Article
Chemistry, Multidisciplinary
W. Wang, X-G Tang, Y-P Jiang, Q-X Liu, W-H Li, X-B Guo, Z-H Tang
Summary: The addition of BMHO in lead-free piezoelectrics improves the performance by inducing a phase transition from rhombohedral to tetragonal, tuning the grain size, and reducing the transition temperature and dielectric loss.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Engineering, Electrical & Electronic
Minghao Gao, Zide Yu, Jian Fu, Yi Zhang, Ruzhong Zuo
Summary: A novel ceramic material with excellent piezoelectricity, high-temperature stability, and high ferroelectric transition temperature was reported. The material exhibited a phase transition from rhombohedral to tetragonal phase, accompanied by a normal-relaxor ferroelectric transformation, leading to a significant enhancement of the piezoelectric activity. This material provides a guideline for the design of high-temperature piezoelectric ceramics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Jie Wu, Gaochao Zhao, Wei Dong, Chengbing Pan, Kun Tao, Wenjuan Huang, Peng Tong, Jie Yang, Xuebin Zhu, Lihua Yin, Wenhai Song, Yuping Sun
Summary: This study systematically investigates the effects of quenching on the structural, electrical, dielectric, ferroelectric, and piezoelectric properties of ceramics. Optimal piezoelectricity and FE Curie temperature are achieved through optimized quenching rate and temperature. The quenching effect on piezoelectricity is particularly significant for samples near morphotropic phase boundaries, which can be attributed to changes in phase ratio and domain structure/defect dipole orientation caused by quenching. Additionally, a new poling method, cooling the sample at a constant dc current across FE TC, is established to improve the piezoelectricity.
INORGANIC CHEMISTRY
(2022)
Article
Materials Science, Ceramics
Zdenek Chlup, Daniel Drdlik, Hynek Hadraba, Oldrich Sevecek, Filip Siska, Jiri Erhart, Karel Maca
Summary: The purpose of this article is to clarify the fundamental processes that occur near the Curie temperature, with a focus on the fracture behavior of pure polycrystalline barium titanate. The study combines experimental methods with numerical simulations to investigate the effects of grain size on the material's temperature, lattice transformation, and mechanical properties. Understanding this behavior is essential for the processing and correct application of lead-free barium titanate materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Tsang-Tse Fang, Yu-Chi Lu, Hsing- Hsiang
Summary: In this study, the calculation of space charge potential, the difference of the activation energy of grain boundary and grain, and the ratio of conductivity of grain boundary and grain at different temperatures of polycrystalline ceramics were reevaluated. The model takes into account charge carriers hopping through bulk and grain boundary barriers with different mobility. It was found that the present model is more accurate and precise than previous models, indicating that the assumption of the same mobility of charge carriers hopping through bulk and grain boundary barriers made in previous studies is unsuitable.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Yizhou Xiao, Yuanbo Yang, Shuai Yang, Jinglei Li, Dan Liu, Jie Wu, Mingwen Wang, Chunchun Li, Fei Li
Summary: In this study, a special BaTiO3-0.03Mg-0.02Y-0.02CaZrO(3) ceramic with a high dielectric permittivity of 3000 and the dielectric variation below +/- 13% in the temperature range of -55-150 degrees C was designed and fabricated to meet the requirements of X8R capacitors. Grain size engineering and cation doping techniques were employed to prepare the BaTiO3-based ceramics with fine grains and improved temperature stability. MLCCs fabricated using these high-permittivity BaTiO3-based materials exhibited a high dielectric constant of 2950 and a high breakdown field (410 kV/cm), satisfying the X8R criterion.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Muhammad Uzair, Yaseen Iqbal, Khizar Hayat, Raz Muhammad
Summary: In this study, Li2WO4 was used as an additive to lower the sintering temperature of BaTiO3 ceramics. The addition of Li2WO4 effectively reduced the sintering temperature from 1350 to 1150 degrees C. Different phases were observed at different additive concentrations, and the electrical properties of the samples were affected accordingly. The results suggest that the extrinsic conduction mechanism is responsible for the transport across the sample.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Xueliang Duan, Juanjuan Wang, Yuyang He, Pengkang Ma
Summary: In this study, high-dielectric (1 - x)(Bi0.5Na0.5)TiO3-x(Ba0.85Ca0.15)(Zr0.1Ti0.9)O-3 (BNT-BCZT) ceramics were fabricated by combining solid-state sintering technique and two-part synthesis. XRD measurements confirmed the formation of a stable solid solution between BNT and BCZT. The BNT-BCZT ceramics exhibited larger piezoelectric constant, lower remnant polarization, and lower coercive field compared to pure BNT ceramics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Physics, Multidisciplinary
Ali B. Abou Hammad, A. M. Mansour, Amany M. El Nahrawy
Summary: Nano-structure ferromagnetic-ferroelectric composite materials prepared by the sol-gel method, such as Potassium Barium titanate doped with Ni2+ nanoparticles, exhibit enhanced thermal stability and optical bandgap. The incorporation of Ni2+ nanoparticles can alter the structural and band structures interactions, leading to efficient charge carrier transfer.
Article
Physics, Applied
Minghai Yao, Long Cheng, Shenglan Hao, Samir Salmanov, Mojca Otonicar, Frederic Mazaleyrat, Brahim Dkhil
Summary: Multiferroic materials have been extensively studied due to their potential for multifunctional device applications. The scarcity of single-phase multiferroics and their low coupling at temperatures above room temperature pose challenges for further applications. A perovskite-perovskite composite of 3BiFeO(3)/7BaTiO(3) with combined ferroelectricity and ferromagnetism is proposed. The sintering temperature can be tailored to achieve multiferroic properties, and the ferromagnetic characteristics are superior to solid solutions. The competition between antiferromagnetic and ferromagnetic interactions in the transition metal cation sublattice is also investigated.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Shuai Cheng, Boping Zhang, Shengjie Ai, Hongbao Yu, Xin Wang, Jiahao Yang, Changrong Zhou, Jingtai Zhao, Guanghui Rao
Summary: The addition of Bi0.5Na0.5TiO3 in BiFeO3-BaTiO3 ceramics allows for the tuning of piezoelectric responses. By optimizing the composition, the ceramics show enhanced d33 and TC, making them potential candidates for lead-free piezoceramics at high temperatures.
JOURNAL OF MATERIOMICS
(2023)
Article
Materials Science, Ceramics
Alireza Ramezani, Hossein Abdizadeh, Mohammad Reza Golobostanfard
Summary: BaTiO3 and SrTiO3 thin films and BaTiO3/SrTiO3 lamellar composites were successfully synthesized using the sol-gel spin-coating method in this study. The morphology and band gap of the composite samples could be altered by changing the periodicity of the samples. The optical properties of the multi-stacked composites, including dielectric constant, dielectric loss, impedance, Urbach tail, extinction coefficient, and electric modulus, were also investigated.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
S. A. N. Franca Junior, W. Acchar, S. L. A. Dantas, P. H. Chiberio, H. P. A. Alves, M. R. D. Bomio, F. V. Motta, F. Bohn, A. Ferreira, F. Vaz, M. A. Correa
Summary: We conducted a comprehensive investigation on the high-frequency dielectric properties of (ZrO2)100-x(BaTiO3)x heterostructures. By adjusting the content of BaTiO3, we could modify the dielectric constant of the resulting ceramic sheets. Our results demonstrated successful fabrication of heterostructured ceramic sheets and the ability to tailor the electric, structural, and dielectric properties of both ZrO2 and BaTiO3 materials. Furthermore, the evolution of the dielectric constant could be manipulated according to specific technological applications.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Xiaodan Ren, Mingyang Tang, Xin Liu, Yike Wang, Zhuo Xu, Yongke Yan
Summary: Texture engineering with BT templates was found to enhance the dielectric and piezoelectric response of BS-60PT ceramics. Excessive amounts of BT templates reduced the comprehensive properties, while ceramics with 2% BT templates demonstrated excellent piezoelectric properties and temperature stability.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Ceramics
Shuai Cheng, Kehong Zhang, Qianshu Li, Boping Zhang, Jianguo Chen, Xinxin Yang, Jingtai Zhao, Guanghui Rao, Siqi Shi
Summary: In this study, multifunctional ceramics with Pr3+ doped in BNBT were successfully synthesized and exhibited improved piezoelectric properties. The ceramics underwent a phase transition and an increase in density with increasing doping level. Additionally, under excitation, the ceramics emitted bright red light. The Pr-doped BNBT ceramics show great potential for applications requiring electro-optic integration and coupling devices.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Shengnan Zhang, Chunlin Zhao, Kai Zhu, Jiaqi Zhao, Yinyi Gao, Ke Ye, Jun Yan, Guiling Wang, Dianxue Cao
Summary: Aqueous Mg ion batteries (AMIBs) have great potential for energy storage due to their high capacity, abundant resource, and environmental friendliness. However, the scarcity of suitable anode materials limits the development of AMIBs. In this study, a new polymer anode material with a flower-like nanosheet structure is synthesized for aqueous Mg-Na hybrid-ion battery. The polymer electrode material exhibits high discharge specific capacity and maintains its framework structure during the cycling process of the hybrid-ion battery.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Materials Science, Ceramics
Lin Zhao, Huijing Zheng, Ziyu Ma, Wenjuan Wu, Min Chen, Hong Tao, Jian Ma, Chunlin Zhao, Bo Wu
Summary: By adjusting the structure, a KNN-based relaxor ceramic was designed to simultaneously achieve high electrostrictive strain and Q33. It exhibited low hysteresis electrostrictive strain and outstanding temperature stability in the temperature range of 20-180°C. These results will contribute to accelerating the application of KNN-based electrostrictive materials in actuators.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Xiao Wu, Yaojia Lu, Jinfeng Lin, Fangyuan Yu, Chunlin Zhao, Cong Lin, Min Gao, Tengfei Lin, Qiwei Zhang
Summary: A novel strategy for achieving completely reversible photochromic (PC) regulation based on KNN-based thick films is proposed. The PC self-recovery behavior can be optimized by forming inter-electronic levels via Tm/Yb co-doping in KNN. The obtained thick films exhibit a reversible PC self-recovery reaction within 6 min. This work is expected to provide effective guidance for the further utilization of PC materials.
CERAMICS INTERNATIONAL
(2023)
Article
Thermodynamics
Yilong Li, Wenkai Shen, Guoqing An, Zhenbin Du, Ping He, Weige Wu, Chunlin Zhao, Tong Zhou, Shili Jiang, Xinxing Qian
Summary: This paper evaluates the heat transfer performance of transformers using FR3 insulating oil through experiments and numerical simulations. The results show that FR3 insulating oil has better heat transfer performance than mineral oil in the ODAF cooling mode. With an increase in coil heat load, FR3 insulating oil demonstrates enhanced cooling performance, particularly in the vicinity of the guide plate.
HEAT AND MASS TRANSFER
(2023)
Article
Materials Science, Ceramics
Jiahao Jiang, Shuaimin Chen, Chunlin Zhao, Cong Lin, Xiao Wu, Min Gao, Tengfei Lin, Changqing Fang
Summary: This study employed two-step cold sintering process (CSP) under different pressures to prepare (K0.5Na0.5)NbO3 (KNN) ceramics, and found that the density of KNN green pellets can be increased by enhancing the pressure of the second-step CSP. Furthermore, it was observed that high pressure can accelerate the dissolution of K+ and result in more Na+ in some grains, and the diffusion rate of Na+ in grains is better than K+, which promotes the growth of grains. As a result, the piezoelectric property is improved even at low ceramic density due to the larger grains with higher performance composition. Hence, the pressure and inhomogeneous dissolution of alkali metal ions in CSP play a significant role in grain growth and piezoelectric enhancement.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Yang Li, Ting Zheng, Bing Li, Jiagang Wu
Summary: The resistivity and leakage current of bismuth ferrite-barium titanate-based ceramics have been regulated in this study by changing the relaxation degree and defect dipoles. Introduction of Sb led to improved resistivity in relaxor ferroelectrics with chemical-homogeneous grain structure and strip-shaped/submicron-sized coexisted domains, while deteriorated properties appeared in relaxors with core-shell structure and tweed-like ferroelectric domains. The improved insulation in relaxor-ferroelectrics was attributed to decreased concentration of oxygen vacancies and Ti3+, while the emergence of core-shell structure and conductive channels resulted in decreased resistivity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Qian Wang, Ruichen Li, Haoyue Xue, Xi-xi Sun, Laiming Jiang, Jiagang Wu
Summary: Piezoelectric ultrasonic energy harvesters (PUEHs) are emerging technologies that utilize ultrasonic excitation for wireless power systems. However, most current PUEHs use lead-based materials that are harmful. This study presents a composite strategy to enhance the piezoelectric coefficient and dielectric constant, resulting in improved PUEHs with high energy transduction coefficient. The lead-free composites exhibit enhanced performance and can directly power LED arrays, suggesting their potential as wireless power sources.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Nanoscience & Nanotechnology
Xiao Wu, Fangyuan Yu, Rui Xiong, Peng Wang, Ping Zhou, Baisheng Sa, Cong Lin, Chunlin Zhao, Min Gao, Qiwei Zhang
Summary: Through ion-doping induced defect engineering, a strategy to construct deep-lying traps in (K0.5Na0.5)-NbO3-based ferroelectric ceramics is proposed, enabling the realization of highly transparent ceramics with ultrafast photochromic response time, high efficiency, and high rate, making them promising for optical storage and imaging applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Yu Zhang, Lijuan Huang, Chung Ming Leung, Wei Zhang, Zhixin Xu, Jiaxing Xie, Wuming Xue, Xiao Wu, Chunlin Zhao, Tengfei Lin, Cong Lin, Min Gao
Summary: The electric-field-modulation (E-modulation) of photoluminescence (PL) properties in rare-earth Er3+-doped Pb0.96La0.04Zr0.9Ti0.1O3 (PLZT) antiferroelectrics (AFEs) has been investigated. The AFE phase stability of PLZT doped with various Er contents and their E-modulated PL properties have been systematically studied. The ceramics exhibit both upconversion and downconversion PL effects and show excellent E-dependent dual-mode PL tunability, demonstrating the potential for optoelectronic applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Deqing Tai, Xuan Zhao, Ting Zheng, Jiagang Wu
Summary: BiFeO3-BaTiO3 (BF-BT) based lead-free piezoceramics are desired for high-temperature applications of piezoelectric sensors with a high Curie temperature and good piezoelectric properties. Oxygen vacancies have a significant effect on electrostrain and piezoelectric properties, but the relationship between oxygen vacancy concentration and these properties is complex. This study explores the influence of oxygen vacancy concentration on the transient piezoelectric response, aging behavior, and temperature stability of BF-BT ceramics.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
Yifeng Huang, Xin Wang, Yinchang Ma, Xiang Lv, Jiagang Wu
Summary: This study investigates the effect of K/Na ratio on the phase structure, ferroelectric domains, and piezoelectric properties of potassium sodium niobate (KNN)-based ceramics. It reveals that high Na+ content leads to large ferroelectric domains, while high K+ content results in local polarity heterogeneity and distinct dielectric relaxational behavior. The balanced local polarity and stress heterogeneities contribute to improved piezoelectricity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yifeng Huang, Yinchang Ma, Xi-xiang Zhang, Jing Lyu, Xiang Lv, Jiagang Wu
Summary: This study investigates the competitive relationship between bismuth ion (Bi3+) and praseodymium ions (Pr3+) in potassium sodium niobate (KNN)-based ceramics. By substituting Bi3+ with Pr3+, the researchers observed changes in the phase structure and electrical properties of the materials, as well as an impact on the piezoelectricity. Experimental findings and calculations reveal the underlying mechanism behind this competition between Bi3+ and Pr3+ ions.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Deqing Tai, Bing Li, Haoyue Xue, Ting Zheng, Jiagang Wu
Summary: Rare earth doping is widely used to enhance the electrical properties of piezo/ferroelectric materials. In this study, two types of rare earth ions with different ion radii (La3+ and Sm3+) were introduced into Bi1-xRexFeO3-BaTiO3 ceramics. The results showed that doping an appropriate amount of rare earth ions can effectively improve the ferroelectricity and strain response. The enhancement of electrical properties can be attributed to the increase in the number of activated domains, increased off-centering of Bi ions, displacement of B-site ions, and enhanced lattice deformation. Notably, Sm-doped ceramics exhibited stronger intrinsic ferroelectric and strain response compared to La-doped ceramics, although a larger electric field was required to release the intrinsic response due to the larger ionic radius difference between Bi3+ and Sm3+.
Article
Materials Science, Ceramics
Lingjie Wu, Ting Zheng, Jiagang Wu
Summary: Excellent piezoelectric properties and fatigue resistance have been achieved in KNN-based ceramics with polymorphic multiphase coexistence. The ceramic with multi-phase coexistence exhibits excellent fatigue resistance, while the ceramic with orthorhombic phase shows obvious electrical fatigue.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Chemistry, Multidisciplinary
Junyi Gong, Wanjun Gong, Bo Wu, Haoran Wang, Wei He, Zhongyang Dai, Yangzhong Li, Yong Liu, Zhiming Wang, Xiaojun Tuo, Jacky W. Y. Lam, Zijie Qiu, Zheng Zhao, Ben Zhong Tang
Summary: This research paper introduces a universal database for aggregate materials in the field of aggregate science research. The database contains over 1000 entries of organic aggregate material systems and provides various functions for indexing, searching, manipulating, fetching and depositing data entries. It also offers a background calculation service and an API for the development of prediction or regression models based on machine-learning algorithms.
Article
Materials Science, Ceramics
Dan Zhao, Yi Feng, Zhipeng Pi, Fan Zhang
Summary: Phase equilibria in the ZrO2-GdO1.5-TaO2.5 (ZGTO) system were experimentally investigated, and the differences between ZGTO and the existing ZrO2-YO1.5-TaO2.5 (ZYTO) were discussed. The study is useful for thermodynamic assessment of ZGTO and can guide the design of novel thermal barrier coatings materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yutaka Ohya, Wingki Mey Hendra, Chika Takai-Yamashita, Takayuki Ban
Summary: Diffusion couples of rutile and corundum single crystals were prepared and examined to study the solid solution and precipitation of corundum in rutile during cooling. Different precipitation forms of corundum were observed under different cooling conditions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiaming Zhan, Yunfa Guo, Hao Wang
Summary: This study systematically investigates the mechanical behaviors of calcium fluoride in humid environments. The effects of water on the deformation and plastic enhancement of CaF2 under indentation are explored through microindentation experiments, atomic simulations, and Raman spectroscopy measurement.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hangfeng Zhang, Henry Giddens, Theo Graves Saunders, Matteo Palma, Isaac Abrahams, Haixue Yan, Yang Hao
Summary: The relationship between low and high frequency tunabilities in tin substituted barium titanate ceramics was investigated. It was found that there are differences in tunabilities at different frequencies due to the different activities of larger ferroelectric domains and polar nanoclusters.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Kaibiao Xi, Jiacheng Liu, Beibei Song, Huarong Cheng, Yihao Li, Xiaole Yu, Mupeng Zheng, Mankang Zhu, Yudong Hou
Summary: Composite modulation in the superparaelectric state of the BTBZ-CT system is proposed as an effective strategy to achieve both NTCC and excellent energy storage performance in dielectric ceramics. The addition of BZ and CT to BT ferroelectrics can move the SPE state to the normal use temperature zone, resulting in enhanced NTCC characteristics and energy storage performance. Furthermore, intentional precipitation of CT at grain boundaries can refine the grain size, increase the bandgap, and strengthen the local electric field distribution, thereby enhancing the breakdown electric field.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hamed Salimkhani, Lovro Fulanovic, Till Froemling
Summary: The demand for robust multilayer ceramic capacitors with high-temperature and high-power capabilities is increasing rapidly. However, cost-effective production is a challenge. This study investigates the use of Na0.5Bi0.5TiO3-based materials as promising lead-free options. By adding sintering aids, the sintering temperature of Na0.5Bi0.5TiO3-BaTiO3-CaZrO3-BiAlO3 solid solutions was successfully reduced to 975 degrees C, suitable for co-sintering with Cu electrodes without adverse effects on capacitor properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Mingxing Li, Ran Mo, Zeshui Xu, Jie Zhou, Conglin Zhang, Xuefeng Cui, Fang Ye, Laifei Cheng, Ralf Riedel
Summary: Polymer infiltration and pyrolysis is an effective method for preparing ceramic matrix composites. The transformation of polymer to ceramic during the process affects the residual stress and interface behavior in the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yan Kang, Lin Chen, Chang-Jiu Li, Guan-Jun Yang
Summary: A novel abradable seal coating with low hardness and high bonding strength was successfully designed and prepared. This coating has significantly higher abradability and erosion resistance compared to metal-based coatings, and can retain excellent abradability and have a long lifetime during service.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Qingzhong Song, Xiangdong Zha, Ming Gao, Yingche Ma
Summary: This study analyzes the influence of calcia refractory purity on the properties of calcia crucibles. Higher purity calcia results in well-developed grains and improved hydration resistance, leading to better high-temperature strength and thermal shock resistance. In contrast, lower purity calcia crucibles exhibit inferior properties. Therefore, high-purity calcia is considered a potential refractory for manufacturing oxide crucibles.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sehreish Abrar, Faisal Nazeer, Zhuang Ma, Ling Liu, Abdul Malik, Mustafa Kamal, Abdullah G. Al-Sehemi
Summary: To raise the operating temperature of Si-based ceramic matrix composites (CMCs), researchers have applied thermal/environmental barrier coating (T/EBCs) materials, typically rare earth silicates. However, the high thermal conductivity and the mismatch of thermal expansion have been major challenges in developing new materials that can offer thermal insulation and environmental protection to CMCs. In this study, entropy engineering was used to create a multicomponent equi-atomic single-phase pyro silicate with extremely low thermal conductivity and enhanced water vapor corrosion resistance. The research findings show the potential of high entropy disilicates in achieving ultra-low thermal conductivity and low weight loss in corrosive environments.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zi-bo Niu, Daxin Li, Dechang Jia, Zhihua Yang, Kunpeng Lin, Paolo Colombo, Ralf Riedel, Yu Zhou
Summary: In this study, SiBCN ceramics with a special structure were prepared to improve the oxidation resistance. The effect of the structure on oxidation behavior and kinetics was investigated, revealing that the special structure can effectively inhibit heterogeneous oxidation and enhance the oxide layer composition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Melike Donmez, Metehan Erdogan, Cihangir Duran
Summary: The limited densification of CeO2 ceramics was improved by using an anorthite-based glass, resulting in high dielectric constant and quality factor with minimum dielectric loss. The CeO2-(anorthite-based) glass ceramic showed promising results in terms of low temperature densification and microwave properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
S. Rahmati, R. G. A. Veiga, J. Mostaghimi, T. Coyle, A. Dolatabadi
Summary: This study provides an atomic-scale description of the high-velocity impact of alpha-Al2O3 particles onto an alpha-Al2O3 substrate during Aerosol Deposition (AD). The results suggest that the crystal orientation plays a crucial role in both plasticity and damage of the nanoparticles. Impact velocity has a direct correlation with plasticity and fragmentation, but adhesion efficiency has only a marginal increase. The crucial element lies in the substrate's surface alterations caused by the fragments left on the substrate after impact.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Bo-Wen Chen, Yan-Mei Kan, De-Wei Ni, Chun-Jing Liao, Hong-Da Wang, Yu-Sheng Ding, Shao-Ming Dong
Summary: This study characterized the long-term and repeated ablation properties of modified Cf/HfC-SiC composites with YB4-Al2O3-Si3N4 under an air plasma torch. The structural stability and viscosity of the oxide layer were found to affect the ablation resistance of the composites. By forming nano c-HfO2 grains and high-viscosity Al-Si-Y-O glassy phase, the structural stability of the oxide layer was improved, resulting in enhanced ablation resistance. However, the oxidation of Si3N4 led to the formation of NO, NO2, and excessive SiO2 glassy phase, which resulted in a porous structure and reduced the viscosity of the oxide layer. Therefore, the addition of Si3N4 decreased the ablation resistance of the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yongxing Wei, Huawei Zhang, Siyuan Dong, Changqing Jin, Chenxing Bai, Junle Dai, Zengzhe Xi, Zhonghua Dai, Zengyun Jian, Li Jin
Summary: In this study, solid solutions of xBi(Ni1/2Hf1/2)O-3-(1 - x)PbTiO3 (xBNH-PT) were synthesized to investigate their phase boundary behaviors and physical properties. The presence of a tetragonal-pseudocubic phase boundary and a spontaneous ferroelectric-relaxor transition at specific compositions were confirmed. The introduction of a tetragonal-pseudocubic phase boundary improved the piezoelectric properties and suppressed the spontaneous ferroelectric-relaxor transition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
