Article
Physics, Applied
Zhen Zhang, Shengwen Shu, Zhiguo Wang, Zhengqiu Xie, Huizhong Wang, Chunchun Li, Shanming Ke, Longlong Shu
Summary: In this study, the interplay of flexoelectricity and permittivity in CCTO ceramic was systematically studied. An abnormal flexoelectric transition was observed at 95℃. It was found that below this critical temperature, the barrier layer mechanism dominates the flexoelectricity in CCTO ceramic, while above this critical temperature, the flexoelectric response mainly originates from the contributions of semiconducting grains and insulating grain boundaries.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
S. Grace Infantiya, A. Aslinjensipriya, R. Sylvia Reena, K. Joseph Pious, Periyasamy Sivakumar, C. Justin Raj, S. Jerome Das
Summary: In this study, Zn and Mn co-substituted perovskite ceramics were fabricated using the sol-gel technique and their structural, morphological, dielectric, and electrical conductivity properties were examined. The results showed that the incorporation of Zn and Mn ions improved the temperature stability and dielectric properties of the ceramics, which exhibited semiconducting behavior.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Ceramics
Bhoomika Yadav, Kamal K. Kar, Manas K. Ghorai, Devendra Kumar
Summary: AC electrical measurements were conducted on iodine-doped CaCu3Ti4O12-xIx ceramic specimens. The crystalline structure, microstructure, and oxidation state of various ions were analyzed using XRD, SEM, and XPS. Dielectric relaxations in different compositions were investigated and similar charge carriers were found in conduction and relaxation processes. The XPS study revealed a reduction in [ VO center dot center dot ] concentration and an increase in [ V '' M] with increasing iodine concentration. Metal ions were found to segregate at grain boundaries, leading to increased resistivity and minimized dielectric losses. A high concentration of iodine doping promoted the formation of a barrier layer capacitor.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Guangtan Miao, Nan Li, Peng Li, Jigong Hao, Wei Li, Juan Du, Weifang Han, Guorong Li, Chunming Wang, Peng Fu
Summary: YCr0.5Mn0.5O3(YCM)-CaCu3Ti4O12(CCTO) ceramics with pure perovskite structures were prepared using a solid processing method. The resistivity of the ceramics was found to be sensitive to grain size and grain size distribution. Additionally, the ceramics exhibited NTC characteristics.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
Wentao Hao, Bo Yu, Panpan Xu, Li Sun, Ensi Cao, Yongjia Zhang
Summary: By adding IN0.5Nb0.5)(0.05)Ti0.95O2 (INTO) ceramic powder to CCTO ceramic powder, the CCTO/xINTO multiphase ceramics with INTO phase separating CCTO phase was successfully prepared, leading to a significant decrease in low-frequency dielectric loss mainly attributed to the insulating INTO phase. The CCTO/INTO ceramic sintered at 1040 degrees C for 8 hours in atmosphere exhibited good overall dielectric properties with low-frequency dielectric loss less than 0.05 and a dielectric permittivity of 3000 at room temperature.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Shuai Zhao, Li Xiao
Summary: This study reveals the diffusion mechanism of halide anions in all-inorganic perovskites through first-principles calculations, where intercalation provides an additional diffusion channel, facilitating the exploration of their novel optoelectronic applications.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Multidisciplinary Sciences
R. Rabinovitch, Y. Biton, D. Braunstein, I Aviram, R. Thieberger, A. Rabinovitch
Summary: Several papers have discussed the joint question of transport, tortuosity, and percolation in the context of various liquids or electrical currents in different media, but not in relation to the passage of action potential in heart fibrosis (HF). This study addresses the HF problem using a cellular automaton model to analyze percolation and transport in fibrotic heart-like tissue, leading to important outcomes regarding the percolation of heart-like matrices, Gaussian behavior of transport, and critical behavior near the percolation threshold. These results contribute significantly to the general percolation investigation and have implications for cardiological issues such as reentry initiation.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Jhen-Yong Hong, Chen-Feng Hung, Kui-Hon Ou Yang, Kuan-Chia Chiu, Dah-Chin Ling, Wen-Chung Chiang, Minn-Tsong Lin
Summary: The study reports spin-dependent transport properties and I-V hysteresis characteristics in an AlOx-based magnetic tunnel junction. Four distinctive resistive states are observed in a single device, with resistive switching not triggered by metal filaments within the AlOx layer but by the role of oxygen vacancies. The possibility of controlling multiple resistive states in a single AlOx-based MTJ by the interplay of electric and magnetic fields is revealed, providing potential applications for future multi-bit memory devices.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Ryuhei Sato, Kazuto Akagi, Shigeyuki Takagi, Kartik Sau, Kazuaki Kisu, Hao Li, Shin-ichi Orimo
Summary: Topological data analysis based on persistent homology is applied to the molecular dynamics simulation of the AgI a-phase to analyze the ion migration mechanism effectively. The persistence diagrams of a-AgI record the shape and size of the ring structures in the atomic configurations, clearly showing the emergence of four-membered rings formed by two Ag and two I ions at high temperatures, which are common structures during the Ag ion migration. The potential energy change due to the deformation of the four-membered ring agrees well with the activation energy calculated from the conductivity Arrhenius plot, and the concerted motion of two Ag ions via the four-membered ring is successfully extracted from molecular dynamics simulations, providing new insight into the specific mechanism of the concerted motion.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Jinyu Lu, Gang He, Wenhao Wang, Shanshan Jiang, Qiuju Wu, Zebo Fang
Summary: In this study, the effects of ALD-derived Al2O3 passivation layer with different growth cycles on the interfacial chemistry and electrical performance of ErSmO/InP MOS capacitors were investigated. AFM and XPS characterization confirmed that the 20-cycle ALD-driven Al2O3 passivation layer resulted in a flat dielectric layer and effectively prevented the diffusion of In and P elements at the InP interface. The ErSmO/Al2O3/InP gate stack with 20 growth cycles exhibited excellent electrical properties, making it suitable for future high-speed and high-frequency microelectronic devices.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Jinyu Lu, Gang He, Wenhao Wang, Shanshan Jiang, Qiuju Wu, Zebo Fang
Summary: This study comparatively investigates the effects of different growth cycles of atomic-layer deposition (ALD)-derived Al2O3 passivation layer on the interfacial chemistry and electrical performance of sputtering-driven ErSmO/InP metal oxide semiconductor (MOS) capacitors. The results show that ALD-driven Al2O3 passivation layer with 20 growth cycles can form a flat dielectric layer and effectively suppress the diffusion of In and P elements at the InP interface. The ErSmO/ Al2O3/InP gate stack with 20 growth cycles exhibits optimal electrical properties and has potential applications in future microelectronic devices.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Xiaoyi Lei, Xiaoya Zhu, Hao Wang, Yang Dai, Han Zhang, Chunxue Zhai, Shulong Wang, Junfeng Yan, Wu Zhao
Summary: This study investigates the resistive switching characteristics of Cu/MoS2/ITO RRAM and proposes conceptual models to explain the nonvolatile and volatile behaviors observed. The results suggest that the resistive switching is influenced by the formation and breaking of Cu conductive filaments and the trapping and de-trapping of electrons at the ITO/MoS2 interface.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Chemistry, Inorganic & Nuclear
Rui-lan Liu, Dan-Yang Wang, Jin-Rui Shi, Gang Li
Summary: This review discusses the recent advances in proton conductive sulfonate-based MOFs, analyzing the relationship between structures and proton conducting properties. Perspectives on future opportunities and challenges are proposed and highlighted.
COORDINATION CHEMISTRY REVIEWS
(2021)
Article
Multidisciplinary Sciences
Andrey A. Pil'nik, Andrey A. Chernov, Damir R. Islamov
Summary: This study developed a discrete theory for charge transport in thin dielectric films, showing limitations of existing transport equations and proposing a new model applicable in different dimensions. There was good agreement with other theoretical models, and potential applications in computational code optimization and analytical solution findings were demonstrated.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Mohanbabu Bharathi, Babu Balraj, Chandrasekar Sivakumar, Zhiwei Wang, Jianwei Shuai, Mon-Shu Ho, Donghui Guo
Summary: Nanoscale non-volatile memory technology shows promise for in-memory computing and neuromorphic computing, but further understanding of charge transport and resistive switching mechanisms in memristor devices is needed. A study on MoO3 nanorods revealed improved device performance through analysis of resistive switching behavior and conductive mechanisms. Silver doping into the MoO3 structures showed enhanced bipolar resistive switching performance in the devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Chemistry, Physical
Rajesh Kumar, Sumanta Sahoo, Ednan Joanni, Rajesh K. Singh, Wai Kian Tan, Kamal K. Kar, Atsunori Matsuda
Summary: The demand for electromagnetic interference (EMI) shielding has risen significantly due to rapid developments in the electronics industry. New materials like carbon-based nanostructures, polymers, and MXene-based 2D layered materials are being explored as alternatives to conventional metal sheets for EMI shielding, offering advantages such as low weight, cost-effectiveness, and good thermal/electrical properties. Composite materials combining polymers with conducting carbon fillers have potential as EM wave absorbers, while MXene-based materials have garnered attention for their application in EMI shielding.
Review
Materials Science, Multidisciplinary
Rajesh Kumar, Sumanta Sahoo, Ednan Joanni, Rajesh K. Singh, Wai Kian Tan, Stanislav A. Moshkalev, Atsunori Matsuda, Kamal K. Kar
Summary: Heteroatoms-doped graphene has made significant advancements in modern nanoscience and nanotechnology, particularly in electromagnetic shielding applications. The concept of heteroatom-doping in graphene is considered an efficient strategy for developing novel EMI shielding materials.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2022)
Article
Nanoscience & Nanotechnology
Rajesh Kumar, Sumanta Sahoo, Ednan Joanni, Rajesh K. Singh, Kamal K. Kar
Summary: This study mainly discusses the importance of microwave-assisted synthesis of carbon materials in energy storage applications, introducing the advantages of microwave processing and its application and effects in carbon material synthesis.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Review
Thermodynamics
Rajesh Kumar, Angel Perez del Pino, Sumanta Sahoo, Rajesh Kumar Singh, Wai Kian Tan, Kamal K. Kar, Atsunori Matsuda, Ednan Joanni
Summary: This review summarizes recent studies on laser-assisted synthesis and modification of graphene-based materials, as well as their application as electrodes for supercapacitors and batteries. It provides an overview of the physical properties of graphene and different types of laser processing operations, with a detailed discussion on the practical uses of laser techniques for fabricating electrode materials.
PROGRESS IN ENERGY AND COMBUSTION SCIENCE
(2022)
Article
Chemistry, Physical
Rajesh Kumar, Ednan Joanni, Sumanta Sahoo, Jae-Jin Shim, Atsunori Matsuda, Wai Kian Tan, Rajesh K. Singh
Summary: This article provides a comprehensive overview of the fabrication and electrochemical performance of electrode materials for supercapacitors. It focuses on different-sized carbon nanomaterials and emerging fabrication technologies. The drawbacks of each electrode material, current technological challenges, and promising research directions are also discussed.
Article
Engineering, Chemical
F. M. Praxedes, H. Moreno, A. Z. Simoes, V. C. Teixeira, R. S. Nunes, R. A. C. Amoresi, M. A. Ramirez
Summary: This research investigates the enhancement of optical properties of CaCu3Ti4O12 semiconductor oxide through the incorporation of reduced graphene oxide (rGO). The CCTO-rGO composites exhibit broad photoluminescence emission in the visible spectrum and show improved photocatalytic activity under UV light. These findings suggest that CCTO-rGO composites could be a promising choice for UV-visible light-driven photocatalytic devices, offering high adsorption capacity and shorter response time, thus promoting sustainable water purification methods and related applications.
Article
Chemistry, Physical
H. Moreno, M. Damm, S. M. Freitas, M. V. S. Rezende, A. Z. Simoes, G. Biasotto, V. R. Mastelaro, V. C. Teixeira, M. A. Ramirez
Summary: This study investigates the effects of Ce on the (micro)structure and photoluminescence of CaCu3Ti4O12 ceramics. Ce ions are found to be incorporated into the lattice, inducing point defects and oxygen vacancies in the optical bandgap region, resulting in broadband violet-blue photoluminescence.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Chemistry, Applied
Rajesh Kumar, Sumanta Sahoo, Ednan Joanni, Rajesh Kumar Singh
Summary: This article introduces the advantages of microwave heating in the processing of graphene-based electrode materials and provides a systematic overview of recent research on microwave-assisted processing, focusing on the preparation and modification of graphene derivatives for supercapacitors. Finally, the major challenges and future perspectives for microwave-assisted processing of graphene-based materials are summarized.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Physical
Ivana Soares, Francisco X. Nobre, Raimundo Vasconcelos, Miguel A. Ramirez
Summary: This study explores the possibility of using plastic waste as a substitute for sand in mortar production and tests it with two types of activators. The results show that a higher replacement of sand with plastic waste leads to a lower compressive strength, increased porosity, and efflorescence formation. However, the use of a compound activator improves the density and reduces porosity, inhibiting efflorescence formation and resulting in higher compressive strength.
Article
Materials Science, Multidisciplinary
A. Z. Simoes, P. P. Ortega, M. A. Ramirez, H. Moreno, C. M. Aldao, M. A. Ponce, F. Moura
Summary: This study focuses on the synthesis of LTO thin films via the polymeric precursor method and their deposition onto STO substrates using spin coating. The results demonstrate the coexistence of ferromagnetic and ferroelectric responses in the LTO/STO heterojunctions at room temperature. Magnetoelectric coupling is observed under a DC bias magnetic field, and the dielectric constant is affected by the coupling between magnetic and electric dipoles as well as oxygen octahedra distortion. The film-substrate mismatch significantly influences the system's dielectric properties. Overall, this study provides insights into inducing ferromagnetic/ferroelectric phases and understanding oxygen vacancy dynamics for various electronic devices.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Environmental Sciences
Carlos Eduardo Tino Balestra, Lilyanne Rocha Garcez, Leandro Couto da Silva, Marcia Teresinha Veit, Eliziane Jubanski, Alberto Yoshihiro Nakano, Marina Helena Pietrobelli, Ricardo Schneider, Miguel Angel Ramirez Gil
Summary: Nearly 10% of global CO2 emissions come from Portland cement production. Limestone-Calcined Clay Cement (LC3) is proposed as an alternative with reduced CO2 levels. This study assessed LC3 concretes with different supplementary cementitious materials (SCMs) and found that high superplasticizer dosages are needed. There was competition between SCMs and calcined clay, reducing compressive strength. However, all LC3 concretes had higher carbonation fronts compared to Portland cement concrete.
ENVIRONMENTAL DEVELOPMENT
(2023)
Article
Chemistry, Physical
G. Acero, H. Moreno, P. P. Ortega, M. A. Ramirez, M. A. Ponce, F. Moura, A. Z. Simoes
Summary: This research investigates the domain structure of BaBiO3 thin films obtained by the polymeric precursor method and reveals the influence of bismuth and oxygen vacancies, grain morphology, and stoichiometric changes on the piezo-ferroelectric coupled behavior. The highly textured BBO55 film shows superior piezoelectric and ferroelectric responses compared to BBO37 and BBO82, making it a promising lead-free material for electronic components.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Environmental Sciences
Lucas Felix da Costa Goncalves, Carlos Eduardo Tino Balestra, Miguel Angel Ramirez Gil
Summary: With the aim of producing modular bricks with reduced environmental impacts, this study utilized alkali activation technique to create bricks using clay soil, sand, metakaolin or blast furnace slag. The results showed that the use of compound activator significantly improved the performance of the bricks, including water absorption and compressive strength. Microstructural analysis confirmed the formation of various micro structures from the alkali activation reactions. Life Cycle Analysis indicated that alkali activated bricks emitted at least 35% less CO2 compared to ceramic bricks. Overall, modular bricks made with metakaolin or blast furnace slag and compound activator demonstrated great potential for sustainable brick production.
ENVIRONMENTAL DEVELOPMENT
(2023)
Article
Chemistry, Multidisciplinary
Ednan Joanni, Rajesh Kumar, Willians P. Fernandes, Raluca Savu, Atsunori Matsuda
Summary: In this article, we present a new laser processing method that combines in situ graphitization of polyimide with simultaneous transfer of graphene patterns onto various substrates. The synthesis conditions are similar to those of the well-known laser-induced graphene method. This approach involves enclosing polyimide sheets between microscope glass slides and has successfully generated graphene patterns on glass and PDMS substrates, as well as graphene decorated with metals and oxides. To illustrate its usefulness, this method was applied to the fabrication of hybrid supercapacitors which exhibited excellent electrochemical performance.
Review
Chemistry, Physical
Sumanta Sahoo, Rajesh Kumar, Ednan Joanni, Rajesh Kumar Singh, Jae-Jin Shim
Summary: This article systematically surveys the current state of the art regarding the fabrication and electrochemical performance of the most promising classes of pseudocapacitive/battery-type electrode materials for supercapacitors. It covers metal oxides, mixed metal oxides, conducting polymers, and MXenes. The article discusses outstanding problems for increasing the performance of supercapacitors and suggests future research directions.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
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)
