Article
Chemistry, Physical
Simei Zhai, Peng Liu, Guoguang Yao, Shuaishuai Zhang, Jingxiang You
Summary: Three oxyfluoride ceramics, Li4NbO4F, Li4MgNbO5F, and Li6.5MgTiNbO8F1.5, were successfully prepared via solid-state reaction method, showing outstanding microwave dielectric properties and potential as candidates for low temperature co-fired ceramic technology.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Yun Sun, Jiangtao Wu, Ying Tang, Huaicheng Xiang, Jie Li, Liang Fang
Summary: X-ray diffractometer with Rietveld refinement and Raman spectroscopy were used for phase analysis. Ca doping leads to a decrease in epsilon(r), Q × f, and tau(f), which does not conform to the mutual constraint relationship among the three parameters of microwave dielectric properties. The epsilon(r) of Ce1-xCaxO2-x ceramics is affected by the ion polarizability and the rattling and valence states of Ce cations, with rattling playing a dominant role. The presence of oxygen vacancies in Ce1-xCaxO2-x ceramics explains the decrease in Q × f, and tau(epsilon), epsilon(r), and alpha(L) are responsible for the decrease in tau(f), especially for the tau(alpha m)-3 alpha(L) values.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Xiaoqing Chen, Hao Li, Pengcheng Zhang, Houlin Hu, Yu Tao, Gaosheng Li
Summary: A low-firing SrZnV2O7 ceramic was synthesized using a traditional solid-state sintering method, with detailed studies on phase formation, grain morphology, and dielectric performance. The results showed that SrZnV2O7 has potential applications in LTCC technology.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Lian Duan, Jiangyu Zhang, Jie Li, Huaicheng Xiang, Ying Tang, Xianrong Luo, Liang Fang
Summary: In this study, hexagonal La2O3 and monoclinic Eu2O3 ceramics were prepared and their microwave dielectric properties were investigated. La2O3 sintered at 1400 degrees C exhibited promising microwave dielectric properties, while Eu2O3 sintered at 1500 degrees C possessed relatively lower values. The difference in their properties is mainly due to lattice-induced strain, which can be characterized by bond valence. Moreover, the introduction of Eu3+ effectively prevents the decomposition of La2O3.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Yang Yang, Yifan Zhai, Huaicheng Xiang, Jie Li, Ying Tang, Liang Fang
Summary: In this study, two cubic garnet ceramics Ca3TiBGe3O12 (B = Mg, Zn) were prepared with optimal sintering temperatures. Both ceramics exhibited promising microwave dielectric properties and low coefficient of thermal expansion. The analysis also revealed the compression of Ca2+ ions at the A-site, rattling of Ge4+ ions at the C-site, and the coexistence of compressed Mg2+/Zn2+ ions with rattling Ti4+ ions at the B-site.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Haonan Cui, Hongcheng Yang, Hua Wang, Yixuan Zheng, Yuchen Wang, Hongyu Yang, Enzhu Li
Summary: CaO-Al2O3-B2O3 (CAB) glass-ceramics with varying Al2O3 content were prepared using the melting method. The samples exhibited good crystallization, dielectric properties, and sintering behavior.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Yan-Bo Guo, Kang Du, Chang-Zhi Yin, Jia-Qing Yang, Wei Luo, Fei Wang, Wen-Zhong Lu, Wen Lei
Summary: Al2-xScxMo3O12 (x = 0 - 0.6) ceramics were synthesized by a solid-state reaction. The doping of Sc3+ can adjust the phase transition temperature and improve the microwave dielectric properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Jinyan Ma, Junqi Chen, Huaicheng Xiang, Jie Li, Ying Tang, Liang Fang
Summary: Gallium-based melilite ceramics were prepared and modified to have desirable microwave dielectric properties. The ceramics exhibited high relative densities, low dielectric constants, and negative temperature coefficients. The addition of a compensator effectively adjusted the temperature coefficients to near zero.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Qianbiao Du, Ying Tang, Jie Li, Weishuang Fang, Aihong Yang, Junqi Chen, Liang Fang
Summary: The novel low-temperature co-fired ceramic Li2SrSiO4 exhibits low epsilon(r) and high Q values, with a weak covalency of Si-O bond contributing to its low sintering temperature. The addition of SrTiO3 further enhances its quality factor, making it a potential dielectric material for LTCC applications due to its chemical compatibility with Ag powders.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Changzhi Yin, Kang Du, Zhengyu Zou, Xiaoqiang Song, Ying Xiong, Fei Wang, Meng Zhang, Weicheng Lei, Yaodong Liu, Wenzhong Lu, Chunchun Li, Wen Lei
Summary: Researchers synthesized a novel microwave dielectric ceramic of SrGa2Si2O8 using the traditional solid-state method and characterized its phase composition, microstructure, and microwave dielectric properties. The ceramic exhibited good microwave dielectric properties at 1260 degrees C, with an er of 6.3, Qxf of 96,600 GHz, and τf of -45.2 ppm/degrees C at 16.5 GHz. By adding 15 mol% of CaTiO3, the negative τf could be tuned to near zero. Additionally, the densification temperature could be reduced to 940 degrees C by adding 4 wt% LiF. The ceramic also had good chemical compatibility with the Ag electrode. A patch antenna designed using the ceramic showed high radiation efficiency and gain, indicating the potential application of SrGa2Si2O8 ceramic in 5G wireless communication technology.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Yun Zhang, Xiaoning Li, Shihua Ding, Tianxiu Song, Zezhen Yin, Jiaying Dan
Summary: Ba1-xLixSi2O5-x/2 (x = 0-0.5) ceramics were prepared by solid-state reaction method. The occupation tendency of Li+ was explained based on First-principle calculation and unit cell volume changes. Li+ substitution for Ba2+ reduced sintering temperature and improved the structural characteristics, leading to enhanced Qxf and reduced dielectric constant er. Ba0.99Li0.01Si2O4.995 ceramic exhibited a high Qxf value of 25,518 GHz, with er and tfvalues of 6.94 and -29.46 ppm/℃, respectively.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Ceramics
Xin Chu, Juan Jiang, Jinzhao Wang, Yuanchuang Wu, Lin Gan, Tianjin Zhang
Summary: A novel microwave dielectric ceramic material, Li4NbO4F, was fabricated via solid-state reaction, exhibiting outstanding microwave dielectric properties and homogenous microstructures which can be successfully sintered at low temperatures. The optimal properties were achieved in a sample sintered at 825 degrees C. Additionally, it showed superior compatibility with Ag, indicating its potential as a promising low temperature co-fired ceramic material.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Xiaowen Hu, Jinwu Chen, Jie Li, Huaicheng Xiang, Ying Tang, Liang Fang
Summary: Two zircon-structured ceramics AEuV2O8 (A = Bi, La) exhibited contrasting performances with regards to their microwave dielectric properties. BiEuV2O8 showed higher dielectric constant, lower Q x f, and larger temperature coefficient compared to LaEuV2O8.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Xianqiang Chen, Binfeng Zhao, Naichao Chen, Jin Cheng, Mingzhao Dang, Feng Wang, Xinwei Xu, Hong Wang
Summary: Nano-sized CaF2 powders synthesized using a wet chemical method enable low-temperature sintering and superior microwave dielectric properties. The addition of LiF as a sintering aid further improves the microwave dielectric properties of CaF2 ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Houlin Hu, Yao Wang, Chaoyang Cai, Pengcheng Zhang, Xiaoqing Chen, Rui Xiang, Hao Li
Summary: A novel low-temperature fired BaMnV2O7 ceramic with monoclinic structure was fabricated and found to exhibit good chemical stability and desirable microwave dielectric performance at 850 degrees C. The increasing content of V4+ was shown to affect the quality factor based on X-ray photoelectron spectroscopy analysis.
CERAMICS INTERNATIONAL
(2021)
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)