Article
Chemistry, Physical
Liang Sun, Lifeng Zhu, Chunli Zhang, Weiqiu Chen, Zhonglin Wang
Summary: This study utilizes flexoelectricity to control the performance of silicon-based SBDs, finding significant impact on various performance indicators. Current-voltage characteristics of the SBD under different tip forces were measured using C-AFM, confirming the important role of flexoelectricity.
Article
Engineering, Electrical & Electronic
Razvan Pascu, Cosmin Romanitan
Summary: An experimental study on the effects of post-metallization annealing treatments in inert atmosphere on metal/semiconductor junctions was conducted. Significant improvements in microstructure changes and electrical parameters were observed, including a reduction in contact resistance and specific contact resistivity.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Physics, Applied
Junxue Ran, Rui He, Lulu Wang, Bingzhi Liu, Xiaoli Ji, Jingyu Sun, Junxi Wang, Jinmin Li, Tongbo Wei
Summary: Pt/Al0.75Ga0.25N Schottky barrier diodes (SBDs) with and without a graphene interlayer were fabricated and their electrical characteristics were analyzed. The results showed that the presence of the graphene interlayer improved the performance of the SBDs, leading to a higher barrier height and more uniform barrier distribution.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Materials Science, Ceramics
Hyeon-Min Yu, Su-Hwan Go, Seok-June Chae, Yeon-Gyeong Chae, Eun-Ji Kim, Jae-Min Eum, Hyun Ryu, Sahn Nahm
Summary: A ceramic with a large dielectric constant for X8R MLCC was fabricated by sintering 0.96BT-0.04BMT + y wt.% Nb2O5 ceramics at 1275℃, forming a core-shell structure. The addition of Nb2O5 resulted in a broad shell-region phase-transition peak and a decreased Er of the core-region phase-transition peak, leading to a large Er of 2285 and good temperature stability for the sample with y = 1.25. By using 0.1 wt% BaO-CaO-SiO2 to reduce the sintering temperature, a 9-layered MLCC produced with BCS-doped 0.96BT-0.04BMT + 1.25 wt% Nb2O5 ceramic at 1200℃ showed a large capacitance of 67 nF and complied with EIA-X8R regulations.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Guoqing Shao, Juan Wang, Zhangcheng Liu, Yanfeng Wang, Wei Wang, Hong-Xing Wang
Summary: Introducing LaB6 into diamond SBD can improve its SBH and reverse breakdown capability. LaB6 significantly reduces the interface states density of diamond SBD, showing great potential for higher performance.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Jun-Dar Hwang, Zi-Jun Hong
Summary: The study showed that inserting a thin MgO layer between Au and annealed-ZnO in Schottky-barrier diodes can significantly reduce leakage current and enhance rectification ratio, leading to an increased Schottky-barrier height.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Multidisciplinary Sciences
Fan Ye, Kan-Hao Xue, Heng Yu, Shengxin Yang, Jun-Hui Yuan, Rongchuan Gu, Ming Xu, Xiangshui Miao
Summary: This study systematically investigates the impact of different dopants on the tuning of Schottky barriers in rutile TiO2-based capacitors, and finds that yttrium doping is the most effective in reducing the leakage current problem.
ADVANCED THEORY AND SIMULATIONS
(2023)
Article
Materials Science, Ceramics
Hanyu Zhang, Zhong Yu, Xiaona Jiang, Xiaofeng Zhang, Qianfa Su, Jie Zhuo, Chuanjian Wu, Qifan Li, Ke Sun, Zhongwen Lan
Summary: Nickel-zinc ferrite (NZF) and magnesium calcium titanite (MCT) were co-fired at adjusted temperatures to achieve matching sintering shrinkage. The ion diffusion mechanism at the co-fired joint interface was investigated using EPMA and the infinite diffusion coupling model. The results showed that Zn2+ ions had the highest diffusion coefficient, Ca2+ ions had the lowest diffusion coefficient and segregated along the MCT interface, and Fe3+ ions had the biggest diffusion width due to interstitial diffusion in the incompletely densified MCT. The interdiffusion width was narrow at 1260 degrees C and increased with higher temperatures.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Applied
Yibo Wang, Wenhui Xu, Genquan Han, Tiangui You, Fengwen Mu, Haodong Hu, Yan Liu, Xinchuang Zhang, Hao Huang, Tadatomo Suga, Xin Ou, Xiaohua Ma, Yue Hao
Summary: The article reports on the interface performance of the beta-Ga2O3((2) over bar 01)/TiN Schottky barrier diode (SBD) on a heterogeneous integrated Ga2O3-Al2O3-Si (GaOISi) substrate. The SBD exhibits stable characteristics and consistent on-state to off-state current ratio at different temperatures. Additionally, the effective barrier height φ(B, eff) decreases with increasing temperature, leading to a decrease in V-on.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Wei Li, Qingrui Jia, Hongjiao Dong, Zi'ang Wang, Yucheng Wang, Yupan Wu, Xiaodong Zhao, Zhao Chen, Shaoxi Wang
Summary: Compared to traditional materials, two-dimensional transition metal dichalcogenides (2D TMDCs) have potential applications in low power logic, photoelectric, and nonvolatile memory devices. This study focuses on the use of ReS2 as the channel material and BN as the gate dielectric. The results demonstrate that ReS2 devices, with or without BN, exhibit outstanding photoresponsivity and fast photoresponse time under extremely low optical power density. Furthermore, the influence of ReS2 channel thickness on mobility and photoresponsivity was also investigated.
ACS APPLIED NANO MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Sanghun Han, Taemyung Kwak, Uiho Choi, Hyeonu Kang, Geunho Yoo, Seong-woo Kim, Okhyun Nam
Summary: This study demonstrates the growth of p-type lateral-structure diamond Schottky barrier diodes (SBDs) on a heteroepitaxial diamond substrate using a thin atomic-layer-deposited hafnium oxide (HfO2) interfacial layer. Two kinds of SBDs are grown on heteroepitaxial diamond substrates with a 10 nm HfO2 interlayer. The HfO2 interlayer reduces the inhomogeneous Schottky barrier height and enhances the barrier height due to the reduction in the interface state density.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Wenjun Zhang, Qian Wang, Liang Hu, Jiansheng Wu, Xingqiang Shi
Summary: Through density-functional theory calculations, this study investigates the interlayer interaction between metal and few-layer MoS2, proposing phase-engineering and intercalation doping as methods to improve contact performance, both of which can tune the Schottky barrier height.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Physics, Condensed Matter
A. F. Ozdemir, T. Goksu, N. Yildirim, A. Turut
Summary: The thickness of Ti Schottky contact metal affects the barrier potential value, with a difference of 0.12 eV observed at 300 K between thicknesses of 50 nm and 100 nm. The ideality factor remains unchanged with increasing metal thickness.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Min-Yeong Kim, Dong-Wook Byun, Geon-Hee Lee, Sujitra Pookpanratana, Qiliang Li, Sang-Mo Koo
Summary: The Schottky contact plays a crucial role in the electrical properties of Schottky barrier diodes (SBDs). This study investigated the carrier transport mechanisms and electrical characteristics of SBDs with pre-treated Ga2O3 thin films and Ni or Au Schottky contacts. The results showed that the pre-treated Ni SBDs exhibited the highest on/off ratio at room temperature and stable ideality factors and Schottky barrier heights between 298 K and 523 K. Additionally, SBDs with Ni as the anode material had lower Schottky barrier heights compared to those with Au.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Engineering, Electrical & Electronic
Sosorburam Boldbaatar, V. Janardhanam, Munkhsaikhan Zumuukhorol, Hoon-Ki Lee, Hae-Yong Lee, Hyo Jung Kim, Kyu-Hwan Shim, Chel-Jong Choi
Summary: We investigated Ni Schottky contacts on alpha-Ga2O3 epitaxial layers and studied their current-voltage characteristics at temperatures ranging from 100 to 425 K. The Ni/alpha-Ga2O3 Schottky diode showed excellent rectification with a high barrier height of 1.39 eV, a low leakage current of around 10-12 A, and a breakdown voltage of 215 V at room temperature. The temperature dependence of the barrier height and ideality factor indicated the presence of barrier inhomogeneity at the Schottky interface, with a transition occurring at 250 K.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Chemistry, Physical
Mao-Hua Zhang, Niloofar Hadaeghi, Sonja Egert, Hui Ding, Hongbin Zhang, Pedro B. Groszewicz, Gerd Buntkowsky, Andreas Klein, Jurij Koruza
Summary: In this study, a general approach was demonstrated to promote the reversibility of the unique electric-field-induced phase transition in antiferroelectric materials by modifying the material's local structure. A new composition based on NaNbO3, (1- x)NaNbO3-xSrSnO(3), was designed using first-principles calculations and experimental characterization. The results showed that the addition of SrSnO3 can enhance the stability of the antiferroelectric order and increase the energy storage density of the modified compositions.
CHEMISTRY OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Katharina N. S. Schuldt, Hui Ding, Jean-Christophe Jaud, Jurij Koruza, Andreas Klein
Summary: The study on Schottky barrier formation between polycrystalline acceptor-doped BaTiO3 and high work function RuO2 using photoelectron spectroscopy revealed that the barrier height for electrons is approximately 1.4 eV, independent of doping level and oxygen vacancy concentration of the substrates. The high permittivity of BaTiO3 results in wider space-charge regions, making SCRs more important for electronic and ionic conductivities in BaTiO3 compared to materials with lower permittivity. A Ba-rich phase at the surface of reduced acceptor-doped BaTiO3 is also identified, explained by the formation of Ti vacancies in the 2D electron gas region at the surface.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Philipp Wendel, Dominik Dietz, Jonas Deuermeier, Andreas Klein
Summary: ZnO/RuO2 Schottky diodes prepared by magnetron sputtering exhibit reversible hysteresis behavior in their current-voltage characteristics, with the Schottky barrier height varying between 0.9 and 1.3 eV during voltage cycling. This variation is attributed to trapping and de-trapping of electrons in oxygen vacancies.
Article
Chemistry, Physical
Raphael Poulain, Jochen Rohrer, Yannick Hermans, Christian Dietz, Joachim Brotz, Joris Proost, Marian Chatenet, Andreas Klein
Summary: The interaction between water and oriented NiO films was studied using a combination of photoelectron spectroscopy, in situ sample preparation, and electrochemical measurements. The exposure to room temperature water induced a more positive surface charge on the (110)- and (111)-oriented films compared to NiO(100), which was attributed to dissociative adsorption of water and removal of oxygen. This explains the role of water as an electron donor on oxide surfaces.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Hans F. Wardenga, Katharina N. S. Schuldt, Stephan Waldow, Roger A. De Souza, Andreas Klein
Summary: The study investigated the influence of different doping methods, concentrations, and surface orientations on the surface Fermi level positions, ionisation potentials, and work functions of CeO2. It was found that the ionisation potentials are significantly affected by doping and oxygen activity, while the work functions are largely unaffected. In terms of oxygen surface exchange coefficients, similar magnitudes were observed under different conditions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Elaheh Ghorbani, Lorenzo Villa, Paul Erhart, Andreas Klein, Karsten Albe
Summary: This study presents a systematic assessment of the behavior of self-trapped electrons in PbTiO3, a prototypical ferroelectric material with various technological applications. The study aimed to identify the parameters used in density functional theory (DFT) that accurately predict the properties of self-trapped electrons. It was found that the choice of pseudopotential and lattice parameters significantly influenced the magnitude of the trapping energy. A comparison of two different functionals showed the DFT-PU result to be close to the HSE06 result. The study also provided configuration coordinate diagrams for the polaron-associated absorption and luminescence peaks in PbTiO3.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Nicole Bein, Brigita Kmet, Tadej Rojac, Andreja Bencan Golob, Barbara Malic, Julian Moxter, Thorsten Schneider, Lovro Fulanovic, Maryam Azadeh, Till Froemling, Sonja Egert, Hongguang Wang, Peter van Aken, Jutta Schwarzkopf, Andreas Klein
Summary: The valence band maximum energy of NaNbO3 is determined and found comparable to SrTiO3 and BaTiO3, while the conduction band minimum is yet to be determined. In addition, Sr- and Ca-doped NaNbO3 ceramics exhibit low electrical conductivity.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Julia E. Medvedeva, Bishal Bhattarai, Ivan A. Zhuravlev, Federico Motti, Piero Torelli, Anita Guarino, Andreas Klein, Emiliano Di Gennaro, Fabio Miletto Granozio
Summary: Understanding the short-range structure of amorphous materials is crucial for predicting their macroscopic properties. This study investigates the contradictory experimental findings regarding the oxygen environment of titanium in amorphous strontium titanate and reveals that the discrepancy is caused by differences in the material's density. The study also analyzes the density-dependent structural characteristics and electronic properties of amorphous strontium titanate, providing insights into the structure-property relationship.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Chemistry, Physical
Issei Suzuki, Binxiang Huang, Sakiko Kawanishi, Takahisa Omata, Andreas Klein
Summary: This study demonstrates that the Fermi energy of SnS at the interface can be shifted through the entire band gap, indicating the absence of Fermi-level pinning. The mechanisms behind the existence or lack of Fermi-level pinning at SnS interfaces were discussed, and suggestions were offered to achieve higher photovoltages by avoiding Fermi-level pinning in SnS solar cells.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Physics, Applied
Yunwei Sheng, Mathieu Mirjolet, Mario Villa, Jaume Gazquez, Jose Santiso, Andreas Klein, Jordi Fraxedas, Josep Fontcuberta
Summary: Epitaxial LaFeO3-based photocells with different thicknesses were grown on LSAT single-crystal substrates, using LSMO and Pt/BLSO electrodes, to determine their photoresponse. The short-circuit photocurrent initially increases and then decreases with LFO thickness, and is larger or smaller with Pt or BLSO electrodes. The open-circuit voltage shows the opposite trend, being smaller or larger with Pt and BLSO, respectively, consistent with the electronic band alignments and rectifying character of the dark current-voltage data. The complex microstructure and grain boundaries of the films play a significant role in the observed responsivity, which is larger than in similar LFO-based structures.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Physical
Shanmugapriya Periyannan, Laura Manceriu, Andreas Klein, Wolfram Jaegermann, Catherine Henrist, Rudi Cloots
Summary: In this study, a surface cleaning procedure involving vacuum annealing under oxygen was employed to clean the ZNR scaffold film's surface before NiO deposition for heterostructure formation. The properties of the scaffold were studied and correlated to the NiO/ZNR interface and photo-response properties. The optimized NiO/ZNR showed improved photo-response and photodegradation efficiency compared to the ZNR scaffold.
Article
Chemistry, Multidisciplinary
Binxiang Huang, Paul Erhart, Tongqing Yang, Andreas Klein
Summary: Interface stability is crucial for the reliable performance of electronic and electrochemical devices. In this study, an operando analysis approach using photoelectron spectroscopy in a solid oxide electrochemical cell was introduced to investigate interfaces. The experiment provided chemical and electronic information, revealing the importance of both chemical and electrostatic boundary conditions for interface stability. The approach was demonstrated using (anti-)ferroelectric (Pb,La)(Zr,Sn,Ti)O-3 dielectrics.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Issei Suzuki, Zexin Lin, Taichi Nogami, Sakiko Kawanishi, Binxiang Huang, Andreas Klein, Takahisa Omata
Summary: Recently, it has been reported that there is a large band bending at the interface between n-type single crystalline SnS and MoO3, which has a high work function. In this study, we applied this interface to solar cells for the first time and evaluated its photovoltaic properties. The highest achieved open-circuit voltage (V-OC) was 437 mV, which is lower than the expected value but the highest recorded for SnS solar cells. The highest power conversion efficiency (PCE) was 4.4%. Based on device parameter analysis, we propose methods for improving the device performance, including V-OC, short-circuit current, and PCE. The study also estimated the carrier-collection length of n-type SnS single crystals to be around 200 nm using external quantum efficiency measurements. This study demonstrates that the V-OC of SnS solar cells can be improved by fabricating a junction with MoO3 thin films.
Article
Materials Science, Ceramics
Andreas Klein, Karsten Albe, Nicole Bein, Oliver Clemens, Kim Alexander Creutz, Paul Erhart, Markus Frericks, Elaheh Ghorbani, Jan Philipp Hofmann, Binxiang Huang, Bernhard Kaiser, Ute Kolb, Jurij Koruza, Christian Kuebel, Katharina N. S. Lohaus, Juergen Roedel, Jochen Rohrer, Wolfgang Rheinheimer, Roger A. Souza, Verena Streibel, Anke Weidenkaff, Marc Widenmeyer, Bai-Xiang Xu, Hongbin Zhang
Summary: Chemical substitution is a primary strategy for tailoring material properties, with isovalent and heterovalent substitution being the two types. By controlling the different compensation mechanisms, it is possible to predict and adjust material properties. The Fermi energy can be used as a common descriptor for these mechanisms.
JOURNAL OF ELECTROCERAMICS
(2023)
Article
Engineering, Electrical & Electronic
Raphael Poulain, Gunnar Lumbeeck, Jonas Hunka, Joris Proost, Henri Savolainen, Hosni Idrissi, Dominique Schryvers, Nicolas Gauquelin, Andreas Klein
Summary: Although there are contradictory results on the properties of nickel oxide (NiO) in the literature, this comprehensive study provides valuable insights into the conductivity, surface properties, and charge defects compensation mechanism of NiO materials. The experiments reveal that the surface and bulk properties of NiO are strongly influenced by the deposition temperature, leading to variations in the Fermi level pinning, work function, and grain boundaries. This study contributes to a better understanding of the electrical conductivity and charge compensation mechanism of NiO thin films.
ACS APPLIED ELECTRONIC MATERIALS
(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)
