Article
Materials Science, Ceramics
Arkadiusz Dawczak, Wojciech Skubida, Aleksandra Mielewczyk-Gryn, Maria Gazda
Summary: The structural, thermal, and electrical properties of (La0.2Nd0.2Sm0.2Gd0.2Eu0.2)1-xCaxNbO4-δ (x = 0-0.05) series were studied. X-ray powder diffraction and thermogravimetry were used to determine the structural and thermal characteristics, while electrochemical impedance spectroscopy was employed to measure the electrical properties. The results showed that the materials had stable crystal structures and the addition of calcium dopant significantly enhanced the conductivity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Thermodynamics
L. P. Putilov, V. Tsidilkovski
Summary: This study elucidates the implications of the interaction between protons and oxygen vacancies with acceptor impurities in oxide membranes for the performance of protonic ceramic electrochemical cells (PCECs). The results show that the interaction between ionic defects and impurities can substantially affect the characteristics of proton-conducting membranes. By tuning the acceptor impurities in oxide membranes, the power density and faradaic efficiency of PCECs can be adjusted.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Materials Science, Ceramics
Xiangyang Liu, Peng Zhang, Yi Han, Wei Pan, Chunlei Wan
Summary: In this paper, a series of high-entropy rare earth niobates were prepared via solid state reaction and their thermal and mechanical properties were studied. It was found that high-entropy rare earth niobates exhibit excellent phase stability, high fracture toughness and hardness. The composite material showed the best mechanical properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Engineering, Chemical
Na Rae Kang, Thanh Huong Pham, Hannes Nederstedt, Patric Jannasch
Summary: Phosphonated aromatic polymers functionalized with highly acidic perfluorophenylphosphonic acid show high conductivity, efficient ionic clustering, excellent proton conductivity, and outstanding thermal stability, making them attractive for applications in catalyst layers and proton exchange membranes.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Inorganic & Nuclear
Pia L. Lange, Thomas Schleid
Summary: The new Li3La[PS4](2) structure features [PS4](3-) anions and a unique La3+ cation position, surrounded by sulfur atoms constructing a trigonal dodecahedron. Layers of [LaS8](13-) polyhedra connected by [PS4](3-) tetrahedra have Li+ cations in between with different sulfur coordination numbers. Energy-dispersive X-ray spectroscopy confirmed the absence of chlorine in the crystals, while calculations of Effective Coordination Numbers and Madelung Parts of the Lattice Energies highlighted the relationship with other ternary compounds.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Materials Science, Ceramics
Jiatong Zhu, Xuanyu Meng, Jie Xu, Ping Zhang, Zhihao Lou, Michael J. Reece, Feng Gao
Summary: A novel high-entropy rare earth niobates material has been prepared, showing superior mechanical properties, high thermal expansion coefficient, and ultra-low thermal conductivity, making it a potential alternative for traditional yttria-stabilized zirconia as a new type of thermal barrier coating.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Long Q. Le, Charlie Meisel, Carolina H. Hernandez, Jake Huang, Youdong Kim, Ryan O'Hayre, Neal P. Sullivan
Summary: Proton-conducting ceramics play an important role in electrochemical electricity generation, energy storage, and fuels synthesis. The study finds that the durability of protonic-ceramic electrolyzers is superior to fuel cells. The introduction of an interlayer greatly reduces the degradation rate in both fuel cells and electrolyzers.
JOURNAL OF POWER SOURCES
(2022)
Review
Biochemistry & Molecular Biology
Galina F. Prozorova, Alexander S. Pozdnyakov
Summary: In this article, a comparative analysis was conducted on the physicochemical, dielectric, and proton-conducting properties of composite polymer materials based on 1H-1,2,4-triazole. The results showed that 1H-1,2,4-triazole and its homopolymers and copolymers have promising potential for the development of proton-conducting fuel cell membranes. These materials improve the characteristics of electrolyte membranes, enhance their film-forming ability, increase thermal and electrochemical stability, and provide high ionic conductivity under anhydrous conditions at high temperatures.
Article
Biochemistry & Molecular Biology
Alyona Lesnichyova, Semyon Belyakov, Anna Stroeva, Sofia Petrova, Vasiliy Kaichev, Anton Kuzmin
Summary: The dense ceramic production of perovskite La1-xBaxScO3-δ faces challenges due to impaired sintering and decreased material conductivity. High-temperature processing and the introduction of Co3O4 sintering additive are effective methods, but can negatively affect material stoichiometry and proton stability.
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
Materials Science, Ceramics
Qiqiang Zhang, Bo Wen, Jia Luo, Yanchun Zhou, Xingyuan San, Yiwang Bao, Qingguo Feng, Salvatore Grasso, Chunfeng Hu
Summary: In this paper, a new ternary layered MAX phase Sc2PbC was predicted by combining rare earth element Sc and lead-containing MAX. Sc2PbC with a purity of 87.40 wt% was successfully synthesized and its crystal structure and atomic positions were obtained through X-ray diffraction. The Rietveld refinement results confirmed the typical MAX phase P63/mmc (No.194) space group of Sc2PbC with specific lattice parameters and atomic positions. Scanning electron microscope analysis revealed the typical MAX phase layered microstructure in Sc2PbC bulk. Energy dispersive spectroscopy measurements confirmed the composition of Sc2PbC within the allowable error range, validating it as a new MAX phase compound.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Inna A. Zvonareva, Anna V. Kasyanova, Artem P. Tarutin, Gennady K. Vdovin, Julia G. Lyagaeva, Dmitry A. Medvedev
Summary: Systematic studies on BaZr0.8-xSnxSc0.2O3-delta revealed that the composition with x = 0.1 exhibits the highest values in terms of ionic and grain conductivities. Low-level substitution of Zr4+ with Sn4+ ions shows promise in designing new proton-conducting electrolytes for high-temperature applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Energy & Fuels
K. Karuppasamy, Dhanasekaran Vikraman, Kyu-Won Jang, Seenu Ravi, Waqas Hassan Tanveer, Ranjith Bose, Maiyalagan Thandavarayan, Hyun-Seok Kim
Summary: This study demonstrates the synthesis of carbohydrate polymer phytagel based composite proton exchange membranes for proton exchange membrane fuel cells. By loading different amounts of sulfamic acid, the proton conductivity of the membranes can be substantially improved without affecting other properties. The highest proton conductivity was achieved with 7 wt% sulfamic acid, showing excellent performance in single cell tests compared to other membranes at elevated temperature and high humidity conditions.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Review
Chemistry, Multidisciplinary
Guowei Weng, Kun Ouyang, Xuanhe Lin, Jian Xue, Haihui Wang
Summary: This review comprehensively introduces promising technologies for hydrogen and ammonia production based on dense proton conducting membrane reactors, and summarizes the relative developments and challenges for each application, including membrane materials, operating temperatures, and hydrogen sources. Future research goals to overcome relative challenges and prospective developments to meet industrial requirements are discussed.
REACTION CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Guowei Weng, Kun Ouyang, Xuanhe Lin, Sisi Wen, Yisa Zhou, Song Lei, Jian Xue, Haihui Wang
Summary: In this research, an efficient in-situ exsolution strategy was proposed to enhance the H-2 permeability and CO2 stability of lanthanum tungstate-type membranes. By in-situ generating catalytic Pd nanoparticles, the H-2 permeation flux was increased by 3.5 times and the membrane showed outstanding long-term chemical stability in a CO2-containing atmosphere.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Mostafa El Laithy, Ling Wang, Terry J. Harvey, Alexander Schwedt, Bernd Vierneusel, Joachim Mayer
Summary: Dark etching region (DER) formation is the initial stage of subsurface microstructural changes in bearing steels due to cyclic stresses, which is followed by the development of low angle bands (LAB) and high angle bands (HAB). This study analyzes the development of DER in two different steels, 100Cr6 and 50CrMo4, at different stages of bearing lifetime using SEM, EBSD, and nanoindentation. The findings show that early stages of DER are characterized by multiple dark etching bands oriented relative to the rolling direction. These bands contribute to the refinement of the parent microstructure and act as stress points that initiate LAB formation through recrystallization. This study establishes a connection between DER and LAB/HAB development in rolling bearings.
Article
Chemistry, Physical
Youbing Li, Shuairu Zhu, Erxiao Wu, Haoming Ding, Jun Lu, Xulin Mu, Lu Chen, Yiming Zhang, Justinas Palisaitis, Ke Chen, Mian Li, Pengfei Yan, Per O. a. Persson, Lars Hultman, Per Eklund, Shiyu Du, Yongbo Kuang, Zhifang Chai, Qing Huang
Summary: Researchers have designed a new Ta2CoC@Ta(2)CTx core-shell structure that exhibits excellent catalytic performance in alkaline electrolyte environments, making it suitable for electrocatalytic hydrogen and oxygen production. This study provides a new strategy for designing multifunctional electrocatalysts and paves the way for the development of MAX phase-based materials in clean energy applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Lukas Voelkel, Dennis Braun, Melkamu Belete, Satender Kataria, Thorsten Wahlbrink, Ke Ran, Kevin Kistermann, Joachim Mayer, Stephan Menzel, Alwin Daus, Max C. Lemme
Summary: The switching mechanism of multilayer hexagonal boron nitride (h-BN) threshold memristors with nickel (Ni) electrodes is investigated through temperature-dependent current-voltage measurements. The formation and retraction of nickel filaments along boron defects in the h-BN film are proposed as the resistive switching mechanism. The electrical data are corroborated with TEM analyses, confirming the viability of using temperature-dependent current-voltage measurements as a valuable tool for analyzing resistive switching phenomena in memristors made of 2D materials. The memristors exhibit wide current operation range, low standby currents, low cycle-to-cycle variability, and a large On/Off ratio.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Yubing Li, Lei Zeng, Ge Pang, Xueer Wei, Mengheng Wang, Kang Cheng, Jincan Kang, Jose M. Serra, Qinghong Zhang, Ye Wang
Summary: The direct hydrogenation of CO2 to gasoline and olefins using bifunctional iron-zeolite tandem catalysts operated at high temperatures (>300 degrees C) can efficiently utilize CO2 from industrial combustion and green H2 produced by solid oxide electrolytic cells (SOEC). The optimized FeMnK+H-ZSM-5 catalyst achieves a selectivity of 70% for C5-C11 range hydrocarbons and 17% for C2-C4 lower olefins at 320 degrees C. The conversion levels of CO2 and the aromatics contents are significantly enhanced at higher temperatures.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Joachim Pasel, Johannes Haeusler, Dirk Schmitt, Helen Valencia, Joachim Mayer, Ralf Peters
Summary: The catalytic upgrading of CO2-based ethanol into valuable products, such as higher alcohols, is an increasingly popular research topic. Among these products, carbon-neutral n-butanol has the potential to replace a significant portion of conventional gasoline in the transportation sector. The Guerbet reaction, particularly the homo aldol condensation of acetaldehyde, has been studied as a promising synthesis route for n-butanol. In this study, the Temporal Analysis of Products methodology was used to investigate the reaction, with lanthanide oxides supported on activated carbon as catalysts. The research revealed the formation of butanol through the aldol condensation of acetaldehyde, as well as its decomposition into CO, CH4, and H2. Carbonaceous deposits were formed when acetaldehyde was pulsed onto the catalyst surface, but catalyst regeneration was successfully achieved through O2 pulsing. Other reaction routes leading to acidic acid, ethyl acetate, or diethyl ether were excluded through experimental tests.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Environmental Sciences
Aida M. Diez, Marta Pazos, M. Angeles Sanroman, Helen Valencia Naranjo, Joachim Mayer, Yury Kolen'ko
Summary: This study successfully synthesized and characterized fluoride-doped-TiO2 and demonstrated its applicability in solid-phase photodegradation of polyethylene films for the first time. After three weeks of UV A radiation using a low consumption LED lamp, the polyethylene films containing only 2% of the photocatalyst experienced nearly 50% weight loss, surpassing previously reported data. The results suggest the potential for future production of self-photodegradable plastics for environmental and wastewater treatment applications.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Chemical
Marwan Laqdiem, Julio Garcia-Fayos, Laura Almar, Maria Balaguer, Jose M. Serra
Summary: Oxygen transport membranes (OTMs) are attractive for decarbonization of the industry, but the oxygen permeation remains a limitation. Dual-phase composite materials have potential as membrane candidates due to their stability under CO2 atmospheres. The phase ratio in the catalytic layers affects the surface-exchange reactions and plays a crucial role in improving the oxygen flux.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Samira Dorri, Jens Birch, Fredrik Eriksson, Justinas Palisaitis, Per O. A. Persson, Babak Bakhit, Lars Hultman, Naureen Ghafoor
Summary: In this study, CrBx/TiBy (0001) diboride superlattices were grown epitaxially on Al2O3 substrates using direct-current magnetron sputter epitaxy. The effects of period and B/TM ratio on the structural quality were investigated. It was found that increasing the relative thickness of TiBy improved the superlattice quality but excessive TiBy led to structural distortion. On the other hand, increasing the relative thickness of CrBx enhanced the superlattice quality and hindered the formation of B-rich boundaries. The hardness values of the superlattices ranged from 29-34 GPa.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Michael Frentzen, Michail Michailow, Ke Ran, Noel Wilck, Joachim Mayer, Sean C. Smith, Dirk Koenig, Joachim Knoch
Summary: Recently, the nanoscale electronic structure shift induced by anions at surfaces (NESSIAS) has been described, based on density functional theory calculations and experimental data. This model explains the structure shift of low-doped single-crystalline Si nanowells (Si-NWs) with thicknesses <= 3 nm embedded in SiO2 (Si3N4) towards n-type (p-type) behavior. The influence of anions allows for very steep p-n junctions without the drawbacks of impurity doping. The process to fabricate crystalline silicon (c-Si) NWs embedded in SiO2 and Si3N4 is described and evaluated in terms of reproducibility and surface roughness.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Multidisciplinary Sciences
Haoming Ding, Youbing Li, Mian Li, Ke Chen, Kun Liang, Guoxin Chen, Jun Lu, Justinas Palisaitis, Per O. A. Persson, Per Eklund, Lars Hultman, Shiyu Du, Zhifang Chai, Yury Gogotsi, Qing Huang
Summary: Intercalated layered materials provide distinctive properties and serve as precursors for important 2D materials. This study presents a structural editing protocol for layered carbides (MAX phases) and their 2D derivatives (MXenes). Gap-opening and species-intercalating stages were mediated by chemical scissors and intercalants, resulting in a large family of MAX phases with unconventional elements and structures, as well as MXenes with versatile terminals. The reconstruction of MAX phases and a family of metal-intercalated 2D carbides may drive advances in fields ranging from energy to printed electronics.
Article
Chemistry, Physical
Marwan Laqdiem, Alfonso J. Carrillo, Georgios Dimitrakopoulos, Maria Balaguer, Julio Garcia-Fayos, Ahmed F. Ghoniem, Jose M. Serra
Summary: This study investigates the application of cerium oxide (CeO2) particles in solar-driven thermochemical cycles and explores the effect of doping with other cations on oxygen-vacancy concentration and crystal lattice. The results show that doping can enhance fuel yield and redox oxygen-exchange kinetics.
SOLID STATE IONICS
(2023)
Article
Materials Science, Multidisciplinary
Naureen Ghafoor, Samira Dorri, Justinas Palisaitis, Lina Rogstrom, Babak Bakhit, Grzegorz Greczynski, Lars Hultman, Jens Birch
Summary: Metastable super-saturated Zr1_xAlxN alloys tend to phase separate into the equilibrium cubic (c) ZrN and wurtzite (w) AlN. Different transformation paths were observed depending on the deposition method and post-deposition annealing. The surface segregation effects and secondary phase transformations were studied using in situ high-energy synchrotron wide-angle X-ray scattering and analytical transmission electron microscopy. The results showed the formation of AlN-ZrN labyrinthine structure and the inhibition of c-AlN formation during transformation.
Article
Materials Science, Coatings & Films
Hairui Ma, Qiang Miao, Wenping Liang, Per O. A. Persson, Justinas Palisaitis, Xiguang Gao, Yindong Song, Per Eklund, Arnaud le Febvrier
Summary: This study investigated the structure and mechanical properties of c-TiAlN/h-Cr2N multilayer thin films. The results showed that regardless of the modulation period and thickness ratios, the multilayer films exhibited preferred orientation and well-defined grain boundaries. In terms of mechanical properties, the film with a 20 nm period and 75% Cr2N thickness ratio demonstrated the highest hardness and reduced elastic modulus.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Andres Lopez-Garcia, Aitor Dominguez-Saldana, Alfonso J. Carrillo, Laura Navarrete, Maria I. Valls, Beatriz Garcia-Banos, Pedro J. Plaza-Gonzalez, Jose Manuel Catala-Civera, Jose Manuel Serra
Summary: Exsolution has become a promising method for generating metallic nanoparticles, offering better stability and robustness compared to conventional deposition methods. Alternative exsolution methods that do not rely on high-temperature reduction are being explored, such as utilizing electrochemical potentials or plasma technologies. In this study, a method based on pulsed microwave radiation is proposed for driving the exsolution of metallic nanoparticles, enabling high scalability with short exposure times and low temperatures.
Article
Chemistry, Multidisciplinary
J. M. Serra, M. Balaguer, J. Santos-Blasco, J. F. Borras-Morell, B. Garcia-Banos, P. Plaza-Gonzalez, D. Catalan-Martinez, F. Penaranda-Foix, A. Dominguez, L. Navarrete, J. M. Catala-Civera
Summary: This study investigates microwave-induced redox transformations on solid-state ion-conducting materials, and finds that reduction is triggered at a specific temperature leading to a significant increase in electric conductivity. The effectiveness of the redox process is influenced by material composition, gas environment, and microwave power intensity, with fine-grained materials showing amplified effects.
MATERIALS HORIZONS
(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)
