Article
Chemistry, Inorganic & Nuclear
Jhonatan R. Guarin, Carlos Frontera, Judith Oro-Sole, Jaume Gazquez, Clemens Ritter, Josep Fontcuberta, Amparo Fuertes
Summary: Europium tantalum perovskite oxynitrides were successfully prepared by a new high-temperature solid-state synthesis method. The crystal structure and magnetic properties of the materials can be tuned by different reactant mixtures and gas atmospheres. Among them, Eu3Ta3O3.66N5.34 is the first example of a triple perovskite oxynitride.
INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Karen N. Heinselman, Lacey S. Roberts, James L. Young, Andriy Zakutayev
Summary: This study reports reduced synthesis temperatures for SrNbO2N perovskite thin films on Si substrates, and investigates the impact of different chemical compositions on their photocurrent density.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Yunfeng Bao, Shiwen Du, Yu Qi, Gao Li, Peng Zhang, Guosheng Shao, Fuxiang Zhang
Summary: The study demonstrated the feasibility of synthesizing a novel perovskite SmTiO2N from the layered NaSmTiO4 precursor, showing wide visible-light response, high water reduction and oxidation efficiencies, and accelerated nitrogen-to-oxygen substitution reaction facilitated by ammonia. Experimental results indicate that SmTiO2N exhibits high apparent quantum efficiency in water splitting.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Erhai An, Yingxin Tan, Cunjuan Yu, Ying Zhang, Haihong Liu, Xiong Cao, Peng Deng, Xiaoxia Li
Summary: This paper introduces a new type of solid fuel, nano silicon (Si) powder, and proposes the use of DAP-4 as an oxidant to prepare DAP-4/Si composites. The thermal decomposition and combustion properties of DAP-4/Si composites were studied, and it was found that the combustion properties first increased and then decreased with Si content. The combustion mechanism of DAP-4/Si composites was proposed based on their ignition and combustion characteristics. This work provides a further reference for the application of DAP-4 in solid propellant formulation.
Article
Materials Science, Ceramics
Wenhan Dong, Bi-Xia Wang, Yi Yuan, Hua Wu, Alexei A. Bokov, Zuo-Guang Ye
Summary: In this study, a novel solid solution (1-x)(Pb0.5Sr0.5)(Zr0.5Ti0.5)O-3-xPbTiO(3) was synthesized to explore lead-reduced dielectric materials. The crystal structure and dielectric properties were studied, revealing a structural transformation from a cubic phase to a tetragonal phase. The temperature dependence of dielectric constant exhibits relaxor behavior or a normal ferroelectric phase transition.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Hiroto Takeuchi, Daiki Miyamoto, Yuji Masubuchi, Mikio Higuchi, Kento Ishii, Tetsuo Uchikoshi
Summary: Thick ceramic films with a relative density close to 90% of the ferroelectric perovskite oxynitride, BaTaO2N, were successfully fabricated using electrophoretic deposition and high-temperature sintering. The nitrogen loss was fully recovered during annealing under an NH3 flow, restoring the electrically insulating properties of the ceramic.
CERAMICS INTERNATIONAL
(2023)
Article
Multidisciplinary Sciences
Xiaoming Xu, Wenjing Wang, Yuanming Zhang, Yong Chen, Huiting Huang, Tao Fang, Yang Li, Zhaosheng Li, Zhigang Zou
Summary: This study successfully synthesized high-quality epitaxial perovskite SrTaO2N single crystals on the centimeter scale and demonstrated their excellent performance in photoelectrochemical water oxidation, with low onset potential and high photocurrent filling factor.
Article
Chemistry, Physical
Ghulam Hussain, Shanta Batool, Yuruo Zheng, Shuyi Li, Xiawa Wang
Summary: A series of double-perovskite La2Co1-zFezMnO6 (z = 0, 0.2-1.0) ceramics were synthesized using a sol-gel method. The samples exhibited a monoclinic phase and symmetrical properties, and showed semiconducting behavior. The dielectric properties were enhanced with increasing iron concentrations.
Article
Chemistry, Physical
O. Polat, M. Coskun, P. Roupcova, D. Sobola, Z. Durmus, M. Caglar, T. Sikola, A. Turut
Summary: Rare-earth ferrites, particularly LuFeO3 and LuFe1-xIrxO3 ceramics with different mol%, were studied for their electrical properties. Various techniques, including XRD, SEM, and XPS, were utilized to investigate the crystal nature, surface topography, and valence states of the materials. The study revealed that undoped LFO exhibited higher dielectric constant and conductivity compared to the Ir doped samples, which was attributed to the reduction in Fe2+ ions ratio and defects/distortions in the LFO structure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Li Yang, Xiaoyan Yang, Weishuang Fang, Sihao Deng, Lunhua He, Laijun Liu, Alberto J. Fernandez-Carrion, Xiaojun Kuang
Summary: In this study, the novel double-perovskite La2Mg(Mg1/3Sb2/3)O6 was successfully synthesized by solid-state reaction method, and its structure was determined for the first time using a combination of X-ray and neutron powder diffraction analysis. The material showed a thermal expansion coefficient of -9.1 ppm/°C and a wide optical band gap of 4.23 eV. It exhibited Debye-like behavior in complex impedance analysis, with a bulk conductivity ranging from 10-7 to 10-4 S·cm-1 in the temperature range of 500-900 °C, and an activation energy of -1.36 eV. Additionally, the sintered La2Mg(Mg1/3Sb2/3)O6 exhibited optimized microwave dielectric properties with a quality factor (Qxf) of -28,700 GHz (f = 9.65 GHz), a dielectric constant (& epsilon;r) of -20.2, and a temperature coefficient of resonant frequency (of) of -89 ppm/°C.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Review
Chemistry, Physical
K. Snini, M. Akyol, M. Ellouze, L. El Mir, F. Ghribi, A. Ekicibil
Summary: The study focuses on preparing Pr0.67Ba0.22Sr0.11Mn0.975Ni0.025O3 compound and analyzing its electrical properties and metal-semiconductor transitions using impedance spectroscopy and conductivity analysis. The material is found to be suitable for high frequency energy storage devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Qingkai Tang, Xinhua Zhu
Summary: The paper investigates the structural, optical, dielectric, and magnetic properties of LFRO powders synthesized under CO reduced atmosphere, revealing their crystalline structure, molar ratios of elements, dielectric relaxation behavior, room temperature ferromagnetism, and optical band gap characteristics. The LFRO powders exhibit column-like morphology, relaxor-like dielectric behavior, room temperature ferromagnetism, and a direct optical band gap of 2.30 eV with a strong peak around 556 nm in their green photoluminescence spectra.
Article
Chemistry, Physical
Naveen Kumar Tailor, Saurabh K. Saini, Pankaj Yadav, Mahesh Kumar, Soumitra Satapathi
Summary: Lead-free Cs2AgBiBr6 double perovskites show potential as an alternative to lead-based halide perovskites for photovoltaic and optoelectronic applications. This study reveals that the formation of small polarons and their localization limit the carrier dynamics in Cs2AgBiBr6 double-perovskite halide materials. The dominant conduction mechanism is found to be single polaron hopping. These findings provide important insights into the intrinsic limitations of Cs2AgBiBr6 perovskites and their applicability to other bismuth-based semiconductors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Jose G. Miranda-Hernandez, Carlos O. Gonzalez-Moran, Hector Herrera-Hernandez, Enrique Hernandez Sanchez, Jose de Jesus A. Flores-Cuautle, Mayahuel Ortega-Aviles
Summary: The study shows that the addition of Cu2O affects the hardness, fracture toughness, capacitance, and dielectric constant of CaO·Al2O3 ceramic materials. These materials have the potential to be used in various fields such as dentistry, antimicrobial materials, and telecommunication due to their electrical properties.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Raktim Datta, Suman Kalyan Pradhan, Souvik Chatterjee, Subham Majumdar, Subodh Kumar De
Summary: Polycrystalline double perovskite Sm2CoIrO6 ceramics were prepared and studied for their dielectric properties, showing a monoclinic crystal structure with an average grain size of 543 nm. The temperature-dependent dielectric constant exhibited a giant step and saturation at high temperature. The distribution of grain size led to a distribution of dielectric relaxation time.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Yuan-Bin Chen, Wei-Chao Bao, Shi-Kuan Sun, Lewis R. Blackburn, Zi-Jun Wei, Wei-Ming Guo, Hua-Tay Lin
Summary: The evolution of phase assemblage and microstructure of stoichiometric zirconolite (CaZrTi2O7) ceramics prepared by solid-state reaction sintering route was systematically studied with respect to sintering temperature. It was found that the formation of zirconolite was a one-step reaction without intermediate phase formation, confirmed by powder XRD and quantitative phase analysis data. After sintering at 1200 degrees C, the secondary phases of CaTiO3 and ZrO2 were reduced to approximately 2 wt% each, while zirconolite became the major phase (>99 wt%) after reaction at 1300 degrees C. Significant product densification only occurred at T >= 1400 degrees C, achieving a highly desirable relative density of 96.97% for nuclear wasteform applications. The expected zirconolite-2M polytype structure (space group: C2/c) was confirmed in all products through combined high-resolution TEM-ED analyses.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Chen Yang, Xinhua Chen, Minmin Mao, Xinjiang Luo, Weiqin Sheng, Zhilun Lu, Shikuan Sun, Hong He, Weitao Su, Kaixin Song
Summary: Orange-yellow luminescent Y2-xSr1-yAl4SiO12: xCe3+, yMn2+ (x = 0.04-0.06, y = 0.1-0.6, abbreviated as YSAS: xCe3+, yMn2+) phosphors with garnet structure were prepared by the high temperature solid-phase method. The doping of Ce3+/Mn2+ units can enhance the structural rigidity of the YAG host and promote the red-shift of the emission peak position of Mn2+. The thermal stability test of the phosphor showed that the luminous intensity at 473 K still maintained 86% of the room temperature.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Yu-Zhang Zhou, Qi-Qi Zhu, Liang Xu, Wei-Ming Guo, Shi-Kuan Sun, Yang You, Hua-Tay Lin
Summary: This study investigated the effects of VB element (V, Nb and Ta) solid solution on the HfB2 ceramics. The particle size, sinterability, microstructure, and mechanical properties of Nb substituted HfB2-based ceramics were compared with (Hf,V)B2 and (Hf,Ta)B2 ceramics. The results showed that the solid solution of VB transition metal diborides could refine the particle size and improve densification. The addition of SiC did not significantly affect the densification, but V, Nb, and Ta substitution significantly improved hardness while decreasing fracture toughness.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Sheng-Jin He, Ling-Feng Su, Chuang-Tian Zhan, Wei-Ming Guo, Shi-Kuan Sun, Hua-Tay Lin
Summary: By using SiO2-based liquid phase extrusion strategy with Y2O3-Al2O3-SiO2 as the filler, the joining temperature of SiC ceramics was effectively reduced to 1550 degrees Celsius.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Li-Xia Pang, Di Zhou, Xiao-Gang Yao, Hui-Xing Lin, Chen Chen, Zhong-Qi Shi, Fayaz Hussain, Moustafa Adel Darwish, Tao Zhou, Shi-Kuan Sun, Qi-Xin Liang, Ya-Wei Chen
Summary: In this study, (Li0.5Y0.5)MoO4 ceramic with tetragonal scheelite structures was used to enhance the microwave dielectric properties of BiVO4 ceramics. XRD and in situ XRD analysis confirmed the formation of scheelite structured solid-solution ceramics in (Bi1-xLi0.5xY0.5x)(V1-xMox)O-4 system. The (Bi1-xLi0.5xY0.5x)(V1-xMox)O-4 solid-solution ceramics with x value <= 0.1 sintered below 800 degrees C exhibited good microwave dielectric properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Chuang-Tian Zhan, Sheng-Jin He, Wei-Ming Guo, Yuan-Bin Chen, Shi-Kuan Sun, Hua-Tay Lin
Summary: SiC nano-powders with Al2O3-Y2O3- MgO-CaO additive (NITE-SiC) were used as joining materials for low-temperature joining of SiC ceramics, by controlling the thickness of the interlayers (-10 μm and -60 μm). Residual pores were observed in the -60 μm interlayer after joining at 1650 degrees C, with a shear strength of 39.3 +/- 5.5 MPa. Decreasing the interlayer thickness to -10 μm resulted in no cracks or porosity at the interface region, with a shear strength of 69.5 +/- 8.9 MPa and fracture originating from the matrix. The results showed that using NITE-SiC with Al2O3-Y2O3- MgO-CaO additive as the joining layer and reducing the thickness of the interlayer could lower the joining temperature and significantly improve the mechanical strength of joints.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Chao Du, Xiang-Kun Li, Di Zhou, Shao-Fei Wang, Rui-Tao Li, Xiao-Gang Yao, Hui-Xing Lin, Hai-Yi Peng, Tao Zhou, Shi-Kuan Sun, Song Xia, Zhuo Xu
Summary: This paper proposes a high radiation efficiency 4 x 4 cylindrical dielectric resonator antenna (CDRA) array fabricated using the temperature stable 0.8Zn(2)SiO(4)-0.2TiO(2) composite ceramic. The fabricated CDRA array has enhanced measured radiation efficiency, high gain, and is a promising candidate for utilization in Sub-6 GHz 5G Base Station communications systems.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Yan Guo, Di Zhou, Da Li, Weichen Zhao, LiXia Pang, Zhongqi Shi, Wenfeng Liu, Jinzhan Su, Tao Zhou, Shikuan Sun
Summary: In this study, BNT-SST/P(VDF-HFP) nanocomposites were prepared by adding 0.5 (Bi0.5Na0.5)TiO3-0.5(Sr0.85Sm0.1)TiO3 (BNT-SST) nanoparticles to the P(VDF-HFP) polymer matrix. The addition of BNT-SST nanoparticles improved the dielectric characteristics, breakdown strength, insulation, and mechanical properties of the nanocomposites. The energy-storage density and efficiency of the 0.7 vol% BNT-SST/P(VDF-HFP) composites were significantly higher than other polymer matrix composites, suggesting the importance of inorganic nanoparticles in improving the energy-storage performance of polymer-based film capacitors.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Xiao Li, Diming Xu, Di Zhou, Shengzhao Pang, Chao Du, Moustafa Adel Darwish, Tao Zhou, Shi-Kuan Sun
Summary: Due to their high specific surface area and electrical conductivity, 2D materials are widely used for microwave absorption in order to address the issues of electromagnetic wave pollution caused by wearable electronic devices and 5G communication. However, the inadequate dielectric loss capacity poses a major challenge for the application of 2D-based microwave absorbers. To overcome this, researchers developed a vertical heterostructure architecture to synthesize MXene/rGO films with different impedance gradients. The MrG film with 80 wt% rGO content exhibited excellent microwave absorption, with a minimum reflection loss value of -44.3 dB and an effective absorption bandwidth of 4.84 GHz at a thickness of 1.5 mm. This enhanced dielectric loss capacity is attributed to the vertically stacked heterostructures, which provide new electron transport channels along the vertical direction of the films. Visualized power loss density simulations confirmed the synergistic interaction between MXene and rGO, further increasing microwave absorption. This finding offers an alternative approach for the development of efficient, customizable, simple, and low-cost 2D material-based absorbers through the control of vertical heterostructure formation.
Article
Automation & Control Systems
Tao Yang, Shikuan Sun, Guo-Ping Liu
Summary: This article proposes a droop-based distributed discrete-time secondary cooperative control scheme for AC microgrids with communication delays. The scheme aims to compensate for the delays caused by low-bandwidth communication networks and achieve voltage and frequency recovery as well as accurate active power sharing. Each distributed generator only needs to share information with its neighbors, and stability conditions for the closed-loop control systems are derived. The effectiveness of the control strategy is verified through simulations and experiments on the OPAL-RT platform.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Materials Science, Ceramics
Yang Liu, Wei-Ming Guo, Liang Xu, Shi-Kuan Sun, Hua-Tay Lin
Summary: The high sintering temperature can damage the morphology and properties of SiCw in HEC-SiCw composites, which affects the toughening mechanisms. This study aims to maximize the toughening effects of SiCw by preparing (Ti, Zr, Nb, Ta, Mo)C-SiCw composites with cobalt as additives at low temperature (1600 degrees C). Results showed that the fracture toughness of the (Ti, Zr, Nb, Ta, Mo)C bulk reinforced with 20 vol% SiCw and 5 vol% Co was 7.2 MPa·m1/2, higher than that of (Ti, Zr, Nb, Ta, Mo)C bulk sintered with only 5 vol% Co (3.4 MPa·m1/2) and HEC-20 vol% SiCw composite sintered at 2000 degrees C (4.3 MPa·m1/2). Introduction of damage-free SiCw significantly increased the fracture toughness of HEC-SiCw composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Jia-Jia Ren, Di Zhou, Wen-Bo Li, Da Li, Yan Guo, Tao Zhou, Shi-Kuan Sun
Summary: Recently, dielectric ceramic materials have been explored to enhance the energy density and efficiency of high-power capacitors. In this study, the (1-x) [0.88BaTiO3-0.12Bi(Li0.5Nb0.5)O3]-x(0.8BaTiO3-0.2SrTiO3) ceramics were designed for improved dielectric temperature stability and breakdown strength. The influence of composition and phase structure on dielectric properties was investigated, and improvements in dielectric properties and energy storage performance were achieved. The 0.95[0.88BaTiO3-0.12Bi(Li0.5Nb0.5)O3]-0.05 (0.8BaTiO3-0.2SrTiO3) ceramic showed the best performance with an energy storage density of 2.88 J/cm3 (efficiency -86.81%) under 320 kV/cm. This work not only provides key materials for the next generation of high-end energy storage capacitors, but also suggests a new route for optimizing the performance of other relaxor ferroelectrics.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Multidisciplinary
Yongshan Tan, Laura J. Gardner, Brant Walkley, Oday H. Hussein, Hao Ding, Shikuan Sun, Hongfa Yu, Neil C. Hyatt
Summary: The effect of ultrafine fly ash (UFA) and fly ash (FA) on the physical properties and micro-structure of magnesium potassium phosphate cement (MKPC) was studied. UFA addition did not affect the hydration peak of MKPC formation but led to increased reaction duration and potential formation of secondary reaction products. The addition of a UFA:FA blend delayed the hydration and setting time of MKPC. MgKPO4 center dot 6H2O was the main crystalline phase observed, but Mg2KH(PO4)2 center dot 15H2O was also observed at low replacement levels in the UFA-only system. UFA and UFA:FA acted as fillers and diluents. The optimized formulation with 40 wt % fly ash (10 wt % UFA and 30 wt % FA) achieved the highest compressive strength and fluidity, producing a dense microstructure.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Shengheng Tan, Jiong Chang, Xiao Liu, Shikuan Sun, Liang Xian, Shengdong Zhang
Summary: This study investigated the influence of radioactive sludge on the structure and properties of waste glasses, aiming to find the optimal ratio of sludges to high-level liquid waste (HLW) during vitrification. The results showed that the sludge content had little effect on the density, molar volume, sulfur retention, and glass transition temperature of the glasses, but significantly affected the viscosity, chemical durability, crystallization features, and leaching rate of certain elements. It is recommended that the sludge content of the whole waste should not exceed 25 wt%.
Article
Materials Science, Multidisciplinary
Yan Guo, Di Zhou, Da Li, Weichen Zhao, Yifei Wang, Lixia Pang, Zhongqi Shi, Tao Zhou, Shikuan Sun, Charanjeet Singh, Sergei Trukhanov, Antonio Sergio Bezerra Sombra, Guohua Chen
Summary: With the rapid development of the electronic and electrical industry, there is a demand for dielectric capacitors with higher energy storage capacity. This study developed sandwich-structured nanocomposites, consisting of KNN-BZT NPs as the interlayer and P(VDF-HFP) as the outer layer, to overcome the contradiction between high breakdown strength and dielectric constant. Experimental results showed that these nanocomposites have significantly improved energy storage performance compared to P(VDF-HFP). The sandwich-structured nanocomposites provide an economical and efficient strategy to enhance the ability of film capacitors to store energy.
JOURNAL OF MATERIALS CHEMISTRY C
(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)
