Article
Engineering, Chemical
Yao Huang, Qiu-Yue Zhang, Qing Liao, Yan Chen, Xi Yan, Xiao-Jing Guo, Wan-Zhong Lang
Summary: The effect of Cr doping on the phase structure, microstructure, hydrogen permeation, and chemical stability of lanthanum tungstate was investigated. It was found that with the increase in Cr content, the hydrogen permeation flux also increased. The membrane with x = 0.2 showed the highest hydrogen permeation flux due to its higher oxygen vacancy concentration, and exhibited good stability during a 104-hour hydrogen permeation test.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Yao Huang, Gao-Feng Shi, Qing Liao, Yan Chen, Xi Yan, Xiao-Jing Guo, Wan-Zhong Lang
Summary: Mixed protonic-electronic ceramic lanthanum tungstate membranes were developed by doping Mn and Mo ions, resulting in improved H2 permeation flux. Additionally, the introduction of a moderate amount of Mo ions helped to achieve a single phase structure in the membranes.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Jacob A. Wrubel, Jeffrey Gifford, Zhiwen Ma, Hanping Ding, Dong Ding, Tianli Zhu
Summary: Y-doped BaZrO3 is a promising electrolyte material for solid oxide electrolysis cells, but further doping with Ce and/or Yb can improve conductivity and sintering properties at the cost of faradaic efficiency. Reduction of lattice Ce in the hydrogen electrode may lead to decreased faradaic efficiency by consuming hydrogen produced by the hydrogen evolution reaction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Guowei Weng, Song Lei, Rui Wang, Kun Ouyang, Jiale Dong, Xuanhe Lin, Jian Xue, Liang-Xin Ding, Haihui Wang
Summary: A high-efficiency ammonia synthesis technology has been developed using a CO2-tolerant La5.5WO11.25 d (LWO) membrane reactor, which improves the electrocatalytic nitrogen reduction reaction performance by coupling with hydrogen purification at intermediate temperatures. The produced protons from molecular hydrogen can be used for in situ ammonia synthesis through nitrogen hydrogenation. This promising electrochemical membrane reactor achieves superior ammonia synthesis performance with the highest Faradaic efficiency (FE) of 43.8% and corresponding ammonia rate of 231.1 mg h-1 cm -2 at 350°C. It provides a feasible direction to promote the development of the ammonia synthesis industry.
Article
Chemistry, Physical
Donglin Han, Xin Liu, Tor Svendsen Bjorheim, Tetsuya Uda
Summary: Increasing Ce content in Y-doped BaZrO3, BaCeO3, and their solid solutions stabilizes protons, increases oxide ion conductivity, and decreases hole conduction, thereby enhancing the ionic conduction of BZCY20 for improved performance in fuel cells and electrolysis cells.
ADVANCED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Xihan Tan, Zhangfeng Shen, Awais Bokhari, Muhammad Abdul Qyyum, Ning Han
Summary: This article discusses the principle, preparation method, and application of perovskite-type proton conductor hydrogen permeable membrane. It also explores the development trend of this material.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Materials Science, Ceramics
D. Ciria, M. Jimenez-Melendo, V. Aubin, G. Dezanneau
Summary: The high-temperature mechanical properties of yttrium-doped barium zirconate obtained by two different routes are investigated in this study. The material shows a gradual transition from brittle-to-ductile behavior as temperature increases and/or strain rate decreases during compression tests.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Engineering, Chemical
Ning Han, Wei Zhang, Wei Guo, Sijie Xie, Chi Zhang, Xuan Zhang, Jan Fransaer, Shaomin Liu
Summary: This study investigated the synthesis and properties of La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) hollow fiber perovskite membranes with wrinkled surface, demonstrating their applicability for oxygen separation. The results showed that the wrinkled membranes had higher oxygen permeation flux after Ag deposition as the catalyst.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Jilong Wang, Yaqi Fan, Jingang Jiang, Zheng Wan, Shuyue Pang, Yejun Guan, Hao Xu, Xiao He, Yanhang Ma, Aisheng Huang, Peng Wu
Summary: Membrane separation is an energy-efficient and environmentally friendly process that can achieve highly permeable and selective mixture separation. Two-dimensional molecular sieving membranes with unique nanopores and low transport resistance are desirable, but limited by the availability of recognized zeolite nanosheets. A newly reported swollen layered zeolite, ECNU-28, with high hydrogen selectivity offers promise for hydrogen purification and greenhouse gas capture.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Muneeb Irshad, Mehak Khalid, Muhammad Rafique, Naveed Ahmad, Khurram Siraj, Rizwan Raza, Muhammad Sadiq, Muhammad Ahsan, Abdul Ghaffar, Amina Ashfaq
Summary: The BaCo0.Fe-4(0).4Zr0.2-xNixO3-δ perovskite cathode material was successfully synthesized using a combustion method and sintered at low temperature, with the addition of nickel enhancing densification and grain growth at 1200 degrees C. XRD analysis showed a single phase and increased crystalline size, SEM micrographs displayed a dense microstructure with higher nickel concentration, and TGA analysis indicated thermal stability within the SOFC temperature range with minimal weight loss. The most promising electrical properties were observed for BaCo0.Fe-4(0).4Zr0.2-xNix (x = 0.04) due to increased densification and electronic defects, while a cell using BaCo0.Fe-4(0).4Zr0.2-xNix (x = 0.02) achieved the highest power density of 0.47 W cm(-2) attributed to its permeable and well-connected structure.
Article
Engineering, Chemical
Yonghong Wang, Yi Zhou, Xinru Zhang, Yin Gao, Jinping Li
Summary: By incorporating microporous sodium zeoliteY (NaY) into sulfonated poly (ether ether ketone) (SPEEK), mixed-matrix membranes (MMMs) for CO2/N2 separation were successfully engineered with improved gas separation properties. The even distribution of NaY particles in the SPEEK matrix forming nanochannels enhanced CO2 permeability and selectivity, leading to superior separation performance compared to pristine SPEEK membranes.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Do Young Kim, Seungbo Ryu, Hyoung-Juhn Kim, Hyung Chul Ham, Hyuntae Sohn, Sung Pil Yoon, Jonghee Han, Tae-Hoon Lim, Jin Young Kim, Seung Woo Lee, Chang Won Yoon, Sun Hee Choi
Summary: In this study, a hydrogen-selective membrane based on asymmetric polybenzimidazole (PBI) demonstrated high permeability and permselectivity. The addition of LiCl increased polymer chain density, solution concentration, and stability of the membrane structure.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Physical
Yuxin Yang, Xinzhong Li, Xiao Liang, Ruirun Chen, Jingjie Guo, Hengzhi Fu, Dongmei Liu
Summary: Thin Pd membranes with a thickness of about 2 μm were prepared by a two-step electroless plating method on porous ceramic supports. The membranes exhibited stable and high hydrogen permeation flux and selectivity under different operating conditions. The effect of gas mixtures on the hydrogen permeation flux was studied, and the membranes also showed good resistance to attrition.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Chemistry, Analytical
Hongda Cheng
Summary: Membrane technology is an advanced method for hydrogen separation that plays a significant role in achieving the hydrogen economy. Rare earth tungstate membranes, with their high hydrogen permeability and exceptional mechanical/chemical stability, have promising applications in hydrogen separation. This review provides an overview of the basic aspects and research progress of rare earth tungstate hydrogen separation membranes, including their crystal structure, proton transport properties, and membrane stability in a chemical atmosphere. Different membrane construction designs, such as single-phase, dual-phase, and asymmetric rare earth tungstate membranes, are also summarized. Lastly, the review discusses the current problems and offers development suggestions for tungstate membranes.
Article
Environmental Sciences
Ahmad Naquash, Muhammad Abdul Qyyum, Yus Donald Chaniago, Amjad Riaz, Fatma Yehia, Hankwon Lim, Moonyong Lee
Summary: This study evaluated membrane-assisted (case-I) and cryogenic-assisted (case-II) hydrogen (H2) separation and purification technologies in terms of energy, exergy, and economic aspects. The results showed that case-I had lower energy consumption, higher exergy efficiency, but higher cost than case-II. This study can assist industry practitioners and academic researchers in selecting optimal H2 separation and purification technologies.
Review
Chemistry, Physical
Ragnar Kiebach, Steven Pirou, Lev Martinez Aguilera, Astri Bjornetun Haugen, Andreas Kaiser, Peter Vang Hendriksen, Maria Balaguer, Julio Garcia-Fayos, Jose Manuel Serra, Falk Schulze-Kueppers, Max Christie, Liudmila Fischer, Wilhelm Albert Meulenberg, Stefan Baumann
Summary: Oxygen transport membranes (OTMs) are a promising technology for oxygen production, offering lower costs and power consumption compared to cryogenic air separation or pressure swing adsorption. Dual-phase OTMs, composed of a stable ionic conductor and electronic conductor composite, have advantages over single-phase membranes in terms of chemical and mechanical stability. However, challenges remain in their large-scale employment.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Wendelin Deibert, Mariya E. Ivanova, Yuanye Huang, Rotraut Merkle, Joachim Maier, Wilhelm A. Meulenberg
Summary: Protonic ceramic fuel cells show high potential for efficient energy production, with multilayer structures used to optimize electrolyte thickness and performance. The study demonstrates the fabrication process of cells using sequential tape-casting, with detailed characterization of starting powders and thermal behavior during heat treatment. The research also reveals the formation of a BaY2NiO5 transient liquid phase during cell heat treatment, showcasing competitive proton conductivity values at 600 degrees C.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Liudmila Fischer, Kerstin Neuhaus, Christina Schmidt, Ke Ran, Patrick Behr, Stefan Baumann, Joachim Mayer, Wilhelm A. Meulenberg
Summary: Reactive sintering of Ce0.8Gd0.2O2-δ-FeCo2O4 composites leads to the formation of desired mixed ionic electronic conductivity, with the specific microstructure playing a crucial role in membrane performance.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Electrochemistry
Kwati Leonard, Yuji Okuyama, Mariya E. Ivanova, Wilhelm A. Meulenberg, Hiroshige Matsumoto
Summary: Acceptor-doped barium zirconate cerate electrolytes have potential applications in highly efficient and environmentally friendly electrochemical devices. By optimizing the ionic conductivity, the Ba(ZrxCe10-x)(0.08)Y0.2O3-delta (1 <= x <= 9) material shows superior conductivity for moderate temperature electrolysis.
Article
Engineering, Chemical
Fabio C. Fonseca, Michael Mueller, Falk Schulze-Kueppers, Stefan Baumann, Wilhelm A. Meulenberg, Olivier Guillon, Reginaldo Muccillo, Sabrina G. M. Carvalho, Eliana N. S. Muccillo
Summary: The aligned pore structure improved the conductivity of the ceramic matrix and facilitated the infiltration of molten carbonate, enhancing the overall electrical conductivity of the composite membrane. The optimized procedure for producing membranes for carbon dioxide separation is proposed to be the infiltration of molten sodium-lithium carbonate in gadolinium-doped ceria prepared by the freeze-drying technique.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Physical
Kwati Leonard, Mariya E. Ivanova, Andre Weber, Wendelin Deibert, Wilhelm A. Meulenberg, Tatsumi Ishihara, Hiroshige Matsumoto
Summary: Solid oxide protonic fuel cells are efficiently converted stored chemical energy to usable electrical energy. This paper presents a cost-effective method for fabricating large-sized planar protonic fuel cells using inverse tape casting and screen printing. The cells exhibited defect-free single cells with suitable density and gas-tight electrolyte layers. The electrochemical performance of the cells based on SrZr0.5Ce0.4Y0.1O2.95 was evaluated and showed promising results.
SOLID STATE IONICS
(2022)
Article
Crystallography
Hartmut Schlenz, Stefan Baumann, Wilhelm Albert Meulenberg, Olivier Guillon
Summary: The aim of this work is to predict suitable chemical compositions for the development of new ceramic oxygen gas separation membranes, avoiding doping with toxic cobalt or expensive rare earths. By evaluating experimental data, determining missing crystallographic information using bond-valence modeling, and utilizing machine learning to generate training data sets, suitable compositions of cubic perovskite-type phases can be predicted, achieving higher electronic and oxygen conductivities for practical applications.
Article
Biochemistry & Molecular Biology
Kai Wilkner, Robert Muecke, Stefan Baumann, Wilhelm Albert Meulenberg, Olivier Guillon
Summary: In this study, a sensitivity analysis was conducted using a 1D transport model to identify the key parameters for oxygen transport membranes. The results showed that the ambipolar conductivity of the material and the total pressure in the gas phase were related to the limitations of oxygen transport. This model is useful for guiding the development of high-performance gas separation membranes.
Article
Chemistry, Physical
Maria Balaguer, Yoo Jung Sohn, Dietmar Kobertz, Sergey Kasatikov, Andrea Fantin, Michael Mueller, Norbert H. Menzler, Olivier Guillon, Mariya E. Ivanova
Summary: Innovations in materials science are crucial for addressing technological challenges, requiring the design of materials with tailored properties. This study developed ceramic materials in the BaZr0.8Y0.2-xMnxO3-delta series, finding that thermal expansion and hydration decrease, and total electrical conductivity reduces with increasing Mn content. XPS analysis and NEXAFS indicated varying oxidation states of Mn atoms depending on ambient conditions, suggesting a hydration mechanism mediated by Mn oxidation and proton attachment to oxygen neighbors.
SOLID STATE IONICS
(2022)
Article
Materials Science, Ceramics
W. Deibert, M. E. Ivanova, K. Ran, J. Mayer, W. A. Meulenberg
Summary: Mixed protonic and electronic conducting ceramic membranes have great potential in separating pure hydrogen from gas mixtures. This work focuses on finding suitable compositions and optimized fabrication techniques, as well as characterizing the sintering behavior of the material.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Xinfang Li, Elena Yazhenskikh, Sonja M. Gross-Barsnick, Stefan Baumann, Patrick Behr, Wendelin Deibert, Thomas Koppitz, Michael Mueller, Wilhelm A. Meulenberg, Ghaleb Natour
Summary: In this study, the thermal stability of a BaO-CaO-SiO2-B2O3 glass sealant (H) was investigated using differential scanning calorimetry (DSC). The crystallization behavior of glass H was examined through experimental X-ray diffraction (XRD) analysis and thermodynamic simulation with FactSage. The influence of Sr2SiO4 filler on the thermal expansion and microstructures of glass-Sr2SiO4 composites was also studied using dilatometry and scanning electron microscopy (SEM). The reinforced 20 wt% Sr2SiO4 composite (HS2S20) showed excellent properties, and its joining performance with SrTi0.75Fe0.25O3-delta (STF25) and Aluchrom as oxygen transport membranes (OTM) was investigated, with the best joining temperature found to be 920 degrees C for HS2S20 sealant.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Biochemistry & Molecular Biology
Hong Huang, Ziyue Guo, Remzi Can Samsun, Stefan Baumann, Nikolaos Margaritis, Wilhelm Albert Meulenberg, Ralf Peters, Detlef Stolten
Summary: This study aims to adapt a solid oxide cell (SOC) to a membrane reactor for general chemical reactions. A proof-of-concept reactor is tested for syngas production using oxygen ion transport membranes (ITMs) for oxygen separation. ANSYS Fluent is used for CFD simulations, and results show that the oxygen permeation rate depends on various factors.
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)
