing at 1000°C, PCIO nanoclusters showed superparamagnetic behavior with a saturation magnetization of 89 emu/g, close to the bulk saturation magnetization of Fe3O4 phase. In contrast, the uncoated Fe3O4 (UCIO) nanoclusters decompose at 700°C into α-Fe2O3 and FeO phases under similar annealing conditions. Our findings open up new possibilities of stabilizing nanomaterials for high-temperature applications.

    更新日期:2017-09-18
  • Synthesis of Eu3+-doped BaBi2Ta2O9 based glass-ceramic nanocomposites: Optical and dielectric properties
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-18
    Anirban Chakrabarti, Anal Tarafder, Atiar Rahaman Molla

    In this paper we report for the first time synthesis of Eu3+-doped transparent glass-ceramics (TGC) with BaBi2Ta2O9 (BBT) as the major crystal phase using the glass system SiO2–K2O–BaO–Bi2O3–Ta2O5 by melt quenching technique followed by controlled crystallization through ceramming heat treatment. DSC studies were conducted in order to determine a novel heat-treatment protocol to attain transparent GCs by controlling crystal growth. The structural properties of the BBT GCs have been investigated using XRD, FE-SEM, TEM and FTIR reflectance spectroscopy. Optical band gap energies of the glass-ceramic samples were found to decrease with respect to the precursor glass. An increased intensity of emission along with increase in the average lifetime of Eu3+ was observed due to incorporation of Eu3+ ions into the low-phonon energy BBT crystal site. The local field asymmetric ratios of all the samples were observed greater than unity. The dielectric constant (εr), dielectric loss, and dissipation factor values of both the base glass and ceramized samples were found to decrease with increase in frequency.

    更新日期:2017-09-18
  • High niobium oxide content in germanate glasses: Thermal, structural, and optical properties
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-18
    Lia Mara Marcondes, Sérgio Maestri, Bianca Sousa, Rogeria Rocha Gonçalves, Fabia Castro Cassanjes, Gael Yves Poirier

    Niobium alkali germanate glasses were synthesized by the melt-quenching technique. The ternary system (90-x)GeO2–xNb2O5–10K2O forms homogeneous glasses with x ranging from 0 to 20 mol%. Samples were investigated by DSC and XRD analysis, FTIR and Raman spectroscopy, and optical absorption. Structural and physical features are discussed in terms of Nb2O5 content. The niobium content increase in the glass network strongly modifies the thermal, structural and optical properties of alkali germanate glasses. DSC, Raman and FTIR analysis suggest niobium addition promotes NbO6 groups insertion close to GeO4 units of the glass network. XRD analysis also pointed out that samples containing high niobium oxide contents exhibit preferential niobium oxide-rich phase after crystallization after heat treatment, which is similar to orthorhombic Nb2O5. Absorption spectra revealed high transmission range between 400 nm to 6.2 μm, added to a considerably decreased hydroxyl group content as the addition of niobium in the alkali germanate network. The niobium oxide-rich phase crystallization process was studied and activation energy was determined, as well as nucleation and crystal growth temperatures and time for obtaining transparent glass-ceramics.

    更新日期:2017-09-18
  • Synergistically optimizing electrical and thermal transport properties of Bi2O2Se ceramics by Te-substitution
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-18
    Xing Tan, Yaochun Liu, Kerong Hu, Guangkun Ren, Yueming Li, Rui Liu, Yuan-Hua Lin, Jin-Le Lan, Ce-Wen Nan

    Bi2O2Se oxyselenides, characterized with intrinsically low lattice thermal conductivity and large Seebeck coefficient, are potential n-type thermoelectric material in the mediate temperature range. Given the low carrier concentration of ~1015 cm−3 at 300 K, the intrinsically low electrical conductivity actually hinders further enhancement of their thermoelectric performance. In this work, the isovalent Te-substitution of Se plays an effective role in narrowing the band gap, which notably increases the carrier concentration to ~1018 cm−3 at 300 K and the electron conduction activation energy has been lowered significantly from 0.33 to 0.14 eV. As a consequence, the power factor has been improved from 104 μW·K−2·m−1 for pristine Bi2O2Se to 297 μW·K−2·m−1 for Bi2O2Se0.96Te0.04 at 823 K. Meanwhile, the suppressed lattice thermal conductivity derives from the introduced point defects by heavier Te atoms. The gradually decreased phonon mean free path reflects the increasingly intense phonon scattering. Ultimately, the ZT value attains 0.28 for Bi2O2Se0.96Te0.04 at 823 K, an enhancement by a factor of ~2 as compared to that of pristine Bi2O2Se. This study has demonstrated that Te-substitution of Se could synergistically optimize the electrical and thermal properties thus effectively enhancing the thermoelectric performance of Bi2O2Se.

    更新日期:2017-09-18
  • Compositional dependence of crystallization in Ge–Sb–Se glasses relevant to optical fiber making
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-18
    Harriet Parnell, David Furniss, Zhuoqi Tang, Nigel C. Neate, Trevor M. Benson, Angela B. Seddon

    For fiber-optic mid-infrared bio- and chemical-sensing, Ge–Sb–Se glass optical fibers are more attractive than Ge–As–Se because of: (i) lowered toxicity and (ii) lower phonon energy and hence transmission to longer wavelengths, with potential to reach the spectral “fingerprint region” for molecular sensing. There is little previous work on Ge–Sb–Se fibers. Here, fibers are fabricated from two glass compositions in the GexSb10Se90−x atomic (at.) % series. Both glass compositions are of similar mean-coordination-number, lying in the overconstrained region, yet of different chemical composition: stoichiometric Ge25Sb10Se65 at. % and non-stoichiometric Ge20Sb10Se70 at. %. Thermal analysis on bulk glasses has previously shown that the former exhibited the maximum glass stability of the series. However, during fiber-drawing of Ge25Sb10Se65 at. %, the preform tip is found to undergo surface-devitrification to monoclinic GeSe2 alone, the primary phase, no matter if the preform is an annealed, as-melted rod or annealed, extruded rod. The heating rate of the preform-tip to the fiber-drawing temperature is estimated to be up to ~100°C/min to ~490°C. Lower heating rates of 10°C/min using thermal analysis, in contrast, encourage crystallization of both Sb2Se3 and GeSe2. The non-stoichiometric: Ge20Sb10Se70 at. % composition drew successfully to low optical loss fiber, no matter whether the preform was an annealed, as-melted rod or annealed, extruded rod.

    更新日期:2017-09-18
  • Thermal stability and electric-field-induced strain behaviors for PIN-PSN-PT piezoelectric ceramics
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-18
    Dabin Lin, Shun Zhou, Weiguo Liu, Fei Li

    Pb (In1/2Nb1/2) O3-Pb (Sc1/2Nb1/2) O3-PbTiO3 (PIN-PSN-PT) ternary ceramics with compositions near morphotropic phase boundary (MPB) were fabricated by solid-state-sintering process. Dielectric and piezoelectric properties of xPIN-yPSN-zPT (x = 0.19, 0.23 and z = 0.365, 0.385) ceramics were investigated as a function of temperature, showing high Tr-t and Tc on the order of 160 ~ 200°C and 280 ~ 290°C, respectively. The xPIN-yPSN-0.365PT (x = 0.19 and 0.23) ceramics do not depolarize at the temperature up to 200°C, showing a better thermal stability when compared to the state-of-the-art relaxor-PbTiO3 systems. A slight variation (<9%) of kp, kt, and k33 was observed in the temperature range of 25°C-160°C for xPIN-yPSN-0.385PT (x = 0.19 and 0.23) ceramics. Rayleigh analysis was employed to quantify the contribution of domain wall motion to piezoelectric response, where the domain wall contribution was found to increase with composition approaching MPB for PIN-PSN-PT system.

    更新日期:2017-09-18
  • Combustion synthesis of InSe, In2Se3, and GaSe
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-18
    Guanghua Liu, Kexin Chen, Jiangtao Li

    InSe, In2Se3, and GaSe are important III-VI semiconductors and are attractive for electronic, optical, and optoelectronic applications. This paper reports a fast and cheap way called combustion synthesis to prepare InSe, In2Se3, and GaSe. Bulk samples with relative densities up to 98% are directly produced in a few seconds. The samples show a high phase purity, correct stoichiometry, and lamellar crystals larger than 100 μm. By optical absorption, the bandgaps of InSe, In2Se3, and GaSe are determined to be 1.08, 1.24 and 1.75 eV, respectively.

    更新日期:2017-09-18
  • Effects of Re addition on phase stability and mechanical properties of hexagonal OsB2
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-18
    Ying Long, Canhui Zou, Xin Zheng, Hua-Tay Lin, Fenglin Zhang, Chengyong Wang, Linan An

    ReB2-type hexagonal Osmium diboride (OsB2) has been predicted to exhibit higher hardness than its orthorhombic phase, but hexagonal-orthorhombic phase transformation occurs at temperature higher than 600°C, resulting in the decrease in its hardness. Therefore, ReB2-type hexagonal OsB2 samples with Re addition were produced by a combination of mechanochemical method and pressureless sintering technique, and the effects of Rhenium (Re) addition on phase composition, thermal stability and mechanical properties of OsB2 were investigated in this study. X-ray diffraction (XRD) analysis of the as-synthesized powders by high-energy ball milling indicates the formation of hexagonal Os1-xRexB2 solid solution with Re concentration of 5 and 10 at.% without forming a second phase. After being sintered at 1700°C, part of the hexagonal phase in OsB2 transformed to orthorhombic structure, while Os0.95Re0.05B2 and Os0.9Re0.1B2 maintained their hexagonal structure. This suggests that the thermal stability of the hexagonal OsB2 was significantly improved with the addition of Re. Scanning electron microscopy (SEM) photographs show that all of the as-sintered samples exhibit a homogeneous microstructure with some pores and cracks formed throughout the samples with the relative density >90%. The measurements of micro-hardness, nano-hardness, and Young's modulus of the OsB2 increased with Re addition, and these properties of the sample with 5 at.% addition of Re is higher than that with 10 at.% Re.

    更新日期:2017-09-18
  • Size driven thermodynamic crossovers in phase stability in zirconia and hafnia
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-18
    Geetu Sharma, Sergey V. Ushakov, Alexandra Navrotsky

    Hafnia (HfO2) and zirconia (ZrO2) are of great interest in the quest for replacing silicon oxide in semiconductor field effect transistors because of their high permittivity. Both exhibit extensive polymorphism and understanding the energetics of their transitions is of major fundamental and practical importance. In this study, we present a systematic thermodynamic summary of the influence of particle size on thermodynamic phase stability in hafnia and zirconia using recently measured enthalpy data from the literature. The amorphous phase is found to be the most energetically stable above 165 and 363 m2/g of surface area for HfO2 and ZrO2, respectively. Below 16 and 20.3 m2/g of surface area, respectively, the monoclinic phase is the most energetically stable for HfO2 and ZrO2. At intermediate sizes there are closely balanced energetics among monoclinic, tetragonal, and cubic phases. The energy crossovers reflect decreasing surface enthalpy in the order monoclinic, tetragonal, cubic and amorphous for both hafnia and zirconia.

    更新日期:2017-09-18
  • Manipulating Bi NIR emission by adjusting optical basicity, boron and aluminium coordination in borate laser glasses
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-16
    Yafei Xue, Jiangkun Cao, Ziyang Zhang, Liping Wang, Shanhui Xu, Mingying Peng

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-18
  • Transparent ultrafine Yb3+:Y2O3 laser ceramics fabricated by spark plasma sintering
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-15
    Hiroaki Furuse, Shunsuke Nakasawa, Hidehiro Yoshida, Koji Morita, Tohru S. Suzuki, Byung-Nam Kim, Yoshio Sakka, Keijiro Hiraga

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-16
  • Single CaO accelerated densification and microstructure control of highly transparent YAG ceramic
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-15
    Le Zhang, Tianyuan Zhou, Farida A Selim, Hao Chen

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-15
  • K2CaSi4O10 – a novel phase in the ternary system K2O-CaO-SiO2 and member of the litidionite group of crystal structures
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-15
    Daniela Schmidmair, Volker Kahlenberg, Anja Grießer

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-15
  • Low temperature synthesis of TaB2 nanorods by molten-salt assisted borothermal reduction
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-14
    Tingting Wei, Zetan Liu, Donglou Ren, Xiangong Deng, Qihuang Deng, Qing Huang, Songlin Ran

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-15
  • Nd3+-doped Silicate Glasses as an Efficient Color Filter to Improve the Color Gamut of a White LED
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-14
    Karam Han, Yong Hwan Kim, Gi Won Chung, Chun Hwa Shin, Hun Hwang, Woon Jin Chung

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-15
  • Controllable τf value of barium silicate microwave dielectric ceramics with different Ba/Si ratios
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-13
    Wen Lei, Zheng-Yu Zou, Ze-Hao Chen, Burhan Ullah, Aurang Zeb, Xue-Kai Lan, Wen-Zhong Lu, Gui-Fen Fan, Xiao-Hong Wang, Xiao-Chuan Wang

    Ba1+1/M[Si2O5+1/M] low-permittivity microwave dielectric ceramics are prepared using the conventional solid-state method. Pure phases are obtained in barium silicates with M = 1, 3, 4, 5, and ∞, except for M = 7, in which two phases, Ba5Si8O21 and BaSi2O5, are observed. As the complexity of the crystal structure described by the Shannon information per reduced unit cell increases, the τf value tends to change from a negative to a positive value, except for M = 5, which has the highest complexity. A single Ba5Si8O21 phase with εr anomaly peak at −180°C exhibits a rare positive τf value (+25 ppm/°C), which is a novel temperature compensator.

    更新日期:2017-09-13
  • Phase transformations in the relaxor Na1/2Bi1/2TiO3 studied by means of density functional theory calculations
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-13
    Kai-Christian Meyer, Leonie Koch, Karsten Albe

    The relaxor material Na1/2Bi1/2TiO3 (NBT) is an important basis for the development of lead-free piezoceramics, but still many features of this material are not well understood. Here, we study the kinetics of phase transformations by octahedral tilts and A-cation displacements in NBT by means of density functional theory calculations, employing ab initio molecular dynamics and nudged elastic band calculations. Our results show that the energetic differences between the low temperature rhombohedral, intermediate orthorhombic and other metastable phases are close to the room temperature thermal energy. Therefore, it is likely that above room temperature, several octahedral tilt patterns are present simultaneously on the local scale, just because of thermal vibration of the oxygen ions. Octahedral tilt transformations and A-cation displacements show similarly high energy barriers, however, since the vibrational frequency of oxygen is higher, tilt transformations occur more frequently. Further, tilt transformations in which the oxygen octahedra get deformed the least are more probable to occur. We also find that the chemical A-cation order affects energy barriers, influences the coupling between rotational and displacive modes and determines the stability of certain octahedral tilt orders. We conclude that the so-called polar nanoregions in this material result from local octahedral tilt transformations and subsequent A-cation displacements, which are driven by thermal vibration and are mediated by the underlying chemical order.

    更新日期:2017-09-13
  • Structure and physical properties of Ge15Sb20Se65-xSx glasses
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-13
    Rongping Wang, Qin Xu, Haitao Liu, Yan Sheng, Xinyu Yang

    We explored the structure and physical properties of Ge15Sb20Se65-xSx (with x = 0, 16.25, 32.5, 48.75, and 65) glasses in order to screen the best compositions for the applications in photonics, since the laser damage thresholds in Se-based glasses are too low although their optical nonlinearities are high. We found that, linear and nonlinear refractive index of the glasses decreased, but glass transition temperature Tg, optical bandgap Eg and the laser damage threshold increased with increasing S content. We further employed Raman scattering and high-resolution X-ray photoelectron spectra to probe the structure of the glasses. Through the analysis of the evolution of the different structural units in the glasses, it was concluded that, the heteropolar bonds (Ge–Se/S, Sb–Se/S) were dominated in these glasses. With the increase in chalcogen Se/S ratio, the number of the Se-related chemical bonds (Ge–Se, Sb–Se and Se–Se) increased and that of S-related chemical bond (Ge–S, Sb–S and S–S) decreased gradually, and Ge was prior to bond with S rather than Se. The elemental substitution thus had negligible effect on the glass structure. The change of the physical properties was mainly due to the difference of the strength of the chemical bonds between S–Ge(Sb) and Se–Ge(Sb).

    更新日期:2017-09-13
  • Colossal permittivity in TiO2 co-doped by donor Nb and isovalent Zr
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-13
    Chao Yang, Xianhua Wei, Jianhua Hao

    Effect of isovalent Zr dopant on the colossal permittivity (CP) properties was investigated in (Zr + Nb) co-doped rutile TiO2 ceramics, i.e., Nb0.5%ZrxTi1−xO2. Compared with those of single Nb-doped TiO2, the CP properties of co-doped samples showed better frequency-stability with lower dielectric losses. Especially, a CP up to 6.4 × 104 and a relatively low dielectric loss (0.029) of x = 2% sample were obtained at 1 kHz and room temperature. Moreover, both dielectric permittivity and loss were nearly independent of direct current bias, and measuring temperature from room temperature to around 100°C. Based on X-ray photoelectron spectroscopy, the formation of oxygen vacancies was suppressed due to the incorporation of Zrions. Furthermore, it induced the enhancement of the conduction activation energy according to the impedance spectroscopy. The results will provide a new routine to achieve a low dielectric loss in the CP materials.

    更新日期:2017-09-13
  • Investigation of sulfide capacity of aluminosilicate slag based on ionic structure considerations
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-12
    Sunghee Lee, Dong Joon Min

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-12
  • Micro-to-nano domain structure and orbital hybridization in rare-earth doped BiFeO3 across morphotropic phase boundary
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-12
    Cheng-Sao Chen, Chi-Shun Tu, Pin-Yi Chen, Wei Sea Chang, Y. U. Idzerda, Yi Ting, Jenn-Min Lee, Chang Wei Yu

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-12
  • Experimental phase equilibria studies of the PbO–SiO2 system
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-12
    Maxim Shevchenko, Evgueni Jak

    Phase equilibria of the PbO–SiO2 system have been established for a wide range of compositions: (i) liquid in equilibrium with silica polymorphs (quartz, tridymite, and cristobalite) between 740°C and 1580°C, at 60-90 mol% SiO2; (ii) with lead silicates (PbSiO3, Pb2SiO4, and Pb11Si3O17) and lead oxide (PbO) between 700°C and 810°C. A high-temperature equilibration/quenching/electron probe X-ray microanalysis (EPMA) technique has been used to accurately determine the compositions of the phases in equilibrium in the system. Significantly, no liquid immiscibility has been found in the high-silica range, and the liquidus in this high-silica region has been accurately measured. The phase equilibria information in the PbO–SiO2 system is of practical importance for the improvement of the existing thermodynamic database of lead-containing slag systems (Pb–Zn–Fe–Cu–Si–Ca–Al–Mg–O).

    更新日期:2017-09-12
  • Near-zero thermal expansion transparent lithium aluminosilicate glass-ceramic by microwave hybrid heat treatment
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-12
    C. Venkateswaran, Sharad C. Sharma, Vishal S. Chauhan, Rahul Vaish

    The material of choice for space applications which demand very high dimensional stability is lithium aluminosilicate (LAS) based Ultra Low thermal Expansion Glass-Ceramic (ULEGC). Generally, the controlled crystallization process recommended for the processing of transparent ULEGC involves a long soaking duration to achieve the required crystal number density. This paper brings out the process optimization procedure adopted for realizing transparent and nanocrystalline ULEGC from conventionally processed LAS glass using microwave-assisted (hybrid) crystallization. The experimental strategy involves two stages (i) identification of the optimum crystallization temperature (Tc) under a microwave field (ii) optimization of a microwave-assisted crystallization process to achieve near zero Coefficient of Thermal Expansion (CTE).. Optimum heat-treatment schedules for nucleation and crystallization under a microwave environment were found to be 720°C/24 hours and 775°C/0.3 hours, respectively. The optimized heat-treatment condition revealed the efficacy of the microwave hybrid heating, by producing nanocrystalline (35-50 nm) and transparent (>82%) ULEGC having a thermal expansion of −0.03 × 10−6 K (0°C to 50°C).

    更新日期:2017-09-12
  • Architectural design and cryogenic synthesis of Si3N4@(TiN–Si3N4) for high conductivity
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-12
    Mei Yang, Mingli Lv, Qi Wang, Hongmin Zhu

    Si3N4@(TiN–Si3N4) composites with heteroshelled structure were designed for enhanced conductivity and successfully synthesized through the simultaneous reduction and in-situ cocoating process in liquid ammonia at around −40°C. The heteroshells were composed of nanosized TiN and Si3N4 particles, which were amorphous with the size ranging from 10 to 40 nm. Using spark plasma sintering, dense bulk composite with >98.1% relative density of theoretical value were obtained and their electrical conductivity were increased to an adequate value (6.62 × 102 S·cm−1) for electrical discharge machining by compositing 15 vol% TiN to Si3N4, which is superior to the previous reports. The excellent electric performance could be attributed to the heteroshelled structure which guarantees the conductive network can be formed and kept with minimal TiN content. The nanosized Si3N4 powders in the shells reduce the content of conductive powders and limit the growth of TiN particles.

    更新日期:2017-09-12
  • Structure-Property Relationships in BiScO3-PbTiO3-PbMg1/3Nb2/3O3 Ceramics Near the Morphotropic Phase Boundary
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-11
    Mikhail V. Talanov, Alexander A. Bush, Konstantin E. Кamentsev, Vladimir P. Sirotinkin, Andrei G. Segalla

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-11
  • Mullite-glass and mullite-mullite interfaces: Analysis by molecular dynamics (MD) simulation and high-resolution TEM
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-11
    Esmaeil Adabifiroozjaei, Judy N. Hart, Pramod Koshy, David R. G. Mitchell, Charles C. Sorrell

    The properties of mullite-glass and mullite-mullite interfaces have been investigated at 1800 K by molecular dynamics (MD) simulation and high-resolution TEM. The simulation showed that mullite-glass interfaces typically have much lower interfacial energies than mullite-mullite interfaces, which results from the structural flexibility of the glass and associated accommodation of interfacial mismatch. The (110)-glass interface has the lowest energy of all interfaces studied, which is consistent with the observed dominance of this interface in experimental mullite-glass samples examined by TEM. The simulation shows that the interfacial energies of the (100)-glass and (010)-glass interfaces are higher than that those of the (001)-glass interface, so [100] and [010] would be expected to be the dominant growth directions. However, the growth of mullite in glass occurs predominantly in the [001] direction. This apparent discrepancy can be explained by the fact that growth in the [100] and [010] directions is limited by the slow growth of (110) plane (i.e., [110] direction), which facilitates [001] growth, which is confirmed by the TEM data.

    更新日期:2017-09-11
  • A comprehensive study on compositional and structural changes in 45S5 bioglass products exposed to simulated body fluid
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-11
    Selena Montinaro, Luca Desogus, Roberto Orrù, Sebastiano Garroni, Francesco Delogu, Pier Carlo Ricci, Giacomo Cao

    The interaction of fully dense 45S5-bioglass derived samples produced by Spark Plasma Sintering (SPS) with simulated body fluid (SBF) solution was investigated in detail taking advantage of the Rietveld refinement method to quantitatively evidence the corresponding microstructural and compositional changes. It is observed that, when the original amorphous nature is mostly (75 wt%) preserved in the material during sintering (550°C, 2 minutes), the resulting specimens dissolve faster and determine relatively higher pH increase and ions release in the SBF solution. Correspondingly, a relatively lower amount of hydroxycarbonate apatite (HCA) is formed on their surface. In contrast, a more extensive apatite layer with trabecular structure is generated within 3 days storage on the surface of fully crystallized samples obtained at 600°C by SPS, which only consists of Na–Ca silicate grains (20 nm). Moreover, as the sintering temperature and dwell time were increased to 700°C and 20 minutes, respectively, a rhenanite-like phase was also formed (about 15 wt%), other than crystallites growth to 90 nm. Interestingly, the presence of rhenanite provides a beneficial contribution for the production of the HCA layer, which was found the largest for this system when considering storage periods of 7 and 14 days, respectively.

    更新日期:2017-09-11
  • BaO−B2O3 system and its mysterious member Ba3B2O6
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-11
    Tatyana B. Bekker, Sergey V. Rashchenko, Yurii V. Seryotkin, Alexander E. Kokh, Aleksey V. Davydov, Pavel P. Fedorov

    The first systematic study of the BaO–B2O3 system and barium orthoborate Ba3B2O6 (3BaO·B2O3) was reported in 1949. Thereafter, the system was repeatedly refined but the structure of Ba3B2O6 compound has not been adequately studied yet. In our study we have, for the first time, obtained the crystalline samples of Ba3B2O6. The solved structure (Pbam, a = 13.5923(4) Å, b = 13.6702(4) Å, c = 14.8894(3) Å) belongs to the class of ‘anti-zeolite’ borates with a pseudotetragonal [Ba12(BO3)6]6+ cation pattern which contains channels along the c axis filled with anionic clusters. The Ba3B2O6 compound may be regarded as a fluorine-free end-member of the Ba3(BO3)2–xF3x solid solution. The BaO–B2O3 phase diagram presented in our study is based on our research and literature data.

    更新日期:2017-09-11
  • Cytotoxicity, chemical stability, and surface properties of ferroelectric ceramics for biomaterials
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-11
    Matias Acosta, Rainer Detsch, Alina Grünewald, Virginia Rojas, Jan Schultheiß, Aleksandra Wajda, Robert W. Stark, Suman Narayan, Maciej Sitarz, Jurij Koruza, Aldo R. Boccaccini

    Surface chemistry and topo-physical properties determine the interactions of biomaterials with their physiological environment. Ferroelectrics hold great promise as the next generation of scaffolds for tissue repair since they feature tunable surface electrical charges, piezoelectricity, and sensing capabilities. We investigate the topography, wettability, chemical stability, and cytotoxicity in salient ferroelectric systems such as (1−x) (Na1/2Bi1/2)TiO3–xBaTiO3, (1−x)Ba(Zr0.2Ti0.8)O3−x(Ba0.7Ca0.3)TiO3, and Pb(Zr,Ti)O3 to test their suitability as biomaterials. The lead-free ferroelectrics promote in vitro cell viability and proliferation to a considerably high extent. 0.94 mol % (Na1/2Bi1/2)TiO3–0.06 mol% BaTiO3 showed the greatest potential leading to a cell viability of (149 ± 30)% and DNA synthesis of (299 ± 85)% in comparison to the reference. Lead leaching from Pb(Zr,Ti)O3 negatively affected the cultured cells. Wettability and chemical stability are key factors that determine the cytotoxicity of ferroelectrics. These variables have to be considered in the design of novel electroactive scaffolds based on ferroelectric ceramics.

    更新日期:2017-09-11
  • Parameters for spray drying ZnO nanopowders as spherical granules
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-11
    Ömer Yıldız, Ali Murat Soydan

    Spray drying is a versatile method to perform atomization, drying, and granulation. Spray dryers enable agglomeration of particles into a spherical granule form with a nano-meter size and thus very high specific surface areas (SSA). For this, the synthesized Zn(OH)2 precipitate should be concurrently atomized and dried under desired spray drying conditions. The drying process has many complex and critical parameters. In order to obtain ZnO nanopowders in a spherical granule form the inlet temperature and the flow rate of the hot air, the feeding rate and the solid-liquid ratio of the suspension, need to be optimized for 150°C ≤ ITHA ≤ 180°C, 5 mL/min ≤ FRS ≤ 15 mL/min, 50 g/L ≤ SLRS ≤ 200 g/L, 0.4 m3/min ≤ FRHA ≤ 0.6 m3/min and 60°C ≤ OTDC ≤ 90°C, respectively. The powders synthesized by these modifications have a range of 5-200 nm (TEM) and high SSA of 21-114 m2·g−1 (average particle size: 9-51 nm according to the SSA analyses) depending on the drying process parameters. The ZnO nanopowders have a soft granule structure according to the SSA analyses. Therefore, there is no need to grind the powders. They can be easily processed at all of the mixing and forming steps. In addition, they do not contain any contamination coming from grinding.

    更新日期:2017-09-11
  • Polymer precursor-derived HfC–SiC ultrahigh-temperature ceramic nanocomposites
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-11
    Tao Cai, Dan Liu, WenFeng Qiu, WeiJian Han, Tong Zhao

    Due to poor mechanical properties and antioxidation properties, etc of single phase ultrahigh-temperature ceramics (UHTCs), the second phase such as SiC was usually introduced for improving those properties. Herein, a novel stratagem for synthesis of binary HfC–SiC ceramics has been presented. A Hf–O–Hf polymer as a HfO2 precursor has been synthesized for preparing soluble HfC–SiC precursors with high solid content and low viscosity solutions without additional organic solvents. The structure of PHO was characterized by FTIR and 1H-NMR, the crystalline behavior and morphologies of polymer-derived ceramics were identified by XRD, SEM-EDS, and TEM. It was shown that PHO firstly transformed into HfO2, and then reacted with in situ carbon derived from DVB and PCS thus producing cubic HfC through carbothermal reduction. In addition, the obtained HfC–SiC nanopowders exhibited spherical morphology with a diameter less than 100 nm, while the Hf, Si, and C are homogeneously distributed.

    更新日期:2017-09-11
  • Compositional effects on the crosslink density of Ca–(Mg)–(Y)–Si–Al–oxyfluoronitride glasses
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-11
    Carolina Clausell, Antonio Barba, Juan Carlos Jarque, Ángel R. García-Bellés, Michael J. Pomeroy, Stuart Hampshire

    The effects of fluorine and nitrogen substitution for oxygen in aluminosilicate glasses, effectively oxyfluoronitride (OFN) glasses, modified by calcium, calcium–yttrium or calcium–magnesium on thermal and physical/mechanical properties have been compared. Thus, 42 glasses in the Ca–(Mg)–(Y)–Si–Al–O–(N)–(F) system have been prepared and characterized with respect to density (ρ), molar volume (MV), compactness (C), free volume (FV), glass transition temperatures measured by DTA (Tg,DTA) and dilatometry (Tg,dil), dilatometric softening point (TDS), microhardness (μHv) and Young's modulus (E). Gradients of property variation with nitrogen or fluorine substitutions for oxygen are similar for all three different oxyfluoronitride glass systems and are comparable with those reported for other OFN glasses, again indicating independent and additive effects of nitrogen and fluorine. In attempting to further understand how fluorine affects the cross-link density (CLD) in OFN glasses, it becomes apparent that it is necessary to allow for a greater contribution by aluminum in a modifier role as fluorine content is increased. This modified calculation of CLD values results in good linear fits between Tg and CLD values. This analysis clearly demonstrates and endorses the concepts that thermal properties are related to CLD while physical/mechanical properties are dependent on glass compactness.

    更新日期:2017-09-11
  • Evaluation of SiC/SiC minicomposites with yttrium disilicate fiber coating
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-11
    Emmanuel E. Boakye, Thomas S. Key, Triplicane A. Parthasarathy, Kristin A. Keller, Samuel J. Opeka, Randall S. Hay, Michael K. Cinibulk

    Hi-Nicalon-S/α-Y2Si2O7/SiC minicomposites were formed by polymer infiltration pyrolysis (PIP) and characterized by TEM, SEM fractography, tensile testing, and fiber push-in testing. All minicomposites with α-Y2Si2O7 fiber coatings had strengths significantly higher than the control samples without fiber coatings. Extensive fiber pullout with debonding at the coating-fiber interface or within the coating itself was observed in minicomposites with Y2Si2O7 fiber coatings, but no debonding was observed in minicomposites without fiber coatings. Debond energies of 4.5 ± 3, 4.6 ± 3 J/m2 and average sliding stresses of 91 ± 40, 94 ± 40 MPa were measured by fiber push-in tests.

    更新日期:2017-09-11
  • Enhanced electron collection efficiency of nanostructured dye-sensitized solar cells by incorporating TiO2 cubes
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-11
    Najme Sarvari, Mohammad Reza Mohammadi

    Herein, enhancement of dye-sensitized solar cell (DSC) performance is reported by combining the merits of the dye loading of TiO2 nanoparticles and light scattering, straight carrier transport path, and efficient electron collection efficiency of TiO2 cubes. We fabricate DSC devices with various arrangement styles and compositions of the electrodes in the forms of monolayer and double layer films. For this purpose, the solvothermal synthesized TiO2 cubic particles (100-600 nm) are employed as the scattering layer, whereas TiO2 nanoparticles (15-30 nm) synthesized via a combination of solvothermal and sol-gel routes are used as the active layer of devices. We improve the photovoltaic characteristics of DSCs by two mechanisms. First, the light harvesting of DSC devices made of nanoparticles is improved by controlling the thickness of monolayer films, reaching the highest efficiency of 7.0%. Second, the light scattering and electron collection efficiency are enhanced by controlling the composition of double layer films composed of mixtures of TiO2 nanoparticles and cubes, obtaining the maximum efficiency of 8.21%. The enhancements are attributed to balance between charge transfer resistance and charge recombination of photo-generated electrons as well as dye loading and light scattering.

    更新日期:2017-09-11
  • Combustion synthesis of InSe, In2Se3 and GaSe
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-11
    Guanghua Liu, Kexin Chen, Jiangtao Li

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-11
  • High temperature oxidation and compressive strength of Cr2AlC MAX phase foams with controlled porosity
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-11
    J. Gonzalez-Julian, S. Onrubia, M. Bram, C. Broeckmann, R. Vassen, O. Guillon

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-11
  • Effects of Strontium doping on the degradation and Sr ion release behaviors of α-tricalcium phosphate bone cement
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-08
    Haishan Shi, Shenghui Zeng, Xu Liu, Tao Yu, Changren Zhou

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-08
  • Enhanced photoluminescence property and mechanism of Eu3+ doped tellurite glasses by the silver and gold nanoparticles
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-08
    Chengye Yu, Zhengwen Yang, Jianbei Qiu, Zhiguo Song, Zhou Dacheng

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-08
  • Sol-Gel Derived TiNb2O7 Dielectric Thin Films for Transparent Electronic Applications
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-08
    Ming-Chuan Chang, Chieh-Szu Huang, Yi-Da Ho, Cheng-Liang Huang

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-08
  • Effects of microstructure on electrochemical reactivity and conductivity in nanostructured ceria thin films
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-06
    Jilai Ding, Evgheni Strelcov, Nazanin Bassiri-Gharb

    The proton conductivity in functional oxides is crucial in determining electrochemistry and transport phenomena in a number of applications such as catalytic devices and fuel cells. However, single characterization techniques are usually limited in detecting the ionic dynamics at the full range of environmental conditions. In this report, we probe and uncover the links between the microstructure of nanostructured ceria (NC) and parameters that govern its electrochemical reaction and proton transport, by coupling experimental data obtained with time-resolved Kelvin probe force microscopy (tr-KPFM), electrochemical impedance spectroscopy (EIS), and finite element analysis. It is found that surface morphology determines the water splitting rate and proton conductivity at 25°C and wet conditions, when protons are mainly generated and transported within surface physisorbed water layers. However, at higher temperature (i.e., ≥125°C) and dry conditions, when physisorbed water evaporates, grain size, and crystallographic orientation become significant factors. Specifically, the proton generation rate is negatively correlated with the grain size, whereas proton diffusivity is facilitated by surface {111} planes and additional conduction pathways offered by cracks and open pores connected to the surface.

    更新日期:2017-09-07
  • Molecular dynamics study of correlations between IR peak position and bond parameters of silica and silicate glasses: Effects of temperature and stress
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-06
    Jiawei Luo, Yuxing Zhou, Scott T. Milner, Carlo G. Pantano, Seong H. Kim

    In the IR spectra of the silica and silicate glasses, the shifts of the maximum intensity position of the νSi–O–Si,as band upon heating or applying mechanical stress could be attributed to changes in the distribution of bond parameters such as bond length and bond angle. Upon heating, isotropic expansion occurs and the density changes; upon applying mechanical stress, anisotropic strain is induced and a significant change in the Si–O–Si bond angle is observed. From molecular dynamics simulations of a silica glass, we show that the peak position shift correlates better with the asymmetric change in the Si–O bond length distribution, rather than the Si–O–Si bridge angle, the O–Si–O tetrahedral angle, or the density change. This new finding provides an insight into how and why the νSi–O–Si,as IR peak of soda lime silica (SLS) glass shifts upon chemical strengthening via ion exchange and thermal tempering.

    更新日期:2017-09-07
  • An innovative α-calcium sulfate hemihydrate bioceramic as a potential bone graft substitute
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-06
    Heng-Jui Hsu, Rahmat Abd Waris, Muhammad Ruslin, Yun-Ho Lin, Chin-Sung Chen, Keng-Liang Ou

    The microstructural, in vitro and in vivo properties of the microwave-synthesized samples were investigated using the optical microscope, scanning electron microscope, X-ray diffraction, differential scanning calorimeter, contact angle goniometer, cell cytotoxicity assay, and chick chorioallantoic membrane (CAM) model in the study. When the calcium sulfate dihydrate (CSD) precursor underwent microwave irradiation treatment at temperatures between 100°C and 160°C, the crystal morphologies and crystalline structures were transformed from (tablet-like CSD (monoclinic)) (tablet-like CSD (monoclinic) + long column α-calcium sulfate hemihydrate (α-CSH, hexagonal)) (long column CSD (monoclinic) + short column α-CSH (hexagonal)) (uniform short column α-CSH (hexagonal)). The high-purity α-CSH with uniform short column crystals around 10 μm in length can be synthesized at 160°C for 10 minutes and exhibits a higher hydrophilic feature in blood. Moreover, the cell cytotoxicity assay indicated that the microwave-synthesized samples possessed well biocompatibility. In vivo results also demonstrated that the microwave-synthesized α-CSH not only induces angiogenesis formation but also facilitates osteogenesis. Therefore, the microwave-synthesized α-CSH is a promising bone graft substitute that can be applied in dental and orthopedic fields.

    更新日期:2017-09-07
  • Low temperature ferroelectric behavior in morphotropic Pb(Zr1−xTix)O3
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-05
    J. B. J. Chapman, O. T. Gindele, C. Vecchini, P. Thompson, M. Stewart, M. G. Cain, D. M. Duffy, A. Kimmel

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-05
  • Impact of spark plasma sintering (SPS) on mullite formation in porcelains
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-05
    W. Lerdprom, A. Bhowmik, S. Grasso, E. Zapata-Solvas, D.D. Jayaseelan, M.J. Reece, W.E. Lee

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-05
  • Interaction of a ceria-based anode functional layer with a stabilized zirconia electrolyte: considerations from a materials perspective
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-05
    Christian Lenser, Hyeondeok Jeong, Yoo Jung Sohn, Niklas Russner, Olivier Guillon, Norbert H. Menzler

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-05
  • New calcium-free Na2O-Al2O3-P2O5 bioactive glasses with potential applications in bone tissue engineering
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-05
    Oliwia Jeznach, Marcin Gajc, Karolina Korzeb, Andrzej Kłos, Krzysztof Orliński, Ryszard Stępień, Małgorzata Krok-Borkowicz, Łucja Rumian, Krzysztof Pietryga, Katarzyna Reczyńska, Elżbieta Pamuła, Dorota A. Pawlak

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-05
  • High niobium oxide content in germanate glasses: Thermal, structural and optical properties
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-05
    Lia Mara Marcondes, Sérgio Maestri, Bianca Sousa, Rogeria Rocha Gonçalves, Fabia Castro Cassanjes, Gael Yves Poirier

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-05
  • Effects of Re addition on phase stability and mechanical properties of hexagonal OsB2
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-05
    Ying Long, Canhui Zou, Xin Zheng, Hua-Tay Lin, Fenglin Zhang, Chengyong Wang, Linan An

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-05
  • Synthesis of Eu3+ doped BaBi2Ta2O9 Based Glass-ceramic Nanocomposites: Optical and Dielectric Properties
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-05
    Anirban Chakrabarti, Anal Tarafder, Atiar Rahaman Molla

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-05
  • Synergistically Optimizing Electrical and Thermal Transport Properties of Bi2O2Se Ceramics by Te-substitution
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-04
    Xing Tan, Yaochun Liu, Kerong Hu, Guangkun Ren, Yueming Li, Rui Liu, Yuan-Hua Lin, Jin-Le Lan, Ce-Wen Nan

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-05
  • Compositional effects on the crosslink density of Ca–(Mg)–(Y)–Si–Al–oxyfluoronitride glasses
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-04
    Carolina Clausell, Antonio Barba, Juan Carlos Jarque, Ángel Román García-Bellés, Michael Pomeroy, Stuart Hampshire

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-05
  • Compositional dependence of crystallization in Ge-Sb-Se glasses relevant to optical fiber making
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-04
    H. Parnell, D. Furniss, Z. Tang, N. C. Neate, T. M. Benson, A. B. Seddon

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-05
  • Controllable τf value of barium silicate microwave dielectric ceramics with different Ba/Si ratios
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-04
    Wen Lei, Zheng-Yu Zou, Ze-Hao Chen, Burhan Ullah, Aurang Zeb, Xue-Kai Lan, Wen-Zhong Lu, Gui-Fen Fan, Xiao-Hong Wang, Xiao-Chuan Wang

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-05
  • Structure and physical properties of Ge15Sb20Se65-xSx glasses
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-04
    Rongping Wang, Qin Xu, Haitao Liu, Xinyu Yang

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-05
  • Experimental Phase Equilibria Studies of the PbO-SiO2 System
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-04
    M. Shevchenko, E. Jak

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-05
  • Phase transformations in the relaxor Na1/2Bi1/2TiO3 studied by Means of density functional theory calculations
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-04
    Kai-Christian Meyer, Leonie Koch, Karsten Albe

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    更新日期:2017-09-05
  • Emergence of defect fluorite structure in nano-sized thoria through doping with some divalent transition metal ions
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-04
    Manish Kumar, Vikash Kumar Tripathi, Rajamani Nagarajan

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-05
  • Insights into the Evolution of Carbonate-bearing Kaolin during Sintering revealed by in situ Hyperspectral Raman Imaging
    J. Am. Ceram. Soc. (IF 2.841) Pub Date : 2017-09-04
    Kerstin Stange, Christoph Lenting, Thorsten Geisler

    This article is protected by copyright. All rights reserved.

    更新日期:2017-09-05
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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