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Peeking the Glass Phase in the Grain Boundary of Na3zr2si2po12 by Gallium Modulation

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SSRN 2023年

作者： Lou, Chenjie Zhang, Wenda Liu, Jie Gao, Yanan Sun, Xuan Fu, Jipeng Shi, Yongchao Xu, Ligang Chen, Yongjin Gao, Xiang Kuang, Xiaojun Su, Lei Tang, Mingxue Center for High Pressure Science and Technology Advanced Research Beijing100193 China University of Science and Technology Beijing Beijing100083 China MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials Guangxi Key Laboratory of Optical and Electronic Materials and Devices Guangxi Universities Key Laboratory of Nonferrous Metal Oxide Electronic Functional Materials and Devices College of Materials Science and Engineering Guilin University of Technology China China Key Laboratory of Rare Earth Optoelectronic Materials and Devices of Zhejiang Province Institute of Optoelectronic Materials and Devices China Jiliang University Hangzhou310018 China Narada Power Source Co. Ltd. Hangzhou311305 China

Na3Zr2SiPO12 was proven as a promising electrolyte in solid-state sodium batteries. However, its poor conductivity precludes application because of the large ionic resistance caused by grain boundary. Herein we proposed an additional glass phase to connect the grain boundary via Ga2O3 introduction, resulting in enhanced sodium-ion conduction and electrochemical performance. The optimized Na3Zr2SiPO12-0.15Ga electrolyte exhibits Na+ conductivity of 1.65 mS cm-1 at room temperature and a low activation energy of 0.16 eV, with 20% newly formed glass phase enclosing the grain boundary from NMR analysis. Temperature-dependent NMR line shapes and spin-lattice relaxation were used to demonstrate the estimation of Na self-diffusion and Na ion hopping. The strategy of design dense glass-ceramic electrolyte and the structure-dynamics-property correlation from NMR can be extended to wider optimization in material community. © 2023, The Authors. All rights reserved.

关键词： Solid-state Batteries

Necking and Softening Affected by Grain Shape and Grain Boundary Sliding in Selective Laser Melted Β-Ti Alloy

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SSRN 2024年

作者： Xie, Qingge Feng, Kaihang Chu, Qingkun Yan, Xingchen Liu, Min Yu, Donghai Yin, Shuo Wang, Yandong Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing Beijing100083 China National Engineering Laboratory for Modern Materials Surface Engineering Technology The Key Lab of Guangdong for Modern Surface Engineering Technology Institute of New Materials Guangdong Academy of Sciences Guangzhou510651 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China Trinity College Dublin The University of Dublin Department of Mechanical Manufacturing and Biomedical Engineering Parsons Building Dublin 2 Ireland Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing Beijing100083 China

No strain hardening of the Ti-12Mo-6Zr-2Fe alloy has been ascribed to a dynamic recovery effect. However, in our recent tests, grain boundary sliding (GBS) induced softening and cracks occurrence at grain boundaries (GBs) were identified for tensile deformation in the same alloy prepared by selective laser melting (SLM). Obviously twisted morphologies of melt pool due to sliding along GBs or sub-GBs provide evidences of GBS. Samples with columnar grains aligned // loading direction (LD) featured faster softening and failure than those with columnar grains ⊥ LD. In the deformation microstructure, there was more significant GBS in the former than in the latter. Typically, columnar grains // LD featured the following: (1) the lattice rotation axis of grain fragments is mainly // or ⊥ or at ~45° to LD. (2) The smashed grains separated by nodule-like deformation bands often featured a bamboo-like structure, which is expected to promote failure. (3) Both Rachinger sliding and Lifshitz sliding were identified. (4) Deformation grains occasionally featured a circle-like orientation distribution in the {101} pole figure with various lattice rotation axes, and it is intensified by necking. Also, the occurrence of fracture edge at ~45° to LD correlates to the grain-shape effect on necking. The present paper not only provides microscopic insights on GBS for samples with large grain size, which is normally suspected not to favor GBS, but also explores the columnar grain shape effect on damage anisotropy. Both contribute to a fundamentally understanding on the damage anisotropy of the SLM processed β-Ti alloy. © 2024, The Authors. All rights reserved.

关键词： Strain hardening

Bilayer metal halide perovskite for efficient and stable solar cells and modules

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材料展望（英文）

材料展望（英文） 2022年第4期 49-68页

作者： Yanqing Zhu Min Hu Mi Xu Bo Zhang Fuzhi Huang Yi-Bing Cheng Jianfeng Lu State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070People's Republic of China School of Electronic and Electrical Engineering Hubei Province Engineering Research Centre for Intelligent Micro-Nano Medical Equipment and Key TechnologiesWuhan Textile UniversityWuhan 430200People's Republic of China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528216People's Republic of China Shanxi Lu'An Photovoltaics Technology Co. LtdChangzhi 046011People's Republic of China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528216People's Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People's Republic of China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070People's Republic of China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528216People's Republic of China

To reach the target of carbon neutral,a transition from fossil energy to renewable energy is *** technology is considered one of the most prominent sources of renewable ***,metal halide perovskite materials have attracted tremendous interest in the areas of optoelectronic devices due to their ease of processing and outstanding *** date,perovskite solar cells(PSCs)have shown high power conversion efficiency up to 25.7％and 31.3％for the perovskite-silicon tandem solar cells,which promises to revolutionize the PV ***,the stability of PSCs under operating conditions has yet to match state-of-the-art silicon-based solar cell technology,in which the stability of the absorbing layer and relevant interfaces is the primary *** issues become more serious in the larger area solar modules due to the additional interfaces and more defects within the *** perovskite film composed of a thin low dimensional perovskite layer and a three-dimensional perovskite layer shows great potential in fabricating solar cells with high efficiency and stability *** this review,recent advancements,including composition design and processing methods for constructing bilayer perovskite films are *** then analyze the challenges and resolutions in deposition bilayer perovskite films with scalable *** summarizing the beneficial effect of the bilayer structure,we propose our thinking of feasible strategies to fabricate high efficiency perovskite solar modules with a long ***,we outline the directions for future work that will push the perovskite PV technology toward commercialization.

关键词： perovskite solar cell perovskite solar module bilayer stability scalable technique

High-order phonon anharmonicity and thermal conductivity in GaN

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Physical Review B 2024年第15期109卷 155204-155204页

作者： Bin Wei Yongheng Li Wang Li Kai Wang Qiyang Sun Xiaolong Yang Douglas L. Abernathy Qilong Gao Chen Li Jiawang Hong Yuan-Hua Lin Henan Key Laboratory of Materials on Deep-Earth Engineering School of Materials Science and Engineering Henan Polytechnic University Jiaozuo 454000 China School of Aerospace Engineering Beijing Institute of Technology Beijing 100081 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 People's Republic of China Department of Mechanical Engineering University of California Riverside Riverside California 92521 USA College of Physics and Center of Quantum Materials and Devices Chongqing University Chongqing 401331 China Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA International Laboratory for Quantum Functional Materials of Henan School of Physics and Microelectronics Zhengzhou University Zhengzhou 450001 China

A comprehensive understanding of phonon transport is essential to develop effective solutions for heat dissipation. Gallium nitride (GaN), a representative of third-generation power semiconductors, has been extensively studied regarding its thermodynamics and lattice dynamics. However, the temperature-dependent phonon properties, especially the anharmonicity at high temperatures, are poorly understood. Here, by combining inelastic neutron scattering (INS) experiments and calculations including the temperature effect based on machine learning potentials, we report the high-order phonon anharmonicity in GaN over a wide temperature range. Our calculations agree well with the experimental phonon dispersion, density of states and entropy, underlining the significance of anharmonicity of GaN at elevated temperatures. Moreover, considering the four-phonon processes, the calculated thermal conductivity is suppressed by 20%, and the anisotropy is also reduced gradually with increasing temperature. Such behavior arises mainly from the large four-phonon scattering channels between 20 and 30 meV, where the critical scattering rule for the three-phonon process is largely restricted at high temperatures. Our study highlights the importance of high-order phonon anharmonicity for thermal transport in GaN and provides a theoretical reference for thermal management in other related semiconductors.

关键词： Thermal conductivity Semiconductors Boltzmann theory Density functional theory Inelastic neutron scattering

Effect of Strain Rates on Mechanical Behavior, Microstructure Evolution and Failure Mechanism of Extruded-Annealed Az91 Magnesium Alloy Under Room-Temperature Tension

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SSRN 2023年

作者： Chai, Fang Ma, Zhiyuan Han, Xinghui Hu, Xuan Chang, Zhenyu Zhou, Jianxin Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan China Hubei Engineering Technology Center for New Energy and Intelligent Connected Vehicles Wuhan University of Technology Wuhan China Hubei Longzhong Laboratory Hubei Xiangyang441000 China State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan430074 China

Loading rate is usually considered as a significant factor affecting formability of AZ91 magnesium alloy structural components. Herein, uniaxial tensile tests are conducted on extruded-annealed AZ91 alloy under room temperature with strain rates ranging from 1×10-4 s-1 to 1×10-2 s-1. The mechanical properties, microstructure characteristics, and fracture morphologies tensioned at these different strain rates are investigated. Meanwhile, deformation process and atomic microstructures during uniaxial tensile loading is examined through molecular dynamics simulation. Extruded-annealed AZ91 magnesium alloys exhibits a positive strain-rate dependence of strength and a negative strain-rate dependence of elongation, and both strain rate sensitivity and strain-hardening rate under higher strain rate are much higher than those under lower strain rate. The larger strength at higher strain rate is mainly attributed to the more rapid accumulation of dislocation and the larger dislocation density, and the lower elongation at higher strain rate is mostly owing to the more elevated level of inhomogeneous deformation related with dislocations accumulation. As strain rate increases, the area fraction of basal texture increases while that of prismatic and pyramid texture decreases in tensioned samples, which is associated with the dominant room-temperature deformation mode of basal-slip-induced lattice rotation. With tension strain rate increasing, there are three kinds of fracture modes including ductile facture with more and deeper dimples at low strain rate, ductile-brittle facture with some dimples and cleavage planes at mediate strain rate and brittle facture with dominant cleavage planes at high strain rate. © 2023, The Authors. All rights reserved.

关键词： Room temperature

Persistent Josephson tunneling between Bi2Sr2CaCu2O8+x flakes twisted by 45∘ across the superconducting dome

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Physical Review B 2023年第17期108卷 174508-174508页

作者： Yuying Zhu Heng Wang Zechao Wang Shuxu Hu Genda Gu Jing Zhu Ding Zhang Qi-Kun Xue Beijing Academy of Quantum Information Sciences Beijing 100193 China Hefei National laboratory Hefei 230088 China State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China National Center for Electron Microscopy in Beijing School of Materials Science and Engineering Key Laboratory of Advanced Materials (MOE) The State Key Laboratory of New Ceramics and Fine Processing Tsinghua University Beijing 100084 China Ji Hua Laboratory Foshan Guangdong 528200 China Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Upton New York 11973 USA RIKEN Center for Emergent Matter Science (CEMS) Wako Saitama 351-0198 Japan Southern University of Science and Technology Shenzhen 518055 China

There is a heated debate on the Josephson effect in twisted Bi2Sr2CaCu2O8+x flakes. Latest results suggest the presence of either anomalously isotropic pairing or exotic d+id-wave pairing, in addition to the commonly believed d-wave one. Here, we address this controversy by fabricating ultraclean junctions with uncompromised crystalline quality at the junction interface. In the optimally doped regime, we obtain prominent Josephson coupling (2–4 mV) in multiple junctions with the twist angle of 45∘, in sharp contrast to a recent report that shows two orders of magnitude suppression around 45∘ from the value at 0∘. We further extend this study to the previously unexplored overdoped regime and observe pronounced Josephson tunneling at 45∘ together with Josephson diode effect up to 50 K. Our study helps establish the persistent presence of an isotropic pairing component across the entire superconducting phase diagram.

关键词： Josephson effect Pairing mechanisms Superconducting phase transition Cuprates Diodes High-temperature superconductors Monolayer films Superconducting devices Twisted heterostructures

Study of the Effect of Impregnation on Continuous Carbon Fibers Reinforced Sic Ceramic Composites Prepared Via Material Extrusion and Reactive Melting Infiltration

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SSRN 2022年

作者： Liu, Kai Qiu, Lei Zhang, Yuzhen Du, Yanying Sun, Ce Lu, Chao Zhang, Song Tu, Rong Wu, Yanjiao Sun, Huajun Shi, Yusheng State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China School of Logistics Engineering Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Ningbo volken Technology Co. Ltd Ningbo315000 China State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan430074 China

This paper presents a new method for the efficient preparation of continuous carbon fibers reinforced SiC ceramic (Cf/SiC) composites using material extrusion (MEX) and reactive melting infiltration (RMI). A slurry with the ability to produce stable filaments with good surface quality has been obtained by comparing the rheological behavior. The resin impregnation-carbonization and RMI processes were used for densification to obtain Cf/SiC composites. The effect of the number of impregnation-carbonization on the properties and microstructure of the sintered bodies has been studied. When the impregnation-carbonization was used for 1 time, the specific strength of the sintered body reached the highest value of 4.5 [[EQUATION]] 10 4 N·m/kg and the bending strength reached 93.1±4.3 MPa. In addition, Cf/SiC with complex structures were prepared using this method. This new approach reveals significant potential for MEX printing technology to prepare Cf/SiC composites with complex and lightweight structures. © 2022, The Authors. All rights reserved.

关键词： Carbon fibers

Emerging heterostructured C3N4 photocatalysts for photocatalytic environmental pollutant elimination and sterilization

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Inorganic Chemistry Frontiers 2023年第13期10卷 3756-3780页

作者： Yang Ding Chunhua Wang Lang Pei Soumyajit Maitra Qinan Mao Runtian Zheng Meijiao Liu Yun Hau Ng Jiasong Zhong Li-Hua Chen Bao-Lian Su Center of Advanced Optoelectronic Materials College of Materials and Environmental Engineering Hangzhou Dianzi University Hangzhou 310018 China School of Energy and Environment City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong China Department of Materials University of Oxford Oxford UK Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles Namur Belgium Department of Chemistry Zhejiang Sci-Tech University Hangzhou 310018 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road 430070 Wuhan Hubei China

Photocatalysis is deemed a highly prominent technology to solve environmental problems such as pollution, CO2 emission and bacterial contamination. As an important photocatalyst, g-C3N4 has attracted a great amount of...

Photocatalysis is deemed a highly prominent technology to solve environmental problems such as pollution, CO₂ emission and bacterial contamination. As an important photocatalyst, g-C3N4 has attracted a great amount of attention in environmental remediation owing to its good stability, excellent light response, low cost and environmentally friendly properties. However, the pristine g-C3N4 photocatalyst generally suffers from serious photoinduced charge carrier recombination, poor surface active sites, and insufficient visible light harvesting, thereby leading to unsatisfactory photocatalytic performance. Heterostructured C₃N₄ photocatalysts have recently become a research focus in environmental fields thanks to their fast photoexcited electron–hole pair dissociation, broadened visible light response range, and sufficient photoredox capability. Herein, we critically review the up-to-date developments of heterostructured C₃N₄ photocatalysts in organic pollutant elimination, heavy metal ion reduction, CO₂ conversion and bacterial inactivation. Meanwhile, the strategies for constructing efficient C₃N₄ based heterostructures with enhanced environmental photocatalytic capability are thoroughly described, which should help readers to quickly acquire in-depth knowledge and to inspire new concepts in heterostructure engineering. Finally, the challenges and opportunities in fabricating heterostructured C₃N₄ photocatalysts for large-scale and commercial applications are discussed to give a clear study direction in this field.

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Control the Explosive Polymerization of 1,3-Dioxolane in Lipf6 Electrolyte by Lewis Acid-Base Interactions

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SSRN 2024年

作者： Yang, Xueting Deng, Haoyu Xu, Jie Ye, Dezhan Jiang, Xiancai Chen, Yazhou Liu, Zengjin State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University No.1 Yangguang Avenue Jiangxia District Hubei Wuhan430200 China School of Materials Science and Engineering Wuhan Textile University No.1 Yangguang Avenue Jiangxia District Hubei Wuhan430200 China School of Chemical Engineering Fuzhou University Fuzhou350108 China Drug Research Center of Integrated Traditional Chinese and Western Medicine Affiliated Traditional Chinese Medicine Hospital of Southwest Medical University No.182 Chunhui Road Longmatan District Sichuan Province Luzhou City646000 China

In order to initiate1,3-dioxolane (DOL) polymerization, catalyst amount of lithium hexafluorophosphate (LiPF6) is usually used rather than as the main lithium salt. Replacement of Lithium bis(trifluoromethanesulphonyl)imide with LiPF6 would bring the heat explosion and high viscosity when DOL is mixed with 0.9M LiPF6 electrolyte. Here, based on the Lewis acid-base interaction, Lewis base from pyridine, is added to control the explosive polymerization of DOL in LiPF6 electrolyte. Through tuning the pyridine content, the gelling process and electrochemical properties are controlled. It is demonstrated that monomer conversion and electrochemical window stability are inversely related with the pyridine addition, which are up to 85.2% and 4.5V, respectively. The optimized conductivity and transfer number are 0.99×10-3 S/cm (25oC) and 0.68, respectively. The stable interface between PDOL and lithium metal anode is proved by the stable over-potential (50mv, 700 hours) at current density of 0.5 mA cm−2. After 500 cycles at 2 C, the assembled Li/PDOL@py0.125/LiFePO4 battery delivers 115 mAh/g and 90% capacity retention, with high average Coulombic efficiency of 99.83%. The present results demonstrate the heat suppression role of pyridine toward mixing DOL with 0.9M LiPF6 electrolyte, which solves the heat and viscosity problems for PDOL based gelling polymer electrolytes. © 2024, The Authors. All rights reserved.

关键词： Lithium compounds