Article
Chemistry, Multidisciplinary
Qian Chen, Shuyao Cao, Wei Song, You Xie, Zhengxin Yan, Jie Xu, Feng Gao
Summary: High ZT is highly desirable for tungsten bronze structure material. The anisotropic thermoelectric properties of KSr2Nb5O15 were studied using first-principles calculations, and the results were consistent with experimental data. KSr2Nb5O15 textured ceramics prepared by reactive templated grain growth showed significant anisotropic thermoelectric properties, with much higher power factor along the 11c direction compared to the perpendicular to c direction. The mechanism of the anisotropy was also clarified. This research provides a basis for improving the thermoelectric performance of KSr2Nb5O15 ceramics.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Materials Science, Ceramics
Rebecca L. Walton, Michael J. Brova, Beecher H. Watson, Elizabeth R. Kupp, Mark A. Fanton, Richard J. Meyer, Gary L. Messing
Summary: Direct writing with anisotropic nozzles can significantly improve the alignment of tabular barium titanate template particles in a matrix powder, leading to enhanced texture in ceramics. COMSOL Multiphysics simulations show that torque distributions during direct writing directly affect the electromechanical properties of the printed ceramic materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Rohit Pratyush Behera, Syafiq Bin Senin Muhammad, Marcus He Jiaxuan, Hortense Le Ferrand
Summary: By using ultra-low magnetic fields combined with slip casting, it is possible to purposely orient magnetically responsive particles in any direction in ceramics. The textured ceramics obtained from bimodal slurries containing alumina nanoparticles and alumina microplatelets of various dimensions show anisotropic grains with controllable orientations, grain length of 3-7 μm, mild open porosity between 30-40%, and interesting cracking behavior, making them promising for filtering, biomedical, or composite applications.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Inorganic & Nuclear
M. Suganya, J. Kishor Kumar, S. Anand, K. Mohamed Racik, S. Muthupandi, S. Muniyappan, S. Nandhini
Summary: This work presents the supercapacitor performance of Z-type barium hexaferrite nanoplatelets prepared by citrate-nitrate auto combustion method. The study confirms the excellent magnetic and electrochemical properties of these nanoplatelets, suggesting their potential use in energy storage devices.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Yaqing Ma, Linjing Liu, Hang Xie, Zerui Zhang, Qiangwei Kou, Rui Lv, Bin Yang, Yunfei Chang, Fei Li
Summary: In this study, the piezoelectric response of (Bi0.5Na0.5)TiO3 (BNT)-based ceramics was enhanced by exploring piezoelectric anisotropy and domain engineering in composition and microstructure-controlled textured ceramics. The textured ceramics exhibited more ordered domains and facilitated domain switching behavior, resulting in significantly enhanced piezoelectric properties compared to non-textured counterparts.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2024)
Article
Chemistry, Inorganic & Nuclear
Yunjing Shi, Xiaoyu Dong, Bo Shen, Jiwei Zhai
Summary: In this study, the piezoelectric properties of 0.7BFBT-T were enhanced through quenching. A suitable quenching temperature increased the content of the rhombohedral phase, leading to a highly distorted structure and magnification of the dipole moment, which was beneficial for enhancement of the polarity. Furthermore, quenching inhibited oxygen vacancies and increased the size and orderliness of domains, reducing the pinning effect.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Materials Science, Ceramics
Ping Zhang, Mengjie Qin, Zhihao Lou, Shuyao Cao, Lingyun Gong, Jie Xu, Michael John Reece, Haixue Yan, Zinovi Dashevsky, Feng Gao
Summary: Textured ceramics of Sr0.9La0.1TiO3 were successfully fabricated using the reactive template grain growth method. The ceramics exhibited low lattice thermal conductivity and improved thermoelectric properties due to the enhanced phonon scattering by multi-scale boundaries and interfaces.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Mohammadamin Moghadasi, Alireza Mahdaviarab, Anna-Katharina Hofer, Raul Bermejo, Zhijian Pei, Chao Ma
Summary: In this study, textured ceramics were obtained using press-compaction-assisted binder jetting for the first time. The effect of nanoplatelet fraction on sintered density, texture and biaxial flexural strength of the ceramics was investigated.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Josef Schlacher, Tamas Csanadi, Marek Vojtko, Roman Papsik, Raul Bermejo
Summary: The enhanced fracture resistance of textured alumina is attributed to crack deflection along grain boundaries. This study quantifies and compares the micro-scale fracture toughness of textured alumina grains and grain boundaries using micro-bending tests and finite element analysis. The results show that the micro-scale fracture toughness of the textured alumina grain boundaries is about 30% lower than that of the grains. These findings are crucial for understanding the macroscopic fracture behavior of textured alumina ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Dae-Su Kim, Jae-Min Eum, Su-Hwan Go, Ho-Sung Shin, Hero Kim, Seok-June Chae, Sun-Woo Kim, Eun-Ji Kim, Jong-Un Woo, Sahn Nahm
Summary: Thick films of 0.96(K0.5Na0.5)(Nb1-ySby)O-3-0.04SrZrO(3) [KN(N1-ySy)-SZ] were textured using NaNbO3 templates, showing promising piezoelectric properties. A thick film with 3.0 mol% NaNbO3 seed exhibited high d(33) values and excellent thermal stability, making it a suitable candidate for piezoelectric energy harvesters.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Su-Hwan Go, Yeon-Gyeong Chae, Seok-June Chae, Eun-Ji Kim, Hyeon-Min Yu, Wan-Ho Cho, Sahn Nahm
Summary: A [001]-textured KNNS-0.02CZ-0.02ABZ piezoceramic with a large d(33) value was found, which shows great potential for loudspeaker applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Inorganic & Nuclear
Cecilie G. Knudsen, Mathias I. Morch, Mogens Christensen
Summary: In this study, a simple synthesis process was used to align crystallites of W-type hexaferrites without applying magnetic field or hot compaction. The alignment was achieved by taking advantage of the easy alignment of non-magnetic, anisotropic-shaped precursor crystallites of goethite.
DALTON TRANSACTIONS
(2023)
Article
Nanoscience & Nanotechnology
Qiangwei Kou, Bin Yang, Haobin Lei, Shuai Yang, Zerui Zhang, Linjing Liu, Hang Xie, Yuan Sun, Yunfei Chang, Fei Li
Summary: Lead-free ceramics with superior piezoelectric performance are synthesized by a synergistic design strategy of integrating crystallographic texture, multiphase coexistence, and doping engineering, without sacrificing the Curie temperature. This work provides important guidelines for developing novel ceramics with outstanding piezoelectric properties and can largely expand application fields of textured BaTiO3-based ceramics into high-performance and multilayer electronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
Liangliang Liu, Xinyu Jiang, Yan Wang, Yanqing Liu, Zhaoping Hou, Yongmei Zhang
Summary: A strategy was proposed to improve the texture degree and density of ceramics simultaneously by a grain-orientation-engineered technique. Template layers without mixed matrix were prepared by the brushing technique to solve the problem of directional arrangement of template particles. Dense textured NaSr2Nb5O15 ceramics with grain size gradient distribution were designed by the lamination of template and matrix layers. Moreover, an evaluation method of texture degree was developed, and ferroelastic and ferroelectric domains were observed simultaneously in the oriented grains.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Bai Jiawei, Yang Jing, Lu Zhenfei, Tang Xiaodong
Summary: The B-site doping of Ti4+ ions can affect the magnetic properties of M-type hexaferrite, leading to a decrease in magnetization at low Ti concentrations but an increase in saturation magnetization with higher Ti doping levels. Additionally, Ti4+ doping can induce semiconductor behavior in the grains, resulting in low frequency dielectric enhancement with Maxwell-Wagner dielectric relaxation.
JOURNAL OF INORGANIC MATERIALS
(2021)
Article
Chemistry, Physical
Fei Jin, Duojie Wu, Yani Lu, Zizhao Pan, Meng Gu, Hong Wang
Summary: In this work, oxygen vacancy-regulated La0.7Ca0.3MnO3-delta:Ag (LCMO:A) nanocomposite thin films were synthesized and investigated for their high temperature coefficient of resistance (TCR) values. The effects of oxygen pressures on the lattice parameter, T-p value, and Mn4+ concentration in the films were studied. The LCMO:A nanocomposite thin film prepared with optimal oxygen pressures exhibited a record high TCR value of approximately 37% K-1, making it a promising candidate for applications in bolometers.
JOURNAL OF MATERIOMICS
(2022)
Article
Materials Science, Multidisciplinary
Jingxia Huang, Xiaobin Tang, Feng Wang, Zehuan Wang, Yujuan Niu, Hong Wang
Summary: In this study, a capacitive pressure sensor based on PVDF/rGO multilayer films with multi-hierarchical microstructures is designed and constructed to improve linearity. By optimizing the microstructure and roughness, the sensor achieves excellent performance in terms of sensitivity, limit of detection, response time, and stability.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Chemistry, Physical
Jing Guo, Mingming Si, Xuetong Zhao, Li Wang, Ke Wang, Jianyu Hao, Hong Wang, Clive A. Randall
Summary: This study successfully integrated C-60 with ZnO using a cold sintering process, forming thin C-60 layers at the ZnO grain boundaries and significantly improving the electrical properties of the material.
Article
Engineering, Environmental
Liuting Li, Jiufeng Dong, Renchao Hu, Xianqiang Chen, Yujuan Niu, Hong Wang
Summary: In this study, the introduction of calcium fluoride nanoparticles into polyimide films was found to increase the permittivity and power density, while reducing conduction loss. This novel fluoride nanofiller shows great potential for improving energy storage in high-temperature composites.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Huajing Fang, Liangliang Wu, Hailong Ma, Wenting Wu, Lingqi Wu, Yue Zhang, Hong Wang
Summary: This study presents a dual-function biomimetic eye based on a photoelectrochemical device, which integrates light intensity detection and light transmission adjustment. The rational design of interfaces and electrolyte enables stable operation in harsh environments, offering potential applications in bionic devices.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Ceramics
Jianyu Hao, Jing Guo, Changli Fu, Mingming Si, Xian Xue, Xiaomeng Li, Hong Wang
Summary: This study investigates the cold sintering process of Na2WO4 ceramics using Na2WO4·2H2O dry powders as the liquid phase. The effects of sintering parameters on the CSP are systematically studied, and the optimum cold sintering conditions are determined.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Binfeng Zhao, Xianqiang Chen, Naichao Chen, Xinwei Xu, Yani Lu, Jin Cheng, Hong Wang
Summary: With the development of 5G/6G communication, the demand for low-temperature co-fired ceramic (LTCC) has become increasingly important. In this study, the addition of a sintering aid successfully lowered the sintering temperature of ceramics, making them suitable for LTCC technology and potential candidates for 5G/6G applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Robotics
Daiyue Wei, Quan Xiong, Jiufeng Dong, Huacen Wang, Xuanquan Liang, Shiyu Tang, Xinwei Xu, Hongqiang Wang, Hong Wang
Summary: This study successfully develops nanocomposite films with high dielectric constant and low loss by accumulating charges at the matrix-filler interfaces, enhancing the force. Additionally, ultra-thin and lightweight EA clutches are fabricated with low power consumption and high load-bearing capacity. The extensive applications of this technology in the field of robotics are demonstrated through the display of a dexterous robotic hand.
Article
Materials Science, Multidisciplinary
Long Teng, Li Li, Jingxia Huang, Shuai Li, Renchao Hu, Xuechang Zhou, Hong Wang
Summary: This study presents a fully recyclable transient electronic device that can destroy circuits upon thermal trigger and recycle electronic components with high efficiency, offering new possibilities for sustainable electronic devices.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Physical
Renchao Hu, Desheng Pan, Xinwei Xu, Bin Xiao, Hong Wang
Summary: This study synthesized Fex(CoyNi1-y)100-x particles with two phases (face-centered cubic (FCC) and hexagonal close-packed (HCP)) and found that they exhibit excellent electromagnetic wave absorption, suitable for addressing electromagnetic interference in 5G networks in both centimeter-wave and millimeter-wave bands, with a wide bandwidth range and remarkable absorption performance.
JOURNAL OF MATERIOMICS
(2023)
Article
Chemistry, Multidisciplinary
Fei Jin, Yuanming Zhu, Li Li, Zizhao Pan, Desheng Pan, Meng Gu, Qian Li, Lang Chen, Hong Wang
Summary: High-entropy strategy is used to fabricate an ultra-thin spinel ferrite film with superior saturation magnetization, low coercivity, excellent resistivity, and switchable magnetic anisotropy, which is of great significance for the development of high-density memory devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Zizhao Pan, Li Li, Lina Wang, Guangfu Luo, Xinwei Xu, Fei Jin, Jiufeng Dong, Yujuan Niu, Liang Sun, Chuanfei Guo, Wenqing Zhang, Qing Wang, Hong Wang
Summary: This study reported the control of energy level of charge traps in polymer film capacitors by tailoring molecular structures, leading to significant inhibition of charge loss at high temperatures. The optimized crosslinking structure exhibited ultrahigh discharged energy density and high charge/discharge efficiencies, along with excellent cyclability and self-healing features.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yujuan Niu, Ruixin Zhang, Jiufeng Dong, Zizhao Pan, Hong Wang
Summary: In recent years, there has been an increasing demand for high temperature-resistant dielectrics due to the growing need for power supply in harsh environments. However, polymer-based composites with high glass-transition-temperature polymers face challenges in achieving homogeneous dispersion of fillers. This study focuses on the design and preparation of poly-etherimide (PEI)-based nanocomposites filled with modified BT nanoparticles. The nanocomposites, mBT/PEI, exhibit improved dielectric and energy storage performance, with a maximum energy density of 4.2 J cm-3 at 2 vol%, which is 31% higher than that of the nanocomposite BT/PEI without surface modification.
Article
Chemistry, Physical
Zizhao Pan, Yupeng Pan, Li Li, Xinwei Xu, Jiufeng Dong, Fei Jin, Liang Sun, Yujuan Niu, Chen Xu, Hong Wang
Summary: By introducing high contents of medium-polar ester group and end-group (St) modification into a biodegradable polymer polylactic acid (PLA), the loss can be synergistically reduced and the energy storage density (Ue) and charge-discharge efficiency (h) can be enhanced. The modified PLA polymer (PLA-St) exhibits an Ue of 6.5 J/cm(3) with an ultra-high h (95.4%), outperforming the best reported dielectric polymers. The modified molecular structures generate deep trap centers and restrict the local dipole motions, resulting in reduced conduction loss and improved high-temperature capacitive performance. Additionally, the PLA-St polymer shows excellent self-healing ability and cyclic stability surviving over 500,000 charge-discharge cycles. This work provides an efficient route to next-generation eco-friendly dielectric polymers with high energy density, low loss, and long-term stability.
JOURNAL OF MATERIOMICS
(2023)
Article
Materials Science, Ceramics
Xiaomeng Li, Xian Xue, Qiyin Lin, Zeming Qi, Hong Wang, Yingying Zhao, Jing Guo
Summary: This work presents temperature stable xLi2MoO4-(1-x)(LiBi)0.5MoO4 (x = 0, 40, 50, 60, 70, 100 vol%) microwave dielectric ceramics obtained by cold sintering process under mild sintering conditions. The ceramics exhibit high relative densities and good microwave dielectric properties, with TCF = +0.7 ppm/degrees C obtained at x = 50 vol%. The dielectric responses are dominated by polar optical phonons based on the fitted infrared reflectivity spectrum.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
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)
