Article
Chemistry, Multidisciplinary
Liang Wang, Luying Li, Shuangfeng Jia, Weiwei Meng, Yongfa Cheng, Zunyu Liu, Li Li, Shuwen Yan, Yihua Gao, Jianbo Wang, Jiang Tang
Summary: In this study, it is found that RP faults are common planar faults in CsPbBr3-based perovskite polycrystal thin films, and their density can be increased by non-stoichiometric composition and reduced dimensionality strategies. Photoluminescence measurement shows increasing peak intensities with higher densities of RP planar faults. Atomic-scale differential phase contrast maps indicate confined charges within the RP planar fault network, explaining the relationship between photoluminescence enhancement and RP planar fault density, and offering a pathway for tailoring the optoelectronic properties of perovskite.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Erin E. Fleck, Matthew R. Barone, Hari P. Nair, Nathaniel J. Schreiber, Natalie M. Dawley, Darrell G. Schlom, Berit H. Goodge, Lena F. Kourkoutis
Summary: This study presents a semi-automated technique based on STEM images to detect and quantify the presence of different n-phases and quantify the local structure. This method is applicable to a wide range of layered materials.
Article
Chemistry, Inorganic & Nuclear
Wang Luo, Na Wang, Hua-Kai Li, Ze-Jiang Xu, Yan Feng, Xiao-bin Fu, Chao Shi, Heng-Yun Ye, Le-Ping Miao
Summary: In this study, a two-dimensional (2D) Ruddlesden-Popper (RP) type hybrid perovskite ferroelastic material (TFCA)(2)CdCl4 is reported, which exhibits a critical temperature of 402 K and a spontaneous strain of 0.071. The rapid rotating motions of polar rotors lead to fast reorientation of dipoles, resulting in a large dielectric response. The study reveals that the 2D RP hybrid perovskite molecular rotor platform provides a new avenue to explore dynamic functional materials.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Materials Science, Ceramics
Songmo Du, Jie Zhang, Fei Li, Zhanglin Chen, Shijia Zhang, Shuo Zhao, Wei Cui, Kexin Chen, Guanghua Liu
Summary: Dual-phase (alpha+beta)-Si3N4 ceramics were prepared by SPS with MgO-RE2O3 and SiO2-RE2O3 as sintering additives. The effect of additives on the phase transition, microstructure evolution, and mechanical properties of Si3N4 ceramics were investigated. The results showed that the type and RE radius of additives have significant influences on the properties of Si3N4.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Applied
Gene Yang, Mohammad El Loubani, David Hill, Jong K. Keum, Dongkyu Lee
Summary: Designing oxide materials with specific crystallographic orientations can significantly enhance the oxygen reduction reaction (ORR) activity. This study demonstrates that the (114)-oriented LSC214 films exhibit much higher ORR activity compared to (001)- and (103)-oriented films, thanks to the exposed oxygen migration channels and increased oxygen vacancies. This research provides a new design strategy to enhance the ORR activity for high-performance energy applications and emphasizes the importance of controlling crystallographic orientation to tune electrocatalytic activity.
Article
Chemistry, Physical
Haiqiang Chen, Yutian Lei, Huanhuan Yao, Zhizai Li, Guoqiang Peng, Xufeng Zhou, Haoxu Wang, Qian Wang, Zhiwen Jin
Summary: This study investigates the influence of a binary mixed solvent on the film quality and photovoltaic properties of (PEA)(2)Cs4Pb5I16 (n = 5). It is found that the crystallization rate and crystal growth can be controlled by adjusting the amount of dimethyl sulfoxide (DMSO), leading to improved device performance.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jingxian Zhong, Yan Sun, Bowen Liu, Chao Zhu, Yang Cao, Encheng Sun, Kaiyue He, Wei Zhang, Kan Liao, Xiaoyong Wang, Zheng Liu, Lin Wang
Summary: Ruddlesden-Popper perovskites exhibit a rich variety of phases due to their mixed organic cations and variable layer numbers. Utilizing a one-pot CVD synthesis method, different layer distributions of Ruddlesden-Popper phases can be achieved within a single perovskite nanosheet, with the optical properties being highly dependent on the nanosheet thickness.
Article
Chemistry, Multidisciplinary
Xinwei Zhao, Ting Zheng, Weiwei Zhao, Yuanfang Yu, Wenhui Wang, Zhenhua Ni
Summary: By varying the composition ratio of organic bulky spacer cations 1-naphthylmethylamine (NMA) and phenylethyl-ammonium (PEA), the phase distribution of Ruddlesden-Popper Perovskite (RPP) is regulated, resulting in improved photoluminescence (PL) emission and expanded application in optical devices.
Article
Chemistry, Physical
Esteban Rojas-Gatjens, Hao Li, Alejandro Vega-Flick, Daniele Cortecchia, Annamaria Petrozza, Eric R. Bittner, Ajay Ram Srimath Kandada, Carlos Silva-Acuna
Summary: We conducted a study on the many-body exciton interactions in a Ruddlesden-Popper tin halide using coherent two-dimensional electronic spectroscopy. The results show differences in exciton quantum dynamics between tin- and lead-based materials, which can be attributed to the strength of exciton-exciton interaction and the static disorder aspect of the crystalline structure.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Junsang Cho, Preethi S. Mathew, Jeffrey T. DuBose, Prashant Kamat
Summary: 2D lead halide perovskites with tunable bandgap and enhanced chemical stability are useful for designing optoelectronic devices. Reducing dimensionality can increase resistance to light-induced ion migration, but also decreases the efficiency of halide ion segregation and segregation rate constant, leading to a decrease in charge-carrier lifetime.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Chris R. Roy, Yadong Zhou, Daniel D. Kohler, Zihua Zhu, John C. Wright, Song Jin
Summary: The study reveals the presence of heterogeneity in mixed-halide phases even in solution-grown microplates without photoinduced phase separation. X-ray diffraction and secondary ion mass spectrometry imaging confirm the halide immiscibility, while photoluminescence imaging alone can lead to false conclusions about homogeneous alloy formation. Spectral imaging is demonstrated as an alternative high-throughput tool for accurate characterization of halide phases in mixed-halide RPPs.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Federico Locardi, Margarita Samoli, Alberto Martinelli, Onur Erdem, Debora Vale Magalhaes, Sara Bals, Zeger Hens
Summary: Metal halide perovskites, particularly the CsPbX3 structure, are extensively studied in optoelectronics, with efforts to substitute lead with other metals while maintaining the material properties. The synthesis of Cs2CdCl4:Sb3+ colloidal nanoplatelets with strict control of synthesis parameters resulted in uniform particles with intense cyan emission attributed to Sb3+ doping.
Article
Physics, Applied
Lei Zhang, Shaofeng Shao
Summary: This article systematically investigates the interactions between atmospheric gas molecules and two-dimensional halide perovskites using first-principles calculations. The study reveals that gas molecules can influence the electronic and optical properties of the perovskite systems, and the interfacial structures are stabilized through the formation of hydrogen bonds. A small amount of electron transfer from the gas molecule to the perovskite substrate helps stabilize the overall structures. The introduction of SO2 can lead to deep defects in the perovskite material, damaging its electronic properties. Light excitation causes different interfacial charge transfer directions depending on the gas molecule, with SO2 and CO causing charge transfer from the perovskite to the molecule, and NH3, H2S, and H2O causing charge transfer in the reverse direction.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Liangliang Min, Wei Tian, Fengren Cao, Jun Guo, Liang Li
Summary: This research successfully controlled the phase distribution of 2D perovskites using a solvent additive method and hot-casting process, which improved photoresponse of devices. The optimized device showed high performance, stability, and fast response speed in optical-electronic conversion.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Ya Liu, Shuangpeng Yan, Tianchi Wang, Qingshan He, Xiaodie Zhu, Chao Wang, Daiyuan Liu, Ting Wang, Xuhui Xu, Xue Yu
Summary: In this study, the long persistent luminescence of 2D all-inorganic perovskites with a self-assembled 2D interlayer galleries structure is investigated. It is found that by replacing Cd2+ with appropriate Mn2+ ions in 2D Cs2CdCl4 Ruddlesden-Popper phase perovskites, the decay time of long persistent luminescence increases from 450 s to 600 s, the luminescence color changes from cyan to orange, and the thermal stability of photoluminescence enhances significantly. Furthermore, diversified anti-counterfeiting modes are fabricated to demonstrate the promising applications of Cs2CdCl4 perovskite systems with tunable persistent luminescence in advanced anti-counterfeiting.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Multidisciplinary
Guoxing Chen, Armin Feldhoff, Anke Weidenkaff, Claudia Li, Shaomin Liu, Xuefeng Zhu, Jaka Sunarso, Kevin Huang, Xiao-Yu Wu, Ahmed F. Ghoniem, Weishen Yang, Jian Xue, Haihui Wang, Zongping Shao, Jack H. Duffy, Kyle S. Brinkman, Xiaoyao Tan, Yan Zhang, Heqing Jiang, Remi Costa, Kaspar Andreas Friedrich, Ralf Kriegel
Summary: MIEC membranes have gained interest for various environmental and energy applications, presenting challenges and opportunities for future research. Understanding the underlying physical and chemical processes is crucial for career advancement of researchers in this interdisciplinary field.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Engineering, Chemical
Mario Wolf, Lena Rehder, Frank Steinbach, Marvin Abt, Richard Hinterding, Ludger Overmeyer, Armin Feldhoff
Summary: This study found that the combination of laser sintering and subsequent thermal sintering is promising for the preparation of thermoelectric films, with great potential to improve the processing of thermoelectric materials.
CHEMIE INGENIEUR TECHNIK
(2022)
Article
Engineering, Electrical & Electronic
Richard Hinterding, Desiree Rieks, Patrick A. Kissling, Lukas Steinbach, Nadja C. Bigall, Armin Feldhoff
Summary: In this study, ceramic composites composed of oxide materials were synthesized by reaction sintering of BiCuSeO nanosheets with Ca3Co4O9. The research focused on understanding phase transformations, thermal stability, microstructure, and composition of the composites. Different mixtures resulted in varied phases and compositions, influencing the thermoelectric properties significantly. The power factor of the composites reached 5.4 μW cm(-1) K-2, more than double that of pristine Ca3Co4O9.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Review
Physics, Multidisciplinary
Armin Feldhoff
Summary: The term thermal capacity refers to the storable thermal quantity, while entropy capacity is a well-defined physical coefficient that relates the response of a system to a stimulus. Entropy capacity plays a key role in understanding the thermal behavior of solids and estimating their entropy.
Article
Engineering, Chemical
Zhijun Zhao, Li Ding, Richard Hinterding, Alexander Mundstock, Christopher Belke, Rolf J. Haug, Haihui Wang, Armin Feldhoff
Summary: Well-intergrown ZIF-67 membranes were prepared with the assistance of laminarly stacked MXene films, exhibiting excellent gas separation performance and long-term stability against CO2 and H2O.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Pharmacology & Pharmacy
Abdalrahim Alahmad, Wael A. Al-Zereini, Tahani J. Hijazin, Osama Y. Al-Madanat, Ibrahim Alghoraibi, Omar Al-Qaralleh, Samer Al-Qaraleh, Armin Feldhoff, Johanna-Gabriela Walter, Thomas Scheper
Summary: Silver nanoparticles prepared with silver nitrate and hot St. John's wort extract showed antibacterial activity against both Gram-positive and Gram-negative bacterial strains, highlighting their potential applications in pharmaceutical and food industries.
Article
Chemistry, Physical
Stefan Schwarzmueller, Daniel Souchay, Gerald Wagner, Paul Kemmesies, Daniel Guenther, Michael Bittner, Guanhua Zhang, Zefeng Ren, Armin Feldhoff, G. Jeffrey Snyder, Oliver Oeckler
Summary: In this study, it was demonstrated that a new composite material can be formed by adding copper and doping material to a specific composition of copper germanium antimony tellurides. The composite material exhibits superior thermoelectric properties suitable for temperature-dependent applications. Furthermore, strategies such as optimizing grain boundaries and temperature-induced microstructure reset were proposed to overcome material degradation during electrical current application.
CHEMISTRY OF MATERIALS
(2022)
Editorial Material
Materials Science, Ceramics
Kyle Brinkman, Armin Feldhoff, Eva Hemmer, Krista Carlson
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Katharina Kruppa, Itzhak I. Maor, Frank Steinbach, Vadim Beilin, Meirav Mann-Lahav, Mario Wolf, Gideon S. Grader, Armin Feldhoff
Summary: Oxide-based ceramics offer promising thermoelectric materials for recycling high-temperature waste heat. In this study, electrospun nanofibers of calcium cobaltite were compacted to improve the functional performance of the material and achieve thermal stability.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Crystallography
Giamper Escobar Cano, Yannick Brinkmann, Zhijun Zhao, Patrick A. Kissling, Armin Feldhoff
Summary: In this study, La2NiO4+delta particles with a plate-like morphology were prepared using molten-flux synthesis, and the influence of NaOH on the formation process was investigated. Various techniques including thermogravimetric analysis, powder X-ray diffraction, and electron microscopy were employed to study the structure, morphology, and composition distribution of the reaction product.
Article
Materials Science, Multidisciplinary
Volodymyr Vasylkovskyi, Iryna Bespalova, Oleksandr Gryshkov, Mykola Slipchenko, Serhii Tkachenko, Pavlo Arhipov, Iaroslav Gerasymov, Yuriy Zholudov, Zhijun Zhao, Armin Feldhoff, Aleksander Sorokin, Olena Slipchenko, Borys Grynyov, Boris Chichkov
Summary: CeAlO3 nanocrystals with perovskite structure were synthesized for the first time using pulsed laser ablation technique. The morphological and optical properties of the nanocrystals were investigated. This work opens up new possibilities for the generation of perovskite nanocrystals and the development of novel nanocomposite structures using laser ablation methods, which can have applications in perovskite solar cells, scintillation detectors, catalysts, etc.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Melanie Johanning, Marc Widenmeyer, Giamper Escobar Cano, Vanessa Zeller, Sebastian Klemenz, Guoxing Chen, Armin Feldhoff, Anke Weidenkaff
Summary: The development of a circular economy based on sustainable technologies requires the integration of materials recycling and a minimal environmental impact. This study demonstrates the integration of life cycle assessment (LCA) into the development of a chemical (recycling) process, showing that recycling reduces the environmental impact. These results encourage the integration of LCA as a standard method in the development of sustainable chemical processes.
Article
Chemistry, Multidisciplinary
Zhijun Zhao, Guoxing Chen, Giamper Escobar Cano, Patrick A. Kissling, Oliver Stoelting, Bernd Breidenstein, Sebastian Polarz, Nadja C. Bigall, Anke Weidenkaff, Armin Feldhoff
Summary: Nd2NiO4+delta, a Ruddlesden-Popper oxide, shows improved oxygen permeation membrane performance by adjusting grain orientation, making it a promising candidate for industrial applications in air separation, syngas production, and CO2 capture.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Biochemistry & Molecular Biology
Aasir Rashid, Hyunjung Lim, Daniel Plaz, Giamper Escobar Cano, Marc Bresser, Katharina-Sophia Wiegers, Giorgia Confalonieri, Sungho Baek, Guoxing Chen, Armin Feldhoff, Andreas Schulz, Anke Weidenkaff, Marc Widenmeyer
Summary: This study investigates the compatibility of La0.6Ca0.4Co1-xFexO3-d membranes with hydrogen and explores the possibility of incorporating green hydrogen into the CO2 conversion process. The research finds that the La0.6Ca0.4Co0.2Fe0.8O3-d membrane shows tolerance towards reducing conditions of hydrogen.
Article
Computer Science, Interdisciplinary Applications
Marvin Abt, Katharina Kruppa, Mario Wolf, Armin Feldhoff, Ludger Overmeyer
Summary: This research demonstrates a proof-of-concept for the fabrication of modular, customizable, and temperature-stable TEGs using an alternative laser process. By using low temperature cofired ceramics substrates, the TEGs were structured and cut without masks using a laser and then sintered to form a solid structure. The experiments showed that the TEGs achieved high power and voltage output.
ENGINEERING REPORTS
(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)
