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Crystal structure and microwave dielectric properties of Li2(Mg1–xCux)2Mo3O12 ceramics sintered at ultra‐low temperature J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-14 Qi Yuan, Yutong Meng, Tao Wang, Wencai Hu, Sen Wang, Gaobin Liu, Qiyao Wang, Kuoming Song, He Zhao, Shuai Yan, Xin Li
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Large room temperature magnetoelectric response in quasi 1–2 nanocomposite films on mica substrate J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-14 Weijuan Pan, Yuanji Liu, Yuan Ao, Peng Zhou, Fedor Fedulov, Yuri Fetisov, Tianjin Zhang, Sainan Xing, Gopalan Srinivasan, Yajun Qi
A novel quasi 1–2 type magnetoelectric (ME) nanocomposite films composted of one‐dimensional CoFe2O4 nanofibers and two‐dimensional PbZr0.2Ti0.8O3 films on flexible mica substrate have been designed and fabricated. The ME coupling effects have been greatly enhanced due to the release of the clamping effect and the high strain transfer efficiency between the large aspect ratio of the nanofibers and
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Phase transition mechanism and long‐term stability of LiF‐assisted sintered Li2MgxZrO3+x microwave dielectric ceramics J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-14 Xin Chu, Lin Gan, Juan Jiang, Jinzhao Wang, Tianjin Zhang
Herein, Li2MgxZrO3+x (x = 0–1) +2 wt.% LiF ceramics with a rock salt structure were prepared by the solid‐state reaction method. The phase transition mechanism was systematically investigated by X‐ray diffraction, and first‐principles calculations. With a gradual increase in MgO content, the samples underwent a monoclinic‐Li2ZrO3 to tetragonal‐Li2ZrO3 to tetragonal‐Li2MgZrO4 to cubic‐phase transition
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Effect of inert glass on the physical and mechanical properties of zirconia dental ceramics fabricated by digital light processing J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-14 Faqiang Zhang, Kesheng Zhang, Yangbo Zuo, Xia Jin, Jingzhou Yang
Zirconia dental ceramics incorporated with inert dental glass (IDG) were fabricated by digital light processing (DLP). The effects of the amount of added IDG on the physical properties and microstructure of sintered samples were investigated. Highly dense zirconia dental ceramic samples with a relative density of 98.9% were obtained by adding different amounts of IDG sintered at 1500°C. With the addition
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Influence of (Ta Nb Ti V) C powders synthesized by molten salt at low temperature on densification and properties of high entropy carbide ceramics J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-13 Hongbin An, Ruoyu Chen, Saisai Li, Lingfeng Huang, Wenbao Jia, Qianfang Wu, Aiqing Mao
Powder synthesis is crucial for achieving the densification and facilitating widespread applications of high entropy carbide (HEC). Specifically, the production of fine particle‐size powders is essential to enhance the densification of HECs. Consequently, this paper proposes the molten salt method for synthesizing HEC powders. The synthesis process successfully yielded (Ta Nb Ti V) C powders with a
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Excellent temperature stability of piezoelectric properties in PbNb2O6‐based ceramics up to 450°C J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-12 Ruoqi Jin, Xiaodan Ren, Liqing Hu, Mingyang Tang, Zhuo Xu, Yongke Yan
Dense (Pb0.92Ba0.08)Nb2O6‐xmol% MnO2 with 0.25 wt% TiO2 ceramics with a single orthorhombic phase were synthesized through a conventional solid‐state reaction method. Excellent piezoelectric performance (d33 = 90 pC/N) and low dielectric loss (tan δ = 0.5%) are achieved in Mn‐doped samples. Interestingly, the dielectric anomalies are observed in the temperature range of 300–400°C, which could be completely
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Pressure‐driven homogenization of lithium disilicate glasses J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-08 Yasser Bakhouch, Silvio Buchner, Rafael Abel Silveira, Leonardo Resende, Altair Soria Pereira, Abdellatif Hasnaoui, Achraf Atila
Lithium disilicate glasses and glass–ceramics are good potential candidates for biomedical applications, solid‐state batteries, and serve as models of nucleation and crystal growth. Moreover, these glasses exhibit a phase separation that influences their nucleation and crystallization behavior. The atomistic mechanisms of the phase separation and their pressure dependence are unclear so far. Here,
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Optimization of spraying process and stoichiometric stage of plasma‐sprayed Yb2Si2O7 environmental barrier coating J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-07 Zhaolu Xue, Haohan Wang, Xin Wang, Zhenya Zhang, Eungsun Byon, Shihong Zhang
Ytterbium disilicate (Yb2Si2O7) is a potential environmental barrier coating (EBC) material. In this paper, the microstructure and phase composition of plasma‐sprayed Yb2Si2O7 coatings with different spraying process were systematically investigated to optimize the spraying power and spraying distance. Furthermore, in order to obtain Yb2Si2O7 coating with single phase, a certain proportion of SiO2
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Customized linear refractive index GRIN prepared by rapid sintering of multilayer chalcogenide glass powders J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-04 Wenfeng Zheng, Kelun Xia, Guang Jia, Shuangquan Xie, Jierong Gu, Ziqiang Liu, Miaomiao Wu, Tiefeng Xu, Heqi Ren, Chenjie Gu, Zijun Liu, Xiang Shen
Gradient refractive index (GRIN) lenses have recently become a hot topic in compact imaging and achromaticity. Current research focuses on exploiting GRIN materials and upgrading the preparation technology. In this study, infrared (IR) GRIN materials were successfully prepared by spark plasma sintering of multilayer chalcogenide glass (ChGs) powders. ChGs powders were derived from the Ge20Se80‐xTex
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Enhanced dielectric reliability in the X9R‐type Bi1/2Na1/2TiO3‐CaZrO3 relaxor ferroelectric ceramics J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-04 Ju‐Hyeon Lee, Tae‐Soo Yeo, Wook Jo
High‐performance dielectric ceramic capacitors for automotive applications require high operation temperature, thermal stability, and reliability for dielectric ceramics. A broad composition search has been carried out to replace the existing BaTiO3‐based dielectrics having limited upper operating temperature due to the relatively low Curie temperature at around 120°C. However, most of the developed
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Large electrocaloric effect and wide working area in the transition from ferroelectric to nanodomains J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-04 Haoran Feng, Minghui Hao, Guanghua Wu, Ying Zheng, Lishun Yang, Xin Liu, Yiwen Zhao, Xiaoyan Liu, Haibo Zhang, Gang Liu
A large adiabatic temperature change along with a wide operating temperature region is usually required for the electrocaloric materials to fulfill their refrigeration function. In general, doping foreign ions into BaTiO3 is the frequently utilized strategy in order to obtain excellent electrocaloric materials for the practical application. In the current paper, BaTiO3 lead‐free ferroelectric ceramics
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Preparation of (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C high‐entropy ceramic nanopowders via liquid‐phase precursor J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-04 Chenyi Xie, Huaming Miao, Fan Wan, Yanfei Wang, Duan Li, Rongjun Liu
Using citric acid, ethylene glycol, ZrOCl2·8H2O, HfOCl2·8H2O, TiCl4, NbCl5, and TaCl5 as raw materials, the (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C high‐entropy ceramic precursor was prepared by Pechini coordination polymerization method. The precursor and pyrolysis products were analyzed and characterized by different methods. The results showed that the precursor formed a chelate structure, which greatly improved
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Eutectoid decompositions in Ce‐containing ABO3 perovskites: Part II, the case of divorced growth in CeCrO3 J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-04 Aaron C. Johnston‐Peck, Adam J. Biacchi, Russell A. Maier
A eutectoid phase transformation was exhibited by the perovskite CeCrO3 when heated in air. The kinetics of the reaction, microstructure of the product, and mechanisms of the transformation were studied using thermogravimetric analysis, X‐ray and Raman spectroscopy, X‐ray diffraction, and electron microscopy. Fluorite CeO2 and corundum Cr2O3 were formed from the decomposition of CeCrO3. The CeO2 particles
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Effect of WC content on microstructure and mechanical properties of (TiZrHfNbTaMo)C‐15 wt.% Co ceramics J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-04 Xiao‐Chun Deng, Xiao‐Dong Kang, Guo‐Hua Zhang
The (TiZrHfNbTaMo)C‐15 wt.% Co ceramics with excellent comprehensive properties were successfully prepared by vacuum liquid phase sintering. The effects of WC content on the grain size, microstructure, and mechanical properties were investigated. The results showed that WC was dissolved into (TiZrHfNbTaMo)C phase to form a seven‐component solid solution, and the independent WC phase disappeared. The
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Synthesis of high entropy monoboride (Mo0.25W0.25Cr0.25Ta0.25)B powders with abundant twins from oxides J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-04 Lin Li, Shuaihang Qiu, Ji Zou, Jingjing Liu, Wei Ji, Weimin Wang, Zhengyi Fu
High entropy monoborides powders are mainly prepared from metal and boron powders which can be costly. In this study, a novel approach starting from mixed oxides, boron carbide, and graphite was first developed to synthesize quaternary monoboride powders by combining multiple boro/carbothermal reductions (MBCTR). As an exemplar, (Mo0.25W0.25Cr0.25Ta0.25)B powders with purity up to 94.3 wt.% were successfully
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Effect of exposure of metakaolin‐based geopolymer cements to gamma radiation J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-03-04 Daniel A. Geddes, Brant Walkley, Cassandre Le Galliard, Martin Hayes, Susan A. Bernal, John L. Provis
The stability of cementitious materials under the harsh environment they will experience when used for radioactive waste disposal is incredibly important. Therefore, understanding the irradiation resistance of geopolymer cement, a potential alternative binder for the treatment of nuclear waste, is of the utmost importance when trying to develop a safety case for these materials. The study presented
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High insulation resistivity and low dielectric loss in (Ta, Al)‐codoped BaTiO3 colossal permittivity materials J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-29 Jiangtao Fan, Gang He, Zhen Long, Zhanggui Hu
Low insulation resistivity is a key factor limiting the practical application of colossal permittivity (CP) ceramics in electronic components. In this study, BaTiO3–0.01Ta2O5–xAl2O3 (BTAx, x = 0.005, 0.01, 0.015, 0.02) CP ceramics with high insulation resistance were successfully prepared by sintering in N2. In particular, BTA0.015 ceramic exhibits CP (εr = 2.01 × 105, 1 kHz), low dielectric loss (tanδ
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Intrinsic and extrinsic contributions to energy storage performance in potassium sodium niobate–based ceramics J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-28 Jie Xing, Xu Li, Duo Xu, Qifan Chen, Tingting Gao, Zhi Tan, Jianguo Zhu
Both the intrinsic and extrinsic contributions to the high energy storage properties of (K0.5Na0.5)NbO3 were investigated herein by employing Bi(Mg2/3Ta1/3)O3 as a second component to synthesize novel environment‐friendly energy storage ceramics. The role of the second component was confirmed to reduce the intrinsic activation of electrons, which effectively improves the band gap values and reduces
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Photoluminescence spectroscopy to detect microregion stress distribution in glass‐to‐metal seals J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-28 Zheng Liu, Keqian Gong, Yangyang Cai, Zhen Chen, Yong Zhang
The stress distribution in sealing glass is one of the most concerning issues for glass‐to‐metal (GtM) seals. In this study, photoluminescence spectroscopy was applied by exploiting the piezospectroscopic effect of Cr‐doped α‐Al2O3 (ruby), and the overall stress distribution along the radius of a concentric seal was detected and analyzed. It was discovered that the compressive stress first increased
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Mechanical and dynamical stability of major oxide constituents of Portland cement clinker: a density functional theory study J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-28 Jefferson Maul, Davide Mitoli, Alessandro Erba, Ricardo P. S. Dutra
Quantum‐mechanical calculations based on the density functional theory (DFT) enable an effective characterization of a variety of properties of materials at the atomistic level, although at a high computational cost. Here, we fully exploit parallel computing to apply such methods to the study of lattice dynamics and mechanical response of the major oxide constituents of Portland cement clinker: ,
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High energy storage performance of lead‐free Nb‐modified (Bi0.2Na0.2Ca0.2Ba0.2Sr0.2)TiO3 high‐entropy ceramics J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-28 Xue Zhang, Fan Zhang, Yiwen Niu, Zhiqiang Zhang, Yu Bai, Zhan Jie Wang
Owing to the intrinsic chemical disorder of microscopic composition, perovskite high‐entropy ceramics exhibit dielectric relaxation behaviors and are favorable for energy storage performance. In this work, (Bi0.2Na0.2Ca0.2Ba0.2Sr0.2)(Ti1−xNbx)O3 (BNCBST‐xNb, 0.01 ≤ x ≤ 0.25) ceramics were prepared using a hydrothermal method. The results indicate that Nb doping into BNCBST induces lattice expansion
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Optimization in the energy storage properties of Bi0.5Na0.5TiO3–SrTiO3 ceramics by introducing Bi(Mg0.5Zr0.5)O3 J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-28 Shunshun Jiang, Ji Zhang, Dmitry V. Karpinsky, Jinglei Li, Lisha Liu, Yaojin Wang
As one of the important electronic components, the dielectric capacitors for energy storage applications have been extensively studied in recent years. Among various dielectric materials, the perovskite oxide Bi0.5Na0.5TiO3‐based ceramics have become promising candidates due to their high polarization, dielectric tunability, environment‐friendly composition, and so forth. Herein, the relaxor ferroelectric
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Na1/2Bi1/2TiO3‐based ceramics with increased depolarization temperature and piezoelectric coefficient J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-28 Jiao Yang, Pengrong Ren, Teng Wang, Zhiyong Liu, Fuxue Yan
Sodium bismuth titanate‐based materials are expected to be an alternative candidate to lead‐based ceramic materials due to their excellent electrical properties. However, the low depolarization temperature (Td) limits their practical application. In this work, the phase structure evolution and microstructure of 0.9(0.4Na1/2Bi1/2TiO3–0.6BiFeO3)–0.1BaTiO3: xZnO (x = 0.01, 0.03, 0.05, and 0.07) (abbreviated
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Microwave dielectric properties of (Na0.5Bi0.5)MoO4–BaMoO4 composite ceramics with ultralow sintering temperature J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-28 Ahmed Redwan Hazaa Alzakree, Chang‐Hao Wang, Muhammad Shehbaz, Wei Wang, Di‐Ming Xu, Chao Du, Di Zhou
The rapidly ever‐growing wireless communication demands development of low loss, ultralow sintering temperature dielectric ceramics with excellent microwave properties. In this work, fabrication and properties of novel microwave dielectric composite ceramics (1 − x)(Na0.5Bi0.5)MoO4–xBaMoO4 (x = 0.3–0.6), in short as ((1 − x)NBM–xBM), synthesized via solid‐state reaction method with an ultralow sintering
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The effect of iodine on the local environment of network‐forming elements in aluminoborosilicate glasses: An NMR study J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-28 Sami Soudani, Michael Paris, Yann Morizet
Knowledge of the structural organization of nuclear waste glasses at the atomic scale is the basis for further studies of macroscopic properties (e.g., fracture toughness, chemical durability, and leaching rate). Recent studies have focused on the iodine dissolution mechanism in oxide‐based glasses synthesized under high‐pressure conditions, but there is still a lack of key information on the extent
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Dielectric and mechanical properties of porous Si3N4–Kovar composites prepared by low‐temperature oxidation sintering J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-27 Hong Lin, Zihang Xia, Liangliang Cao, Huixing Lin, Hongtao Li, Fancheng Meng, Haiyi Peng
The aim of this study is to investigate the impact of the Kovar glass content on the mechanical and electrical properties of Si3N4–Kovar composites sintering at air atmosphere. To achieve this, Si3N4–Kovar composites were prepared using molding technology with the Kovar glass powder ranging from 20 to 70 wt%. The phase composition, morphology, bulk density, apparent porosity, flexural strength at room
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Micro‐scale mechanical properties of surface layer in ion‐exchanged glass J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-26 Saho Fujita, Tatsuki Ohji, Tsukaho Yahagi, Motoyuki Iijima, Junichi Tatami
Today, ion‐exchanged or chemically strengthened glass is ubiquitously used all over the world, typically for scratch‐free display cover of personal mobile phones. It has been known that the strengthening is due to developments of high compressive stress in the surface layer by its internally constrained dilation . We investigated micro‐scale mechanical properties of the surface layer itself of a Na+‐to‐K+
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Influence of oxygen vacancies on the domain wall stability in BiFeO3 J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-26 Mao‐Hua Zhang, Yueze Tan, Tiannan Yang, Long‐Qing Chen
Oxygen vacancy is the most common type of point defects in functional oxides, and it is known to have profound influence on their properties. This is particularly true for ferroelectric oxides since their interaction with ferroelectric polarization often dictates the ferroelectric responses. Here, we study the influence of the concentration of oxygen vacancies on the stability of ferroelectric domain
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Versatile r.f. magnetron sputtering doping method to produce aluminum‐doped zinc oxide films J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-24 Gabriel Henrique Inácio de Oliveira, Márcia T. Escote, Iseli L. Nantes, Denise Criado
Aluminum‐doped zinc oxide Al:ZnO (AZO) is a non‐toxic material applied as a transparent conductive oxide film. In this study, we report on the structural, optical, and electrical properties of AZO films obtained by thermally oxidizing aluminum‐doped Zn films produced by a versatile and low‐cost method of doping using the magnetron sputtering technique deposition. We use aluminum wire above the zinc
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High‐performance bismuth titanate‐ferrite (Bi5Ti3FeO15) for high‐temperature piezoelectric applications J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-24 Qian Wang, En‐Meng Liang, Chun‐Ming Wang
Advancing the development of high‐temperature piezoelectric sensors requires high‐performance piezoelectric materials with high Curie temperatures, wherein the charge signals can be efficiently collected at elevated temperatures. The bismuth layer‐structured ferroelectric (BLSF) bismuth titanate‐ferrite (Bi5Ti3FeO15, BTF) has recently attracted considerable attention because of its high Curie temperature
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High electric‐field‐induced strain of SnO2‐modified PLSBZT ceramic for actuator applications J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-23 Shaoping Guo, Ruihong Liang, Zhengran Chen, Lizhi Shi, Wugang Wang, Zhiyong Zhou
In this study, piezoelectric and ferroelectric properties of the Pb0.931La0.006Sr0.03Ba0.03(Zr0.535Ti0.465)O3–xwt%SnO2 (PLSBZT–xwt%SnO2) with x = 0–0.6 were investigated comprehensively. When the content of SnO2 was 0.55 wt%, the sample achieved optimum properties obtaining a high Curie temperature (259°C) and a large strain (0.203% at 20 kV/cm). In particular, the sample's maximum strain (Smax) remained
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High‐resolved surface‐enhanced Raman scattering on Ag@TiO2 plasmonic nanostructure J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-23 Xinxin Wang, Jiaming Liu, Jinghui Huang, Jianchun Xu, Limin Guo, Kezhen Hui, Xiaohui Wang
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Atomic transport properties of water in barium–strontium aluminosilicates: Coupling of reactions and diffusion J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-23 Dongxin Gao, Shiliang Luan, Peixuan Li, Ke Ren, William Yi Wang, Jinshan Li, Yiguang Wang
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A quantitative microscopic view on the gas‐phase‐dependent phase transformation from tetragonal to monoclinic ZrO2 J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-23 Maged F. Bekheet, Lukas Schlicker, Radian Popescu, Wiebke Riedel, Matthias Grünbacher, Simon Penner, Aleksander Gurlo
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Dy3+‐ and/or Sm3+‐doped glass–ceramics containing NaGd(MoO4)2 crystalline phase for warm white light applications J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-23 Juxia Tong, Zhiwei Luo, Xinzhu Liu, Haozhang Liang, Xinyu Liu, Pan He, Anxian Lu
The transparent glass–ceramics with Dy3+ and/or Sm3+ doping, which include the NaGd(MoO4)2 single‐crystal phase, were synthesized using the melt‐quenching method followed by heat treatment in the SiO2–B2O3–Na2O–ZnO–MoO3–Gd2O3 system. The formation and fluorescent properties of Dy3+ single‐doped precursor glasses were thoroughly examined, and the optimal doping amount of Dy2O3 was determined to be 0
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Geopolymers made using organic bases. Part I: Synthesis and atomic structure J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-22 Devon Samuel, Waltraud M. Kriven
Geopolymers can act as a facile forming route to aluminosilicate ceramic composites due to being processed as fluids rather than as powders. However, the compositions available via typical alkali geopolymers are limited by the presence of alkali cations, introduced by the alkali silicate solution precursors. In order to expand the ceramic compositions that are accessible by geopolymer processing, this
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Structural disorder and oxygen octahedron evolution via defect engineering for properties enhancement in BF–BT ceramics J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-22 Bing Li, Ting Zheng, Jiagang Wu
The electrostrain properties of bismuth ferrite–barium titanate (BF–BT)‐based ceramics can be well regulated; however, this often occurs at the cost of piezoelectricity, and their electrostrain‐temperature stability is poor. To address these problems, defect engineering has been utilized to enhance the comprehensive properties via the unequal substitution of Na+. In this study, 0.69BiFeO3–0.3BaTiO3–0
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Multi‐mode temperature sensing of Lu2WO6:Er3+,Yb3+ up‐conversion materials J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-22 Mengjie Feng, Lianjie Li, Jiajia Guo, Qiang Wang, Tao Pang, Hai Guo
To develop multi‐mode fluorescence thermometer with high performance, Lu2WO6:Er3+,Yb3+ materials were successfully designed and prepared. Under 980 nm excitation, the material can achieve accurate temperature measurement under three models. The above three models are based on different parameters, including two FIR (fluorescence intensity ratio) derived from two thermally coupled energy levels (TCELs)
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New spinel‐structured high‐entropy oxides with high‐ and stable‐infrared radiation properties J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-21 Qifa Wan, Faming Zhang, Yifeng Xiong
Spinel‐structured high‐entropy oxides (HEOs), the novel materials, have recently attracted great attention for their unexpected properties and extensive applications. In this work, employing a facile scalability process of solid‐state reaction method, we synthesized a new kind of non‐equimolar (Co2/11Mn2/11Fe2/11Cr2/11Ni2/11Cu1/11)3O4 HEOs powder. However, under the same condition, the raw mixed oxide
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High‐strength Si–SiC lattices prepared by powder bed fusion, infiltration‐pyrolysis, and reactive silicon infiltration J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-21 Marco Pelanconi, Samuele Bottacin, Giovanni Bianchi, Dietmar Koch, Paolo Colombo, Alberto Ortona
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Atomic‐level structure evolution of calcium silicate hydrate nucleation process, the amorphous‐to‐crystalline pathway J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-20 Yu Zhang, Jiandong Wu, Liguo Wang, Guowen Sun, Dongshuai Hou, Jin Yu, Jinyang Jiang
Calcium silicate hydrate (C‐S‐H) synthesis follows multistep nucleation processes ranging from amorphous globules to nanocrystals. This type of nonclassical nucleation pathway attracts extensive interest and yet related molecular processes are mostly unexplored. Herein, atomic‐level structure evolution during this process is unveiled. From inside to outside of the globule, the atomic arrangement evolves
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A quasi‐31‐vibrator method for the characterization of piezoelectric full matrix parameters using a single sample J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-20 Da Huo, Biao Wang, Changqing Sun, Rui Zhang, Xudong Qi
The full matrix parameters of a piezoelectric material are crucial for designing and evaluating piezoelectric devices. However, due to their inverse problematic nature, commonly used single‐sample characterization methods heavily depend on the accuracy of initial values and mode matching. In this paper, we propose a quasi‐31‐vibrator method to directly evaluate these parameters by designing the sample
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Effects of water on cold‐sintered highly dense dicalcium phosphate anhydrous bioceramic using its hydrate J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-19 Xu Wang, Hexin Zhang, Xiao Yu, Xiumei Mo, Jie Gao, Yunfeng Hu, Jie Min, Qi Ding, Yuchi Fan, Wan Jiang
The dicalcium phosphate anhydrous (DCPA, CaHPO4) bioceramic has long been difficult to prepare by conventional sintering techniques due to its weak thermal stability. Here, the DCPA ceramic is prepared at 250°C by cold sintering process (CSP) using the dicalcium phosphate dihydrate (DCPD, CaHPO4·2H2O) as the starting powder. It is found that the dehydration temperature of DCPD powder is greatly reduced
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Composition-dependent structural role of lead in aluminoborate and galloborate glasses: A solid-state NMR study J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-09 Arun Krishnamurthy, John E. C. Wren, Vladimir K. Michaelis, Scott Kroeker
Investigations on binary lead-bearing glass systems have shown that Pb2+ functions as a charge compensator at low concentrations and can participate in network formation at higher loadings. We use multinuclear magnetic resonance spectroscopy to investigate the mechanism underlying this dual-role nature of Pb2+ in ternary lead-borate glasses containing aluminum or gallium. 207Pb nuclear magnetic resonance
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Isotropic negative thermal expansion in ZrW2O8 and HfW2O8 from 1100 to 1275°C J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-07 Benjamin S. Hulbert, Dylan W. Blake, Gerard S. Mattei, Waltraud M. Kriven
ZrW2O8 (ZrO2•2WO3) and HfW2O8 (HfO2•2WO3) have been the focus of thermal expansion studies due to their isotropic negative thermal expansion (NTE) measured previously at temperatures below 775°C. This work presents measurements of these materials at their thermodynamically stable temperature ranges of 1105 and 1257°C for ZrW2O8 and 1105–1276°C for HfW2O8, where they were characterized with in situ
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Investigate the relationship between densification and grain size of IGZO target by phase-field simulation J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-07 Xiaokai Liu, Benshuang Sun, Wenyu Zhang, Huiyu Zhang, Hetao Zhao, Yongge Zhao, Yongchun Shu, Yang Liu, Jilin He
The phase-field method was employed to simulate the effects of pores on grain growth in the indium gallium zinc oxide (IGZO) targets during conventional and two-stage sintering (TSS). The findings indicated that the TSS method effectively suppressed the rapid growth of grains. With an increase in porosity and a more prominent pore size, the rate of grain growth accelerated, resulting in the formation
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Ultrafast laser ablation of tungsten carbide: Quantification of threshold range and interpretation of feature transition J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-07 Xiong Zhang, Chunjin Wang, Benny C. F. Cheung, Gaoyang Mi, Chunming Wang
Tungsten carbide was manufactured by picosecond laser in this study. Shapes of the ablated craters evolved from parabolic-like (less than 10 pulses) to Gaussian-like (more than 500 pulses) as the pulse number increased. The shape changes were closely associated with the discontinuous diameter expansion of ablated crater. To explain these phenomena, two thresholds were identified: an upper threshold
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A highly stable and conductive cerium-doped Li7P3S11 glass-ceramic electrolyte for solid-state lithium–sulfur batteries J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-07 Amirhossein Mirtaleb, Ruigang Wang
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A strain density function to analyze particle size effects during high velocity impacts of yttria J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-03 Aidan H. Moyers, Michael F. Becker, Desiderio Kovar
The impact behavior of a single yttria (Y2O3) nanoparticle onto a Y2O3 substrate is studied as a function of particle velocity (300–1200 m/s) and diameter (12–50 nm) using molecular dynamics simulations. To analyze the results, a strain density function is developed to provide both quantitative and qualitative information about the deformation mechanisms that contribute to the final state of the system
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Bandgap engineering—Influence of the evolution of (Zn/Mg)Al2O4:Cr3+ spinel phosphors on the photoluminescence properties J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-01 Ming Qiang, Xiaomeng Yin, Yang Tang, Xueke Xu, Hui Lin, Dawei Zhang
As a luminescent center ion in materials for deep red and near-infrared light, Cr3+ has been extensively studied in octahedral host materials. In this study, using zinc aluminate (ZnAl2O4) and magnesium aluminate (MgAl2O4) spinels with abundant octahedra as substrates, a series of Zn1−xMgxAl2O4:0.5%Cr3+ (x = 0, 0.2, 0.4, 0.6, 0.8, and 1) fluorescent powders were first prepared via a high-temperature
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Solid state synthesis of BiFeO3 occurs through the intermediate Bi25FeO39 compound J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-01 Corrado Wesley, Leah Bellcase, Jennifer S. Forrester, Elizabeth C. Dickey, Ian M. Reaney, Jacob L. Jones
The solid-state synthesis of perovskite BiFeO3 has been a topic of interest for decades. Many studies have reported challenges in the synthesis of BiFeO3 from starting oxides of Bi2O3 and Fe2O3, mainly associated with the development of persistent secondary phases such as Bi25FeO39 (sillenite) and Bi2Fe4O9 (mullite). These secondary phases are thought to be a consequence of unreacted Fe-rich and Bi-rich
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Y1/6Yb5/6TaO4/8YSZ composite ceramics with enhanced mechanical and thermal properties J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-02-01 Jiankun Wang, Lin Chen, Luyang Zhang, Mengdi Gan, Baihui Li, Jing Feng
Ceramic thermal barrier coatings (TBCs) with high toughness and low thermal conductivity are important for developing aero engines with high thrust-to-weight ratio and thermal efficiency. In this work, the properties of tantalate Y1/6Yb5/6TaO4 (YYT) were optimized by introducing 8 wt.% yttria-stabilized zirconia (8YSZ), synthesized using spark plasma sintering, as a second-phase ceramic. The highest
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Remarkably improved nonlinearity and thermal stability of CaYNbMnO7 thermosensitive ceramics via the cold-sintering process J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-01-31 Na Li, Qing Zhao, Bo Zhang, Huimin Chen, Aimin Chang, Zhilong Fu
The cold-sintering process (CSP) uses a transient low-temperature solvent, such as water or water with dissolved solutes consistent with the ceramic composition, to achieve functionalization at lower temperatures via the dissolution and precipitation principle. Here, during the CSP, the use of molten NaOH as a flux solvent promoted the rearrangement and precipitation of CaYNbMnO7 particles. CaYNbMnO7
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Impact of Ca, Al, and Mg on reaction kinetics, pore structure, and performance of Fe-rich alkali-activated slag J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-01-31 Nana Wen, Arne Peys, Tobias Hertel, Yiannis Pontikes
Alkali-activated materials can be formed by alkali-activation of Fe-rich non-ferrous metallurgical slags (AA-NFMS). To study NFMS in AA-NFMS systematically, five NFMS were synthesized, with different CaO (6–16 wt%), Al2O3 (7–11 wt%), and MgO (0–4 wt%) contents, while keeping the same FeOx/SiO2 molar ratio. The effect of slag chemistry and the alkali ions (Na+/K+ = 0, 0.5, and 1) in alkali-activating
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Optimized thermoelectric performance driven by A-site deficient in SrxLa0.1TiO3−δ/TiO2−y composites J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-01-31 Zhihao Lou, Ping Zhang, Penghui Chen, Ziyao Wei, Jianjun Gou, Jie Xu, Chunlin Gong, Feng Gao
For thermoelectric applications at high temperatures, perovskite SrTiO3 is a promising contender as an n-type oxide thermoelectric (TE) material. In this work, SrxLa0.1TiO3−δ/TiO2−y composite ceramics were successfully synthesized by solid state reaction, using a combination of A-site cation vacancy and composite fabrication. Through X-ray diffractometer and scanning electron microscopy analysis, a
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Interactions of gadolinium hafnate and zirconate with silicate melts J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-01-31 Andrew R. Ericks, Collin S. Holgate, Nikita Basilyan, Carlos G. Levi, Frank W. Zok
Rare earth hafnates and zirconates are candidate materials for thermal and environmental barrier coatings (T/EBC) to protect gas turbine engine components from various environmental threats, including molten silicates derived from ingested mineral debris. This article examines the reactions of Gd2Hf2O7 (GHO) and Gd2Zr2O7 (GZO) to exemplary acidic and basic silicate melts. Exposure experiments at 1400°C
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Effect of calcium and potassium oxide addition on the viscosity and fragility of a calcium aluminosilicate melt J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-01-31 Sohei Sukenaga, Yann Gueguen, Fabrice Celarie, Tanguy Rouxel, Masanori Tashiro, Shinichiro Yoshida, Noritaka Saito, Kunihiko Nakashima, Hiroyuki Shibata
Fragility is commonly quantified as the magnitude of change in viscosity at a temperature close to the glass transition temperature (Tg). It is a critical characteristic of melts used in scientific and industrial applications. The fragility of silicate melts generally increases with the depolymerization of silicate anions upon the addition of alkali or alkaline earth oxides. However, the effects of
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Defect assisted self-reduction and post annealing of Mn ions activated garnet transparent ceramics J. Am. Ceram. Soc. (IF 3.9) Pub Date : 2024-01-31 Bin Yu, Bingheng Sun, Jintai Fan, Haoying Hao, Fangliang Shen, Jingang Wang, Benxue Jiang, Long Zhang, Jun Sun
Transition-metal Mn2+ ion-doped transparent ceramics (TCs) are promising color-convertors to improve color rendition for solid-state lighting. However, the stabilization of Mn2+ remains a challenge owing to the changeable atmosphere in the specific preparation of TC. In this work, the variations of valence states of Mn ions in typical garnet lattice host (YAG and LuAG) throughout the TC fabrication