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High-entropy ceramics: Present status, challenges, and a look forward J. Adv. Ceram. (IF 2.889) Pub Date : 2021-04-16 Huimin Xiang, Yan Xing, Fu-zhi Dai, Hongjie Wang, Lei Su, Lei Miao, Guojun Zhang, Yiguang Wang, Xiwei Qi, Lei Yao, Hailong Wang, Biao Zhao, Jianqiang Li, Yanchun Zhou
High-entropy ceramics (HECs) are solid solutions of inorganic compounds with one or more Wyckoff sites shared by equal or near-equal atomic ratios of multi-principal elements. Although in the infant stage, the emerging of this new family of materials has brought new opportunities for material design and property tailoring. Distinct from metals, the diversity in crystal structure and electronic structure
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Solvents adjusted pure phase CoCO 3 as anodes for high cycle stability J. Adv. Ceram. (IF 2.889) Pub Date : 2021-04-15 Liming Liu, Xiaoxiao Huang, Zengyan Wei, Xiaoming Duan, Bo Zhong, Long Xia, Tao Zhang, Huatao Wang, Dechang Jia, Yu Zhou, Rui Zhang
CoCO3 with high theoretical capacity has been considered as a candidate anode for the next generation of lithium-ion batteries (LIBs). However, the electrochemical performance of CoCO3 itself, especially the cyclic stability at high current density, hinders its application. Herein, pure phase CoCO3 particles with different particle and pore sizes were prepared by adjusting the solvents (diethylene
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Crystal and electronic structure engineering of tin monoxide by external pressure J. Adv. Ceram. (IF 2.889) Pub Date : 2021-04-15 Kun Li, Junjie Wang, Vladislav A. Blatov, Yutong Gong, Naoto Umezawa, Tomofumi Tada, Hideo Hosono, Artem R. Oganov
Although tin monoxide (SnO) is an interesting compound due to its p-type conductivity, a widespread application of SnO has been limited by its narrow band gap of 0.7 eV. In this work, we theoretically investigate the structural and electronic properties of several SnO phases under high pressures through employing van der Waals (vdW) functionals. Our calculations reveal that a metastable SnO (β-SnO)
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Enhanced electrocaloric effect at room temperature in Mn 2+ doped lead-free (BaSr)TiO 3 ceramics via a direct measurement J. Adv. Ceram. (IF 2.889) Pub Date : 2021-04-15 Xiang Niu, Xiaodong Jian, Xianyi Chen, Haoxuan Li, Wei Liang, Yingbang Yao, Tao Tao, Bo Liang, Sheng-Guo Lu
(Ba1−xSrx)(MnyTi1−y)O3 (BSMT) ceramics with x = 35, 40 mol% and y = 0, 0.1, 0.2, 0.3, 0.4, 0.5 mol% were prepared using a conventional solid-state reaction approach. The dielectric and ferroelectric properties were characterized using impedance analysis and polarization-electric field (P–E) hysteresis loop measurements, respectively. The adiabatic temperature drop was directly measured using a thermocouple
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Microstructure and mechanical properties of Zr 3 Al 3 C 5 -based ceramics synthesized by Al-Si melt infiltration J. Adv. Ceram. (IF 2.889) Pub Date : 2021-04-15 Xiaomeng Fan, Yuzhao Ma, Yangfang Deng, Jinxue Ding, Laifei Cheng
In this work, bulk Zr3Al3C5-based ceramics were synthesized by the infiltration of Al-Si melt into zirconium carbide (ZrC) perform. The phase composition, microstructure, and mechanical properties of as-fabricated ceramics were studied. The results demonstrate that Si is more effective to reduce the twin boundary energy of ZrC than Al, and thus promotes the decrease of formation temperature of Zr3Al3C5
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Efficient oxygen reduction reaction by a highly porous, nitrogen-doped carbon sphere electrocatalyst through space confinement effect in nanopores J. Adv. Ceram. (IF 2.889) Pub Date : 2021-04-08 Zheyang Mo, Weiyi Yang, Shuang Gao, Jian Ku Shang, Yajun Ding, Wuzhu Sun, Qi Li
A highly porous nitrogen-doped carbon sphere (NPC) electrocatalyst was prepared through the carbonization of biomass carbon spheres mixed with urea and zinc chloride in N2 atmosphere. The sample carbonized at 1000 °C demonstrates a superior oxygen reduction reaction (ORR) performance over the Pt/C electrocatalyst, while its contents of pyridinic nitrogen and graphitic nitrogen are the lowest among
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High-temperature oxidation behavior of SiBN fibers in air J. Adv. Ceram. (IF 2.889) Pub Date : 2021-03-29 Xin Long, Zhenyu Wu, Changwei Shao, Xiaozhou Wang, Yingde Wang
SiBN fibers are one of the most admirable microwave-transparent reinforced materials for high Mach number aircrafts. Currently, the detailed high-temperature oxidation behavior of SiBN fibers has not been studied yet. In this work, we studied the high-temperature oxidation behavior of SiBN fibers with different boron contents at the temperature range of 1000–1400 °C in air. SiBN fibers started to be
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Photopolymerization-based additive manufacturing of ceramics: A systematic review J. Adv. Ceram. (IF 2.889) Pub Date : 2021-03-27 Sefiu Abolaji Rasaki, Dingyu Xiong, Shufeng Xiong, Fang Su, Muhammad Idrees, Zhangwei Chen
Conversion of inorganic-organic frameworks (ceramic precursors and ceramic-polymer mixtures) into solid mass ceramic structures based on photopolymerization process is currently receiving plentiful attention in the field of additive manufacturing (3D printing). Various techniques (e.g., stereolithography, digital light processing, and two-photon polymerization) that are compatible with this strategy
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Microstructural evolution of h-BN matrix composite ceramics with La-Al-Si-O glass phase during hot-pressed sintering J. Adv. Ceram. (IF 2.889) Pub Date : 2021-03-24 Baofu Qiu, Xiaoming Duan, Zhuo Zhang, Chen Zhao, Bo Niu, Peigang He, Delong Cai, Lei Chen, Zhihua Yang, Yujin Wang, Dechang Jia, Yu Zhou
BN/La-Al-Si-O composite ceramics were fabricated by hot-pressed sintering using hexagonal boron nitride (h-BN), lanthanum oxide (La2O3), aluminia (Al2O3), and amorphous silica (SiO2) as the raw materials. The effects of sintering temperature on microstructural evolution, bulk density, apparent porosity, and mechanical properties of the h-BN composite ceramics were investigated. The results indicated
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Annealing effects on the optical and electrochemical properties of tantalum pentoxide films J. Adv. Ceram. (IF 2.889) Pub Date : 2021-03-21 Wei Ren, Guang-Dao Yang, Ai-Ling Feng, Rui-Xia Miao, Jun-Bo Xia, Yong-Gang Wang
Tantalum pentoxide (Ta2O5) has attracted intensive attention due to their excellent physicochemical properties. Ta2O5 films were synthesized via electron beam evaporation (EBE) and subsequently annealed at different temperatures ranging from 300 to 900 °C. X-ray diffraction (XRD) results show that amorphous Ta2O5 thin films form from 300 to 700 °C and then a phase transition to polycrystalline β-Ta2O5
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Experimental and numerical investigation on the thermal and mechanical behaviours of thermal barrier coatings exposed to CMAS corrosion J. Adv. Ceram. (IF 2.889) Pub Date : 2021-03-10 Dongxu Li, Peng Jiang, Renheng Gao, Fan Sun, Xiaochao Jin, Xueling Fan
Calcium-magnesium-alumino-silicate (CMAS) corrosion is a critical factor which causes the failure of thermal barrier coating (TBC). CMAS attack significantly alters the temperature and stress fields in TBC, resulting in their delamination or spallation. In this work, the evolution process of TBC prepared by suspension plasma spraying (SPS) under CMAS attack is investigated. The CMAS corrosion leads
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Boosting energy storage performance of low-temperature sputtered CaBi 2 Nb 2 O 9 thin film capacitors via rapid thermal annealing J. Adv. Ceram. (IF 2.889) Pub Date : 2021-03-05 Jing Yan, Yanling Wang, Chun-Ming Wang, Jun Ouyang
CaBi2Nb2O9 thin film capacitors were fabricated on SrRuO3-buffered Pt(111)/Ti/Si(100) substrates by adopting a two-step fabrication process. This process combines a low-temperature sputtering deposition with a rapid thermal annealing (RTA) to inhibit the grain growth, for the purposes of delaying the polarization saturation and reducing the ferroelectric hysteresis. By using this method, CaBi2Nb2O9
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Improved performances of lithium disilicate glass-ceramics by seed induced crystallization J. Adv. Ceram. (IF 2.889) Pub Date : 2021-03-03 Ting Zhao, Mei-Mei Lian, Yi Qin, Jian-Feng Zhu, Xin-Gang Kong, Jian-Feng Yang
Self-reinforced lithium disilicate (Li2Si2O5, LD) glass-ceramics were hot pressing sintered by introducing 5 wt% Li2Si2O5 crystal seeds into two different glass compositions of SiO2-Li2O-P2O5-ZrO2-Al2O3-K2O-La2O3 (7C LD) and SiO2-Li2O-K2O-La2O3 (4C LD). The results show that the seeds play an important role in the crystallization inducement, and microstructural and property improvement of the glass
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Effects of surface roughness on CMAS corrosion behavior for thermal barrier coating applications J. Adv. Ceram. (IF 2.889) Pub Date : 2021-03-01 Lei Guo, Guang Li, Zhilin Gan
Calcium-magnesium-alumina-silicate (CMAS) corrosion is an important cause for thermal barrier coating (TBC) failure, which has attracted increased attentions. In this study, some thermal barrier coating (TBC) materials including YSZ (yttria partially stabilized zirconia), GdPO4, and LaPO4 were prepared into bulks, and the effects of their surface roughness on wettability and spreading characteristics
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Preparation and properties of CMAS resistant bixbyite structured high-entropy oxides RE 2 O 3 (RE = Sm, Eu, Er, Lu, Y, and Yb): Promising environmental barrier coating materials for Al 2 O 3f /Al 2 O 3 composites J. Adv. Ceram. (IF 2.889) Pub Date : 2021-03-01 Yanan Sun, Huimin Xiang, Fu-Zhi Dai, Xiaohui Wang, Yan Xing, Xiaojun Zhao, Yanchun Zhou
Y2O3 is regarded as one of the potential environmental barrier coating (EBC) materials for Al2O3f/Al2O3 ceramic matrix composites owing to its high melting point and close thermal expansion coefficient to Al2O3. However, the relatively high thermal conductivity and unsatisfactory calcium-magnesium-aluminosilicate (CMAS) resistance are the main obstacles for the practical application of Y2O3. In order
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High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite as attenuating agent J. Adv. Ceram. (IF 2.889) Pub Date : 2021-03-01 Xia Fang, Lei Jiang, Limei Pan, Shuang Yin, Tai Qiu, Jian Yang
High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite (SG) as the attenuating agent were fabricated through hot-pressing sintering. The SG maintains its three-dimensional (3D) morphology within the sintered bodies, which considerably impedes the sintering of the composites to some extent but slightly influences on the growth of AlN grains. The addition
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Hydrous cerium oxides coated glass fiber for efficient and long-lasting arsenic removal from drinking water J. Adv. Ceram. (IF 2.889) Pub Date : 2021-03-01 Ronghui Li, Weiyi Yang, Shuang Gao, Jianku Shang, Qi Li
A novel arsenic adsorbent with hydrous cerium oxides coated on glass fiber cloth (HCO/GFC) was synthesized. The HCO/GFC adsorbents were rolled into a cartridge for arsenic removal test. Due to the large pores between the glass fibers, the arsenic polluted water can flow through easily. The arsenic removal performance was evaluated by testing the equilibrium adsorption isotherm, adsorption kinetics
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Enhanced aging and thermal shock performance of Mn 1.95−x CO 0.21 Ni 0.84 Sr x O 4 NTC ceramics J. Adv. Ceram. (IF 2.889) Pub Date : 2021-02-27 Haibing Li, Huimin Zhang, Slapley Thayil, Aimin Chang, Xu Sang, Xiuhua Ma
The Mn1.95−xCo0.21Ni0.84SrxO4 (MCNS) (0 ≼ x ≼ 0.15) based negative temperature coefficient (NTC) materials are prepared by co-precipitation method. The replacement of Mn by Sr plays a critical role in controlling the lattice parameter, relative density, microstructure, and electrical properties. The lattice parameter and relative density increase with the increase of Sr content. A small amount of Sr
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Effect of pyrolytic carbon interphase on mechanical properties of mini T800-C/SiC composites J. Adv. Ceram. (IF 2.889) Pub Date : 2021-02-27 Donglin Zhao, Tong Guo, Xiaomeng Fan, Chao Chen, Yue Ma
The effect of pyrolytic carbon (PyC) thickness on the tensile property of mini T800 carbon fiber reinforced SiC matrix composites (C/SiC) was studied. PyC interphase was prepared by chemical vapor infiltration (CVI) process using C3H6–Ar as gas source, the PyC thickness was adjusted from 0 to 400 nm, and then the SiC matrix was prepared by CVI process using methyltrichlorosilane (MTS)–H2–Ar as precursor
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Fabrication and performance evaluation of novel transparent ceramics RE:Tb 3 Ga 5 O 12 (RE = Pr, Tm, Dy) toward magneto-optical application J. Adv. Ceram. (IF 2.889) Pub Date : 2021-02-24 Xiaoying Li, Ilya L. Snetkov, Aleksey Yakovlev, Qiang Liu, Xin Liu, Ziyu Liu, Penghui Chen, Danyang Zhu, Lexiang Wu, Zhaoxiang Yang, Tengfei Xie, Haohong Chen, Oleg Palashov, Jiang Li
Transparent ceramics are at the heart of modern magneto-optical materials providing promising opportunities for Faraday isolators. 1.0 at% RE:Tb3Ga5O12 (rare earth (RE) = Pr, Tm, Dy) transparent ceramics were successfully prepared by air sintering and sequential HIP technique using the coprecipitated powders as the raw material. All the powders have shown to be a pure cubic terbium gallium garnet (TGG)
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Electric modulation of conduction in MAPbBr 3 single crystals J. Adv. Ceram. (IF 2.889) Pub Date : 2021-02-24 Shanming Ke, Shangyu Luo, Jinhui Gong, Liwen Qiu, Renhong Liang, Yangbo Zhou, Bingcheng Luo, Baochang Cheng, Li Wang, Longlong Shu
The resistive switching (RS) mechanism of hybrid organic-inorganic perovskites has not been clearly understood until now. A switchable diode-like RS behavior in MAPbBr3 single crystals using Au (or Pt) symmetric electrodes is reported. Both the high resistance state (HRS) and low resistance state (LRS) are electrode-area dependent and light responsive. We propose an electric-field-driven inner p-n
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Evolution of electromechanical properties in Fe-doped (Pb,Sr)(Zr,Ti)O 3 piezoceramics J. Adv. Ceram. (IF 2.889) Pub Date : 2021-02-24 Chuan Chen, Yan Wang, Zong-Yue Li, Chun Liu, Wen Gong, Qing Tan, Bing Han, Fang-Zhou Yao, Ke Wang
Defects in acceptor-doped perovskite piezoelectric materials have a significant impact on their electrical properties. Herein, the defect mediated evolution of piezoelectric and ferroelectric properties of Fe-doped (Pb,Sr)(Zr,Ti)O3 (PSZT-Fe) piezoceramics with different treatments, including quenching, aging, de-aging, and poling, was investigated systematically. Oxygen vacancies with a cubic symmetry
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Synthesis of nearly spherical AlN particles by an in-situ nitriding combustion route J. Adv. Ceram. (IF 2.889) Pub Date : 2021-02-24 Zhilei Wei, Kang Li, Bangzhi Ge, Chaowei Guo, Hongyan Xia, Yajie Guo, Zhongqi Shi
Spherical AlN powders with micrometer size have attracted great attention owing to their good fluidity and dispersity. However, the industrial preparation methods usually require high temperature and long soaking time, which lead to the high cost and limit the wide application of the products. Herein, nearly spherical AlN particles with the average size of 2.5 µm were successfully synthesized via an
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IR-transparent MgO-Gd 2 O 3 composite ceramics produced by self-propagating high-temperature synthesis and spark plasma sintering J. Adv. Ceram. (IF 2.889) Pub Date : 2021-02-10 Dmitry A. Permin, Maksim S. Boldin, Alexander V. Belyaev, Stanislav S. Balabanov, Vitaly A. Koshkin, Atrem A. Murashov, Igor V. Ladenkov, Evgeny A. Lantsev, Ksenia E. Smetanina, Nadia M. Khamaletdinova
A glycine-nitrate self-propagating high-temperature synthesis (SHS) was developed to produce composite MgO-Gd2O3 nanopowders. The X-ray powder diffraction (XRD) analysis confirmed the SHS-product consists of cubic MgO and Gd2O3 phases with nanometer crystallite size and retains this structure after annealing at temperatures up to 1200 °C. Near full dense high IR-transparent composite ceramics were
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Post-illumination activity of Bi 2 WO 6 in the dark from the photocatalytic “memory” effect J. Adv. Ceram. (IF 2.889) Pub Date : 2021-02-10 Weiyi Yang, Yan Chen, Shuang Gao, Licheng Sang, Ruoge Tao, Caixia Sun, Jian Ku Shang, Qi Li
Photocatalysts with the photocatalytic “memory” effect could resolve the intrinsic activity loss of traditional photocatalysts when the light illumination is turned off. Due to the dual requirements of light absorption and energy storage/release functions, most previously reported photocatalysts with the photocatalytic “memory” effect were composite photocatalysts of two phase components, which may
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Effect of mass transfer channels on flexural strength of C/SiC composites fabricated by femtosecond laser assisted CVI method with optimized laser power J. Adv. Ceram. (IF 2.889) Pub Date : 2021-02-10 Jing Wang, Liyang Cao, Yunhai Zhang, Yongsheng Liu, Hui Fang, Jie Chen
In this study, femtosecond laser assisted-chemical vapor infiltration (LA-CVI) was employed to produce C/SiC composites with 1, 3, and 5 rows of mass transfer channels. The effect of laser machining power on the quality of produced holes was investigated. The results showed that the increase in power yielded complete hole structures. The as-obtained C/SiC composites with different mass transfer channels
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Additive manufacturing of thin electrolyte layers via inkjet printing of highly-stable ceramic inks J. Adv. Ceram. (IF 2.889) Pub Date : 2021-02-10 Zhongqi Zhu, Zhiyuan Gong, Piao Qu, Ziyong Li, Sefiu Abolaji Rasaki, Zhiyuan Liu, Pei Wang, Changyong Liu, Changshi Lao, Zhangwei Chen
Inkjet printing is a promising alternative for the fabrication of thin film components for solid oxide fuel cells (SOFCs) due to its contactless, mask free, and controllable printing process. In order to obtain satisfying electrolyte thin layer structures in anode-supported SOFCs, the preparation of suitable electrolyte ceramic inks is a key. At present, such a kind of 8 mol% Y2O3-stabilized ZrO2 (8YSZ)
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Electrochemical performance of La 2 NiO 4+δ -Ce 0.55 La 0.45 O 2−δ as a promising bifunctional oxygen electrode for reversible solid oxide cells J. Adv. Ceram. (IF 2.889) Pub Date : 2021-02-06 Pengzhang Li, Wei Yang, Chuanjin Tian, Wenyan Zhao, Zhe Lü, Zhipeng Xie, Chang-An Wang
In this work, La2NiO4+δ-xCe0.55La0.45O2−δ (denoted as LNO-xLDC) with various LDC contents (x = 0, 10, 20, 30, and 40 wt%) were prepared and evaluated as bifunctional oxygen electrodes for reversible solid oxide cells (RSOCs). Compared with the pure LNO, the optimum composition of LNO-30LDC exhibited the lowest polarization resistance (Rp) of 0.53 and 0.12 Ω·cm2 in air at 650 and 750 °C, respectively
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Structural evolution of plasma sprayed amorphous Li 4 Ti 5 O 12 electrode and ceramic/polymer composite electrolyte during electrochemical cycle of quasi-solid-state lithium battery J. Adv. Ceram. (IF 2.889) Pub Date : 2021-02-06 Xi Wu, Xinghua Liang, Xiaofeng Zhang, Lingxiao Lan, Suo Li, Qixin Gai
A quasi-solid-state lithium battery is assembled by plasma sprayed amorphous Li4Ti5O12 (LTO) electrode and ceramic/polymer composite electrolyte with a little liquid electrolyte (10 µL/cm2) to provide the outstanding electrochemical stability and better normal interface contact. Scanning Electron Microscope (SEM), Scanning Transmission Electron Microscopy (STEM), Transmission Electron Microscopy (TEM)
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Freeze-drying and hot-pressing strategy to embed two-dimensional Ti 0.87 O 2 monolayers in commercial polypropylene films with enhanced dielectric properties J. Adv. Ceram. (IF 2.889) Pub Date : 2021-02-05 Wenchao Tian, Fei Yan, Cailing Cai, Zeyi Wu, Chenchen Zhang, Ting Yin, Sijia Lao, Linfeng Hu
The dielectric capacitor has been widely used in advanced electronic and electrical power systems due to its capability of ultrafast charging-discharging and ultrahigh power density. Nevertheless, its energy density is still limited by the low dielectric constant(≈ 2.2) of the commercial dielectric polypropylene (PP). The conventional enhancement strategy by embedding inorganic fillers in PP matrix
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Enhanced pyrocatalysis of the pyroelectric BiFeO 3 /g-C 3 N 4 heterostructure for dye decomposition driven by cold-hot temperature alternation J. Adv. Ceram. (IF 2.889) Pub Date : 2021-02-05 Mingzi Chen, Yanmin Jia, Huamei Li, Zheng Wu, Tianyin Huang, Hongfang Zhang
The BiFeO3/g-C3N4 heterostructure, which is fabricated via a simple mixing-calcining method, benefits the significant enhancement of the pyrocatalytic performance. With the growth of g-C3N4 content in the heterostructure pyrocatalysts from 0 to 25%, the decomposition ratio of Rhodamine B (RhB) dye after 18 cold-hot temperature fluctuation (25–65 °C) cycles increases at first and then decreases, reaching
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Dense ceramics with complex shape fabricated by 3D printing: A review J. Adv. Ceram. (IF 2.889) Pub Date : 2021-02-05 Zhe Chen, Xiaohong Sun, Yunpeng Shang, Kunzhou Xiong, Zhongkai Xu, Ruisong Guo, Shu Cai, Chunming Zheng
Three-dimensional (3D) printing technology is becoming a promising method for fabricating highly complex ceramics owing to the arbitrary design and the infinite combination of materials. Insufficient density is one of the main problems with 3D printed ceramics, but concentrated descriptions of making dense ceramics are scarce. This review specifically introduces the principles of the four 3D printing
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Electrical and thermal transport behaviours of high-entropy perovskite thermoelectric oxides J. Adv. Ceram. (IF 2.889) Pub Date : 2021-01-29 Yunpeng Zheng, Mingchu Zou, Wenyu Zhang, Di Yi, Jinle Lan, Ce-Wen Nan, Yuan-Hua Lin
Oxide-based ceramics could be promising thermoelectric materials because of their thermal and chemical stability at high temperature. However, their mediocre electrical conductivity or high thermal conductivity is still a challenge for the use in commercial devices. Here, we report significantly suppressed thermal conductivity in SrTiO3-based thermoelectric ceramics via high-entropy strategy for the
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Experimental and FEM based investigation of the influence of the deposition temperature on the mechanical properties of SiC coatings J. Adv. Ceram. (IF 2.889) Pub Date : 2021-01-18 Thomas Schlech, Siegfried Horn, Charles Wijayawardhana, Arash Rashidi
Scanning electron microscopy shows that the microstructure, in particular the overall grain size, of chemical vapor deposited silicon carbide coatings depends on the deposition temperature. So far, the influence of the microstructure on the mechanical properties of such coatings is not well described in literature. To investigate the influence of the deposition temperature on the mechanical properties
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Formation of hierarchical Si 3 N 4 foams by protein-based gelcasting and chemical vapor infiltration J. Adv. Ceram. (IF 2.889) Pub Date : 2021-01-18 Junsheng Li, Qiuping Yu, Duan Li, Liang Zeng, Shitao Gao
Silicon nitride foams with a hierarchical porous structure was formed by the combination of protein-based gelcasting, chemical vapor infiltration, and in-situ growth of silicon nitride nanowires. The porosity of the foams can be controlled at 76.3–83.8 vol% with an open porosity of 70.2– 82.8 vol%. The pore size distribution was presented in three levels: < 2 μm (voids among grains and cross overlapping
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Effect of processing parameters on in situ screen printing-assisted synthesis and electrical properties of Ti 3 SiC 2 -based structures J. Adv. Ceram. (IF 2.889) Pub Date : 2021-01-18 Mylena Lorenz, Nahum Travitzky, Carlos R. Rambo
This work reports on the development of pastes containing Ti, TiC, Si, and C elementary powders for in situ synthesis of Ti3SiC2 via screen printing. Four paste compositions were manufactured using two powder mixtures (Ti/Si/C and Ti/TiC/Si/C) with different stoichiometry. The pastes were screen printed onto Al2O3 substrates and sintered at 1400 ℃ in argon varying the dwell time from 1 to 5 h. The
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High performance hydroxyapatite ceramics and a triply periodic minimum surface structure fabricated by digital light processing 3D printing J. Adv. Ceram. (IF 2.889) Pub Date : 2021-01-18 Yongxia Yao, Wei Qin, Bohang Xing, Na Sha, Ting Jiao, Zhe Zhao
High performance hydroxyapatite (HA) ceramics with excellent densification and mechanical properties were successfully fabricated by digital light processing (DLP) three-dimensional (3D) printing technology. It was found that the sintering atmosphere of wet CO2 can dramatically improve the densification process and thus lead to better mechanical properties. HA ceramics with a relative density of 97
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Micro-fabrication of ceramics: Additive manufacturing and conventional technologies J. Adv. Ceram. (IF 2.889) Pub Date : 2021-01-18 Hany Hassanin, Khamis Essa, Amr Elshaer, Mohamed Imbaby, Heba H. El-Mongy, Tamer A. El-Sayed
Ceramic materials are increasingly used in micro-electro-mechanical systems (MEMS) as they offer many advantages such as high-temperature resistance, high wear resistance, low density, and favourable mechanical and chemical properties at elevated temperature. However, with the emerging of additive manufacturing, the use of ceramics for functional and structural MEMS raises new opportunities and challenges
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Electrical transport in lead-free Na 0.5 Bi 0.5 TiO 3 ceramics J. Adv. Ceram. (IF 2.889) Pub Date : 2021-01-18 J. Suchanicz, K. Kluczewska-Chmielarz, D. Sitko, G. Jagło
Lead-free Na0.5Bi0.5TiO3 (NBT) ceramics were prepared via a conventional oxide-mixed sintering route and their electrical transport properties were investigated. Direct current (DC, σDC) and alternating current (AC, σAC) electrical conductivity values, polarization current (first measurements) and depolarization current, current–voltage (I–U) characteristics (first measurements), and the Seebeck coefficient
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Size and temperature effects on dielectric breakdown of ferroelectric films J. Adv. Ceram. (IF 2.889) Pub Date : 2021-01-18 Sheng Tong
The paper introduces a model of dielectric breakdown strength. The model integrated thermal breakdown and defect models, representing the relationship between the electric field of ferroelectric films and dimensional parameters and operating temperature. This model is verified with experimental results of the lead lanthanum zirconate titanate (PLZT) films of various film thickness (d = 0.8–3 μm), electrode
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Synthesis, microstructure, and properties of high purity Mo 2 TiAlC 2 ceramics fabricated by spark plasma sintering J. Adv. Ceram. (IF 2.889) Pub Date : 2020-12-23 Yunhui Niu, Shuai Fu, Kuibao Zhang, Bo Dai, Haibin Zhang, Salvatore Grasso, Chunfeng Hu
The synthesis, microstructure, and properties of high purity dense bulk Mo2TiAlC2 ceramics were studied. High purity Mo2TiAlC2 powder was synthesized at 1873 K starting from Mo, Ti, Al, and graphite powders with a molar ratio of 2:1:1.25:2. The synthesis mechanism of Mo2TiAlC2 was explored by analyzing the compositions of samples sintered at different temperatures. It was found that the Mo2TiAlC2 phase
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A new class of high-entropy M 3 B 4 borides J. Adv. Ceram. (IF 2.889) Pub Date : 2020-12-08 Mingde Qin, Qizhang Yan, Yi Liu, Jian Luo
A new class of high-entropy M3B4 borides of the Ta3B4-prototyped orthorhombic structure has been synthesized in the bulk form for the first time. Specimens with compositions of (V0.2Cr0.2Nb0.2Mo0.2Ta0.2)3B4 and (V0.2Cr0.2Nb0.2Ta0.2W0.2)3B4 were fabricated via reactive spark plasma sintering of high-energy-ball-milled elemental boron and metal precursors. The sintered specimens were ∼98.7% in relative
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Novel optical properties and induced magnetic moments in Ru-doped hybrid improper ferroelectric Ca 3 Ti 2 O 7 J. Adv. Ceram. (IF 2.889) Pub Date : 2020-11-28 Xingxing Wu, Shouyu Wang, Winnie Wong-Ng, Qiang Gu, Yao Jiang, Chao Wang, Shuang Ma, Weifang Liu
Hybrid improper ferroelectric Ca3Ti2O7 and Ca3Ti19Ru0.1O7 ceramics were successfully synthesized by conventional solid-state reaction method. Two strongest diffraction peaks located around 2θ = 33° shifted towards the lower angle region with Ru substitution, reflecting structure variation. Grain growth and higher oxygen vacancy concentration after doping resulted in a reduction in the coercive field
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Microstructural evolution and mechanical properties of in situ nano Ta 4 HfC 5 reinforced SiBCN composite ceramics J. Adv. Ceram. (IF 2.889) Pub Date : 2020-11-27 Bingzhu Wang, Daxin Li, Zhihua Yang, Dechang Jia, Jingyi Guan, Hao Peng, Delong Cai, Peigang He, Xiaoming Duan, Yu Zhou, Tao Zhang, Chenguang Gao
The in situ nano Ta4HfC5 reinforced SiBCN-Ta4HfC5 composite ceramics were prepared by a combination of two-step mechanical alloying and reactive hot-pressing sintering. The microstructural evolution and mechanical properties of the resulting SiBCN-Ta4HfC5 were studied. After the first-step milling of 30 h, the raw materials of TaC and HfC underwent crushing, cold sintering, and short-range interdiffusion
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Thermoelectric performance enhancement by manipulation of Sr/Ti doping in two sublayers of Ca 3 Co 4 O 9 J. Adv. Ceram. (IF 2.889) Pub Date : 2020-11-27 Li Zhang, Yichen Liu, Thiam Teck Tan, Yi Liu, Jian Zheng, Yanling Yang, Xiaojiang Hou, Lei Feng, Guoquan Suo, Xiaohui Ye, Sean Li
Thermoelectric (TE) performance of Ca3Co4O9 (CCO) has been investigated extensively via a doping strategy in the past decades. However, the doping sites of different sublayers in CCO and their contributions to the TE performance remain unrevealed because of its strong correlated electronic system. In this work, Sr and Ti are chosen to realize doping at the [Ca2CoO3] and [CoO2] sublayers in CCO. It
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Surface-modified Zn 0.5 Ti 0.5 NbO 4 particles filled polytetrafluoroethylene composite with extremely low dielectric loss and stable temperature dependence J. Adv. Ceram. (IF 2.889) Pub Date : 2020-11-27 Hao Wang, Fuming Zhou, Jianming Guo, Yuanyuan Zhang, Hui Yang, Qilong Zhang
Polymer-ceramic composites are widely applied in microwave substrate materials due to the excellent dielectric properties and simple preparation process recently. Polytetrafluoroethylene-based (PTFE) composites filled with Zn0.5Ti0.5NbO4 (ZTN) ceramic particles were fabricated by hot-pressing. The particles were modified by C14H19F13O3Si to enhance the interface compatibility between PTFE and ZTN powders
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A low-firing melilite ceramic Ba 2 CuGe 2 O 7 and compositional modulation on microwave dielectric properties through Mg substitution J. Adv. Ceram. (IF 2.889) Pub Date : 2020-11-25 Changzhi Yin, Zezong Yu, Longlong Shu, Laijun Liu, Yan Chen, Chunchun Li
A melilite Ba2CuGe2O7 ceramic was characterized by low sintering temperature and moderate microwave dielectric properties. Sintered at 960 °C, the Ba2CuGe2O7 ceramic had a high relative density 97%, a low relative permittivity (εr) 9.43, a quality factor (Q×f) of 20,000 GHz, and a temperature coefficient of resonance frequency (τf) −76 ppm/°C. To get a deep understanding of the relationship between
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Microstructure and mechanical properties of 3D C f /SiBCN composites fabricated by polymer infiltration and pyrolysis J. Adv. Ceram. (IF 2.889) Pub Date : 2020-11-24 Bowen Chen, Qi Ding, Dewei Ni, Hongda Wang, Yusheng Ding, Xiangyu Zhang, Shaoming Dong
In this work, three-dimensional (3D) Cf/SiBCN composites were fabricated by polymer infiltration and pyrolysis (PIP) with poly(methylvinyl)borosilazane as SiBCN precursor. The 3D microstructure evolution process of the composites was investigated by an advanced X-ray computed tomography (XCT). The effect of dicumyl peroxide (DCP) initiator addition on the crosslinking process, microstructure evolution
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Synthesis and electrochemical properties of V 2 C MXene by etching in opened/closed environments J. Adv. Ceram. (IF 2.889) Pub Date : 2020-11-15 Meng Wu, Yan He, Libo Wang, Qixun Xia, Aiguo Zhou
The effect of etching environment (opened or closed) on the synthesis and electrochemical properties of V2C MXene was studied. V2C MXene samples were synthesized by selectively etching of V2AlC at 90 °C in two different environments: opened environment (OE) in oil bath pans under atmosphere pressure and closed environment (CE) in hydrothermal reaction kettles under higher pressures. In OE, only NaF
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Microstructure and mechanical properties of Ti 3 (Al,Ga)C 2 /Al 2 O 3 composites prepared by in situ reactive hot pressing J. Adv. Ceram. (IF 2.889) Pub Date : 2020-11-13 Yuan Fang, Xiaohua Liu, Yuxia Feng, Jianfeng Zhu, Wei Jiang
In this study, Ti3(Al,Ga)C2/Al2O3 composites were successfully synthesized by in situ hot pressing at 1350 °C for 2 h using Ti, Al, TiC, and Ga2O3 as raw materials. X-ray diffraction and scanning electron microscopy were used for characterizing the phase identities and microstructures of the sintered composites. The dependence of the Vickers hardness and flexural strength on the Al2O3 content was found
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Deep-red emitting Mg 2 TiO 4 :Mn 4+ phosphor ceramics for plant lighting J. Adv. Ceram. (IF 2.889) Pub Date : 2020-11-09 Zixin Wang, Hui Lin, Dawei Zhang, Yiming Shen, Yang Li, Ruijin Hong, Chunxian Tao, Zhaoxia Han, Lei Chen, Shengming Zhou
In this study, deep-red emitting Mg2TiO4:Mn4+ phosphor ceramics were synthesized by the high temperature solid-state reaction method. The ceramics can be excited by the 465 nm blue light and had a narrow emission with a full width at half maximum (FWMH) value of 31 nm. The peak wavelength was located at 658 nm, which matched the demanded wavelength for photosynthesis. The crystal field strength (Dq)
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Microstructure and mechanical properties of short-carbon-fiber/Ti 3 SiC 2 composites J. Adv. Ceram. (IF 2.889) Pub Date : 2020-11-06 Guangqi He, Rongxiu Guo, Meishuan Li, Yang Yang, Linshan Wang, Yuhai Qian, Jun Zuo, Jingjun Xu, Changsheng Liu
Short-carbon-fibers (Csf) reinforced Ti3SiC2 matrix composites (Csf/Ti3SiC2, the Csf content was 0 vol%, 2 vol%, 5 vol%, and 10 vol%) were fabricated by spark plasma sintering (SPS) using Ti3SiC2 powders and Csf as starting materials at 1300 °C. The effects of Csf addition on the phase compositions, microstructures, and mechanical properties (including hardness, flexural strength (σf), and KIC) of
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Fabrication, microstructures, and optical properties of Yb:Lu 2 O 3 laser ceramics from co-precipitated nano-powders J. Adv. Ceram. (IF 2.889) Pub Date : 2020-11-06 Ziyu Liu, Guido Toci, Angela Pirri, Barbara Patrizi, Yagang Feng, Jiabei Wei, Feng Wu, Zhaoxiang Yang, Matteo Vannini, Jiang Li
The Yb:Lu2O3 precursor made up of spherical particles was synthesized through the co-precipitation method in the water/ethanol solvent. The 5 at% Yb:Lu2O3 powder is in the cubic phase after calcination at 1100 °C for 4 h. The powder also consists of spherical nanoparticles with the average particle and grain sizes of 96 and 49 nm, respectively. The average grain size of the pre-sintered ceramic sample
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Enhanced dielectric, ferroelectric, and optical properties in rare earth elements doped PMN-PT thin films J. Adv. Ceram. (IF 2.889) Pub Date : 2020-11-05 Shun Zhou, Dabin Lin, Yongming Su, Lin Zhang, Weiguo Liu
Rare earth (RE = La3+, Sm3+, Pr3+) ion doped Pb(Mg1/3Nb2/3)O3-PbTiO3 (RE-PMN-PT) ferroelectric thin films with compositions near the morphotropic phase boundary were grown on the Pt/TiO2/SiO2/Si(100) substrate using sol-gel/spin coating method. The phase structure, electrical properties, and photoluminescence performance of thin films were investigated systematically. The highly (100)-preferred orientation
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One-step synthesis and electromagnetic absorption properties of high entropy rare earth hexaborides (HE REB 6 ) and high entropy rare earth hexaborides/borates (HE REB 6 /HE REBO 3 ) composite powders J. Adv. Ceram. (IF 2.889) Pub Date : 2020-10-21 Weiming Zhang, Biao Zhao, Huimin Xiang, Fu-Zhi Dai, Shijiang Wu, Yanchun Zhou
Considering the emergence of severe electromagnetic interference problems, it is vital to develop electromagnetic (EM) wave absorbing materials with high dielectric, magnetic loss and optimized impedance matching. However, realizing the synergistic dielectric and magnetic losses in a single phase material is still a challenge. Herein, high entropy (HE) rare earth hexaborides (REB6) powders with coupling
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Optimal preparation of high-entropy boride-silicon carbide ceramics J. Adv. Ceram. (IF 2.889) Pub Date : 2020-10-21 Yan Zhang, Shi-Kuan Sun, Wei-Ming Guo, Liang Xu, Wei Zhang, Hua-Tay Lin
High-entropy boride-silicon carbide (HEB-SiC) ceramics were fabricated using boride-based powders prepared from borothermal and boro/carbothermal reduction methods. The effects of processing routes (borothermal reduction and boro/carbothermal reduction) on the HEB powders were examined. HEB-SiC ceramics with > 98% theoretical density were prepared by spark plasma sintering at 2000 °C. It was demonstrated
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Preparation of hollow fiber membranes from mullite particles with aid of sintering additives J. Adv. Ceram. (IF 2.889) Pub Date : 2020-10-21 Hua Liu, Jinyun Liu, Zhou Hong, Shengxian Wang, Xuechao Gao, Xuehong Gu
Porous mullite hollow fiber membranes were prepared with a combined phase-inversion and sintering method, using three sintering additives including yttrium stabilized zirconia (YSZ), small mullite particles (SMP), and titanium oxide (TiO2) to promote the particle sintering. The results indicated that all the three additives could improve the sintering performance of mullite hollow fiber membranes due
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Development of calcium stabilized nitrogen rich α-sialon ceramics along the Si 3 N 4 :1/2Ca 3 N 2 :3AlN line using spark plasma sintering J. Adv. Ceram. (IF 2.889) Pub Date : 2020-10-10 B. A. Ahmed, T. Laoui, A. S. Hakeem
Calcium stabilized nitrogen rich sialon ceramics having a general formula of CaxSi12-2xAl2xN16 with x value (x is the solubility of cation Ca in α-sialon structure) in the range of 0.2–2.2 for compositions lying along the Si3N4:1/2Ca3N2:3AlN line were synthesized using nano/submicron size starting powder precursors and spark plasma sintering (SPS) technique. The development of calcium stabilized nitrogen
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High-entropy (Nd 0.2 Sm 0.2 Eu 0.2 Y 0.2 Yb 0.2 ) 4 Al 2 O 9 with good high temperature stability, low thermal conductivity, and anisotropic thermal expansivity J. Adv. Ceram. (IF 2.889) Pub Date : 2020-10-10 Zifan Zhao, Huimin Xiang, Heng Chen, Fu-Zhi Dai, Xiaohui Wang, Zhijian Peng, Yanchun Zhou
The critical requirements for the environmental barrier coating (EBC) materials of silicon-based ceramic matrix composites (CMCs) include good tolerance to harsh environments, thermal expansion matches with the interlayer mullite, good high-temperature phase stability, and low thermal conductivity. Cuspidine-structured rare-earth aluminates RE4Al2O9 have been considered as candidates of EBCs for their
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Role of in-situ formed free carbon on electromagnetic absorption properties of polymer-derived SiC ceramics J. Adv. Ceram. (IF 2.889) Pub Date : 2020-10-10 Zhaoju Yu, Xuan Lv, Kangwei Mao, Yujing Yang, Anhua Liu
In order to enhance dielectric properties of polymer-derived SiC ceramics, a novel single-source-precursor was synthesized by the reaction of an allylhydrido polycarbosilane (AHPCS) and divinyl benzene (DVB) to form carbon-rich SiC. As expected, the free carbon contents of resultant SiC ceramics annealed at 1600 °C are significantly enhanced from 6.62 wt% to 44.67 wt%. After annealing at 900–1600 °C
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