Article
Chemistry, Physical
Chao Gao, Hongyu Liu, Jian Zhang, Zhongcheng Guo, Hui Huang
Summary: This paper proposes a simplified crystal grain boundary engineering method that can protect grain boundaries by infusing solid-state-electrolyte assisted with molten salt, and doping F- ions into the bulk of LNMO during annealing to expand the lattice parameter. The modified samples exhibit superior electrochemical properties, especially in harsh environments.
JOURNAL OF POWER SOURCES
(2023)
Article
Materials Science, Multidisciplinary
Jinhang Lv, Ruilin Zheng, Peng Lv, Wei Wei
Summary: The addition of a small amount of LiF to LAGP solid electrolyte can significantly improve the ionic conductivity and structural properties, as well as have a significant impact on the crystal transformation process.
ENERGY & ENVIRONMENTAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Youyou Zhang, Huibin Wu, Xinpan Yu, Jinxu Liu, Di Tang
Summary: Thermomechanical processing was used to optimize the grain boundary character distribution (GBCD) of a grain boundary engineered microstructure in a high-entropy alloy. The influence of annealing time and degree of tensile deformation on GBCD was investigated. The results show that a specific combination of tensile deformation and annealing time leads to the formation of desired GBCD. The degree of deformation has a significant impact on GBCD, where sufficient strain-induced boundary migration is more important than significant recrystallization.
MATERIALS CHARACTERIZATION
(2022)
Review
Chemistry, Multidisciplinary
Jichang Sun, Chuanbang Liu, Huaiyin Liu, Junwei Li, Penglun Zheng, Yun Zheng, Zhihong Liu
Summary: This review summarizes the recent advances in organic-inorganic composite solid electrolytes (CSE) with ordered architectures for solid-state lithium batteries. The study highlights the significant improvement in ionic conductivities achieved through the incorporation of ordered inorganic fillers in CSE. The review provides researchers with valuable insights for achieving ordered structures in CSE to enhance the performance of advanced solid-state lithium batteries.
Article
Materials Science, Ceramics
Pinar Kaya, Y. Eren Suyolcu, Peter A. van Aken, Servet Turan, Giuliano Gregori, Joachim Maier
Summary: The addition of Yb2O3 to Sm-bearing AlN ceramics significantly reduces thermal conductivity and increases grain boundary resistivity. On the other hand, the use of Sm2O3 as a sintering aid leads to an increase in electrical resistivity due to secondary phases at grain boundaries and triple junctions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Jian Tan, Mingxin Ye, Jianfeng Shen
Summary: Constructing a stable solid electrolyte interface (SEI) film consisting of nanocrystal inorganic compounds with numerous grain boundaries (GBs) is an effective solution to suppress the growth of Li dendrite. The role of GBs in the SEI film is crucial for the transport of Li+ ions.
MATERIALS TODAY ENERGY
(2021)
Article
Engineering, Chemical
Weijie Kou, Zibiao Guo, Wenpeng Li, Shiwei Liu, Junmei Zhang, Xinji Zhang, Wenjia Wu, Jingtao Wang
Summary: In this study, a LLZO/LIC LISE was fabricated by in-situ sintering LIC in the LLZO lamellar framework. The introduction of LIC effectively reduced the grain boundary resistance and improved the ionic conductivity of the solid electrolyte. The LLZO/LIC LISE showed high ionic conductance and exceptional energy density, surpassing most developed solid-state electrolytes. Evaluation of cell performance demonstrated superior cycling stability and capacity retention.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Theophilus Wallis, Reza Darvishi Kamachali
Summary: The role of grain boundaries (GBs) in determining the properties of polycrystalline materials is influenced by their structure and chemistry. In this study, we investigate the co-evolution of GB structure and segregation in Fe-Mn alloys. We find that the coupling between the chemical and structural states of GBs amplifies Mn segregation transition, even when the GB structure remains unchanged. When the GB structure is non-uniform, low- and high-Mn phases can coexist within the GB region. These findings provide insights into the structural sensitivity of GB segregation and the chemo-structural interplay.
Article
Chemistry, Physical
Aarthi Uthayakumar, M. Kavithanjali, K. Sandhya, N. Ponpandian, K. Suresh Babu
Summary: Introducing trivalent rare-earth dopants in barium cerate-zirconate solid solution can modulate grain boundary resistance and enhance protonic conductivity. Doping with smaller ionic radii allows for lower proton trapping sites, achieving higher conductivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Grazia Accardo, Ander Orue, Dimitrios Chatzogiannakis, Pawel Gluchowski, Montserrat Casas-Cabanas, Pedro Lopez-Aranguren
Summary: In this study, a two-step process to fabricate LLZO electrolytes with a high relative density under low temperature was proposed. The high-pressure low-temperature method was used to achieve high ionic conductivity, and the practical application was demonstrated through experiments on lithium stripping and plating. This research provides guidelines for controlling the microstructure of LLZO and contributes to the understanding of the correlations between microstructure and conductivity.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Yongjie Zhao, Chengzhi Wang, Yejing Dai, Haibo Jin
Summary: The study introduces a grain-boundary engineering strategy to stabilize the Na/Na3Zr2Si2PO12 interface and enhance sodium ion transfer capability at the interface. By mediating the chemical composition at the grain boundary of Na3Zr2Si2PO12 through the addition of sintering additive Na2B4O7, densification sintering at lower temperature is facilitated to boost sodium ion migration. The resulting all-solid-state batteries exhibit excellent cycling performance with enhanced stability and reduced interfacial resistance.
Article
Materials Science, Multidisciplinary
Jinxu Liu, Huibin Wu, Shanwu Yang, Manli Huang, Chao Ding
Summary: The optimization of grain boundary of compositionally complex Fe-Mn-Al-C-Cr Steel was achieved by low strain and annealing, leading to the formation of coincident site lattice (CSL) boundaries. Larger strain can promote grain recrystallization, disrupting the optimization process.
Article
Electrochemistry
Hernando J. Gonzalez Malabet, Yubin Zhang, James R. Salvador, Robert D. Schmidt, Thomas A. Yersak
Summary: This study investigates the crystallization kinetics of (oxy)sulfide solid-state electrolytes and demonstrates the fabrication of reinforced SSE separators using improved thermal stability. The microstructure of the separators can be modified without affecting ionic conductivity. It is found that hot-pressed separators are more susceptible to shorting.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Electrochemistry
Ruoyu Wang, Butian Chen, Chong Liu, Wen Yin, Huaican Chen, Jicheng Zhang, Tianran Zhang, Limei Sun, Xiangfeng Liu
Summary: The high ionic conductivity of LATP can be achieved by doping B3+ and Y3+ ions in a solid-state synthesis, which broadens the ion migration path, reduces the Li+ migration energy barrier, and weakens the electrostatic attraction between Li-O bonds.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Mohammed Sahal, Jie Molloy, Venkateshwaran Ravi Narayanan, Leila Ladani, Xiaochuan Lu, Nicholas Rolston
Summary: A high-throughput, open-air process for printable thin-film ceramic solid-state electrolytes, called robust LLTO, has been developed. The LLTO films exhibit remarkable mechanical properties and have the potential to enable the design of robust solid-state batteries.
Article
Materials Science, Multidisciplinary
Jinqiang Zhang, Liang Wang, Xiaoli Zhao, Lei Shi, Haijun Chen, Shu Zhang, Peng Zhang, Shuaijun Wang, Laichang Zhang, Yinfeng Wang, Xiaoyuan Wang, Yuezhao Zhu, Huayang Zhang, Xiaoguang Duan, Mingbo Wu, Guosheng Shao, Shaobin Wang, Hongqi Sun
Summary: Solar energy-induced catalysis plays a crucial role in plasmon-mediated photothermal catalysis and external heat-coupled photocatalysis, with the catalyst structure determining the quantum efficiencies. In this study, different catalysts (TiO2-P25 and Al2O3) and platinum quantum dots were used in photo, thermal, and photothermal catalytic dry reforming of methane. Experimental and computational results revealed different active sites for the three types of catalysis. The identified hot zones significantly enhance the photothermal catalytic reactivity. This study contributes to the understanding of photothermal catalysis and the development of efficient catalysts for solar energy utilization and fossil fuels upgrading.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Junwu Sang, Kangli Liu, Xiangdan Zhang, Shijie Zhang, Guoqin Cao, Yonglong Shen, Guosheng Shao
Summary: In this study, an economic method was developed to fabricate nanocomposites of crystalline few-layer graphene sheets loaded with ultrafine SnO2 nanocrystals. These nanocomposites exhibited significantly quickened redox processes as sodium ion battery anodes, leading to remarkable capacity and outstanding rate performance, even at high current densities.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Chemistry, Physical
Siyuan Zhao, Huayu Pei, Quan Yang, Kangli Liu, Yuanyuan Huang, Zhuo Wang, Guosheng Shao, Jinping Liu, Junling Guo
Summary: Low electrolyte/sulfur ratio is an important factor in increasing the energy density of lithium-sulfur batteries. By using catalytic hosts to suppress the shuttle effect, the E/S has been widely lowered. However, the shelf-life of these cathodes has not been studied. Our research reveals that the adsorption strength of commonly-used catalytic hosts is critical for effectively hindering the disproportionation of polysulfides.
Article
Chemistry, Physical
Jinjin Ban, Xiaohan Wen, Honghong Lei, Guoqin Cao, Xinhong Liu, Chunyao Niu, Guosheng Shao, Junhua Hu
Summary: Domain boundaries are important active sites for electrochemical energy storage materials. Layered double hydroxides tend to grow into single crystalline nano sheets, but efforts have been made to design hierarchical structures to provide more exposed electroactive sites. In this study, low angle grain boundaries were introduced into flakes of Ni/Co layered double hydroxides, resulting in defect-rich nano flakes that self-assembled into hydrangea-like spheres. These spheres further constructed a hollow cage structure. The formation of hierarchical structure and grain boundaries was explained by the synergistic effect of the Ni2+/Co2+ ratio. The battery-type electrode material fabricated from the NiCo-LDH-2 showed significantly enhanced specific capacitance and energy density.
Article
Materials Science, Multidisciplinary
Xiangdan Zhang, Yuanyuan Huang, Xiaoyi Hu, Ruxin Guo, Yongshang Zhang, Zhiheng Wu, Guoqin Cao, Yuran Yu, Zhuo Wang, Yonglong Shen, Guosheng Shao
Summary: This study proposes an effective approach in solid sodium ion batteries using Na11Sn2PS12 electrolyte and slurry-coated NASICON-type Na3MnTi(PO4)(3)@C high-voltage cathode, which is beneficial for cost reduction and high loading of active cathode material. By significantly improving the integrity of the electrolyte-cathode interface, these solid sodium ion batteries demonstrate outstanding cycling and rate performance, even operating at low temperatures.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Changfan Xu, Yulian Dong, Yonglong Shen, Huaping Zhao, Liqiang Li, Guosheng Shao, Yong Lei
Summary: This article reviews the recent advances in the chemical and electrochemical mechanisms of nonaqueous Na-CO2 batteries and hybrid Na-CO2 batteries, including O-2-involved Na-O-2/CO2 batteries. The primary issues and challenges in various battery components are identified, and design strategies for the interfacial structure of Na anodes, electrolyte properties, and cathode materials are explored. Correlations between cell configurations, functional materials, and comprehensive performances are established, and prospects and directions for rationally constructing Na-CO2 battery materials are foreseen.
Article
Chemistry, Multidisciplinary
Pengpeng Zhang, Yige Zhao, Yukun Li, Neng Li, S. Ravi P. Silva, Guosheng Shao, Peng Zhang
Summary: The electrocatalysts play an important role in improving the electrochemical performance of lithium-sulfur batteries by selectively accelerating the redox kinetics behavior of Li2S. However, the internal redox reaction routes and active sites in the Li-S battery are difficult to observe directly. This study developed a system that combines the light field and in situ irradiated X-ray photoelectron spectroscopy to convert the black box battery into a see-through battery, allowing for direct observation of charge transportation and revealing the mechanism of Li2S decomposition and nucleation.
Article
Chemistry, Multidisciplinary
Ruohan Hou, Yukun Li, Zheng Wang, Zuhao Shi, Neng Li, Fujun Miao, Guosheng Shao, Peng Zhang
Summary: The main obstacles for the commercial application of Li-S full batteries are the large volume change, shuttle effect of LiPS, sluggish redox kinetics, and the indisciplinable dendritic Li growth. This study proposes a design of CoSe@CCM as a dual-functional electrocatalyst for both cathode and anode regulation. The use of carbon chain-mail protects CoSe from corrosion and ensures high activity during long-term cycles, leading to high areal capacity and practical feasibility.
Article
Materials Science, Multidisciplinary
Changfan Xu, Jiajia Qiu, Yulian Dong, Yueliang Li, Yonglong Shen, Huaping Zhao, Ute Kaiser, Guosheng Shao, Yong Lei
Summary: This study presents the design of RuO2 nanoparticles encapsulated in carbon paper (RuCP) as both the anode and cathode for Na-CO2 batteries, showing outstanding performance in improving ion distribution and preventing dendrite formation, thereby enhancing the electrochemical kinetics and cycling stability of the battery.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Shuaiqiang Bi, Kangwei Xu, Guosheng Shao, Ke Yang, Jiajia Tian
Summary: Marine biofouling is a global challenge that requires urgent solutions. Researchers have developed a mechanically robust Al2O3-PDMS-Cu composite coating with strong adhesive strength and remarkable antifouling performance. This coating, fabricated by infiltrating PDMS into plasma-sprayed micro/nano-scaled porous Al2O3-Cu coating, shows improved surface hydrophobicity and outstanding mechanical durability.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Review
Chemistry, Physical
Xiaowen Guo, Fen Zhang, Yongcai Zhang, Junhua Hu
Summary: This study reviews the application progress of SnS2 in photocatalysis, introduces the properties of SnS2 materials in various photocatalytic applications and related mechanisms. The main activity improvement methods of SnS2 photocatalysts and possible development directions in the future are discussed and researched.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Zhiyuan Fang, Nan Ding, Wen Xu, Tianyuan Wang, Yue Wang, Lu Zi, Junhua Hu, Siyu Lu, Donglei Zhou, Xue Bai, Hongwei Song
Summary: By incorporating lanthanide ions (Ln(3+) = Pr3+, Gd3+, Nd3+, Eu3+, Tm3+, Ho3+, and Yb3+) into all-inorganic CsPbI2Br films, the film quality is significantly improved, leading to enhanced performance of photodetectors (PDs).
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Anqi Liu, Po Lu, Min Lu, Xiaomei Chai, Yu Liu, Gangyun Guan, Yanbo Gao, Zhennan Wu, Xue Bai, Junhua Hu, Dingdi Wang, Yu Zhang
Summary: The performance of quasi-2D perovskite LEDs is significantly improved by introducing the multifunctional additive MTA, which enhances energy transfer and promotes charge transport.
Article
Materials Science, Multidisciplinary
Xiaoyang Liu, Jingbo Zhang, Kangli Liu, Shijie Zhang, Rouhan Hou, Xiaoyi Hu, Peng Zhang, Guosheng Shao
Summary: This paper investigates the influence of pore structure on the polysulfides phase conversions in lithium-sulfur batteries. The results show that large pore structures play a key role in the redox reaction of polysulfides, which can improve the cycling performance and rate capacity of lithium-sulfur batteries.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2024)
Article
Chemistry, Physical
Guangpei Wang, Guodong Hu, Jing Lan, Fujun Miao, Peng Zhang, Guosheng Shao
Summary: The researchers have developed a unique one-dimensional carbon nanofiber structure with a skin-core multilayer design, which enables bicontinuous electron/ion transport and provides a large surface area for ion adsorption. By controlling the number of active layers and regulating the active sites, the capacitive properties can be significantly improved. The skin-core carbon nanofibers exhibit high specific capacitance, favorable rate capability, excellent cycling stability, and high energy/power density in supercapacitor applications.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
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)
