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Magnetism control with enhanced hard magnetic temperature in heterostructures based on the van der Waals magnet Fe5GeTe2

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Physical Review B 2023年第9期108卷 094408-094408页

作者： Chunsheng Wang Kejia Zhu Yupeng Ma Longyu Lu Tao Hu Liang Li Xucai Kan Yimin Xiong Yingying Zhang Guopeng Wang Zhengcao Li Mingliang Tian School of Physics and Optoelectronics Engineering Anhui University Hefei 230601 China School of Materials Science and Engineering Anhui University Hefei 230601 China Key Laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and Nanotechnology Institute of Solid State Physics Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei 230031 China Hefei National Laboratory Hefei 230028 China State Key Laboratory for New Ceramics and Fine Processing Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and Engineering Tsinghua University Beijing 100084 China

The discovery of two-dimensional magnets with intrinsic ferromagnetic or antiferromagnetic orders has opened up promising prospects for exploring magnetism at the desired thickness, paving the way for novel spintronic applications. In practice, the manipulation of the magnetic state in van der Waals ferromagnets is highly demanding but remains a significant challenge. In this work, we demonstrate that the magnetic states of the Fe5GeTe2 (FGT)-based heterostructures can be substantially tuned through a natural oxidation process. During this process, the exchange bias effect is observed in the naturally oxidized FGT flakes, confirming the existence of exchange coupling between the ferromagnetic FGT layer and antiferromagnetic oxide layer. Through the exchange coupling, the formed oxide layer affects the magnetic ordering of the Fe1 sites and magnetic anisotropy, which is evidenced by the increment of hard magnetic temperature. Theoretical calculations shed light on the crucial role of the oxide layer in the magnetic state transitions. These results provide valuable insights into the understanding and manipulation of the emergent magnetic states, leading to significant advances in the realization of practical two-dimensional spintronics.

关键词： Hall effect Magnetic coupling Magnetic interactions Magnetic phase transitions

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Interfacial molecular anchor for ambient all-bladed perovskite solar modules

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Joule 2025年第5期9卷

作者： Zhu, Xuejie Yu, Dongqi Zhou, Xin Wang, Nan Liu, Hong Liang, Zihui Wu, Congcong Wang, Kai Jin, Dayong Liu, Shengzhong Yang, Dong State Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Dalian116023 China School of Physics and Electronic Technology Liaoning Normal University Dalian116029 China Interdisciplinary Research Center for Biology and Chemistry Liaoning Normal University Liaoning Dalian116029 China Key Laboratory for the Green Preparation and Application of Functional Materials Hubei Key Laboratory of Polymer Materials School of Materials Science and Engineering Hubei University Wuhan430062 China National Local Joint Laboratory for Advanced Textile Processing and Clean Production Wuhan Textile University Wuhan430073 China Huanjiang Laboratory Zhejiang University Zhuji311800 China School of Mathematical and Physical Sciences Faculty of Science University of Technology Sydney SydneyNSW Australia Eastern Institute for Advanced Study Eastern Institute of Technology Ningbo China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

Ambient blade coating of perovskite solar modules shows great potential for large-scale manufacture and commercialization. However, blade coating nanometer-thick buffer layers typically results in a nonuniform surface due to particle instability and aggregation, often leading to insufficient integration and destabilization of the crystallographic lattice in the overlying perovskite layer. Herein, we introduce a layer of "molecular glue" that can effectively anchor the solute that suspends the monodisperse SnO2 nanoparticles into a uniform thin film and adhere it to the top perovskite during the mechanical blading process. Leveraging this holistic nanoparticle-anchoring strategy, we have achieved a seamlessly bonded cathode heterojunction, resulting in a record efficiency of 26.11% for small cells and the highest efficiency so far of 22.76% (certified at 21.60%) for mini-modules. Importantly, these ambiently all-blade-coated devices exhibit an extended lifetime of approximately 1,500 h, as verified by ISOS-O testing, indicating great promise for commercialization. © 2025

关键词： Perovskite

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Properties and precipitates of the high strength and electrical conductivity Cu-Ni-Co-Si-Cr alloy

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Journal of materials Science & technology 2021年第34期93卷 1-6页

作者： Yijie Ban Yongfeng Geng Jinrui Hou Yi Zhang Meng Zhou Yanlin Jia Baohong Tiana Yong Liua Xu Li Alex A.Volinsky School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology Luoyang 471023China Henan Key Laboratory of Nonferrous Materials Science and Processing Technology Luoyang 471023China School of Materials Science and Engineering Central South UniversityChangsha 410083China Center for Advanced Measurement Science National Institute of MetrologyBeijing 100029China epartment of Mechanical Engineering University of South Florida4202 E.Fowler Ave.ENG030Tampa 33620United States

In this paper,a novel Cu-1.5 Ni-1.1 Co-0.6 Si-0.1 Cr(wt.%)alloy with high strength and electrical conductivity was *** aging,excellent properties of 857±12 MPa yield strength,300±8 HV microhardness,42.8±2.5%IACS conductivity,and 7±0.5%elongation were *** to the atomic structure,part of Ni atoms in Ni_(2)Si can be replaced by Co atoms to form nano-precipitates(Ni,Co)_(2)*** alloy’s high strength and conductivity are mainly attributed to the fine and uniformly distributed(Ni,Co)_(2)Si and Cr nano *** alloy strength was also enhanced by twins,dislocations,and grain refining *** on the investigations of deformation microstructure and the orientation relationship between the(Ni,Co)_(2)Si precipitates and the Cu matrix,the main reason for elongation increase is attributed to the formation of deformation twins and the small lattice mismatch strain at the coherent interfaces of precipitates and the Cu matrix.

关键词： Copper Mechanical properties Precipitates Deformation twins

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A P/N/Si-Containing Hyperbranched Polymer for High-Performance and Multifunctional One-Component Epoxy Resins

SSRN

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SSRN 2024年

作者： Chai, Mingzhuo Liu, Hailong Wu, Yiqi Xue, Kangle Zhang, Pengbo Liu, Li Huang, Yudong MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin150001 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China

High-performance and multifunctional one-component epoxy resins (OCEPs) featuring high mechanical properties, high fire safety, long shelf life, low dielectric properties and satisfactory transparency are eagerly awaited in advanced manufacturing. However, it is tough but rewarding to fulfill these performances concurrently. Herein, a hyperbranched polymer containing P/N/Si (Si-DP) was fabricated for the multifunctional modification to EP10, the OCEP composed of a latent curing agent. EP10 containing Si-DP (EP10/Si-DP) boasts a shelf life longer than 81 d. Si-DP dramatically enhances the flame retardancy of EP10, with EP10/Si-DP5 achieving a UL-94 V-0 classification and a limiting oxygen index (LOI) of 34.3%. EP10/Si-DP offers lower dielectric constant, dielectric loss, excellent transparency and mechanical properties. Especially, EP10/Si-DP5 demonstrates 74.0%, 60.7% and 261.1% higher tensile, flexural and impact strengths than EP10. Moreover, the carbon fiber epoxy composites prepared from EP10/Si-DP5 display remarkable improvement in flame retardancy, smoke suppression, mechanical and interfacial performances. Altogether, this research proposes an effective approach for producing high-performance and multifunctional OCEPs with long shelf life. © 2024, The Authors. All rights reserved.

关键词： Dielectric losses

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Multiscale Study on Irradiation Effect of A508-Ⅲ Steel by Experimental Observation and Numerical Simulation

SSRN

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SSRN 2024年

作者： Lin, Pan-Dong Nie, Jun-Feng Cui, Wen-Dong He, Lei Cui, Shu-Gang Xiang, Li-Xin Lu, Yu-Peng Xiao, Gui-Yong Ministry of Education Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials School of Materials Science and Engineering Shandong University Jinan250061 China Institute of Nuclear and New Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University Beijing100084 China

Irradiation can induce microscopic defects in reactor pressure vessel (RPV) steel, resulting in macroscopic hardening and embrittlement. In this study, a micro-meso-macroscale calculation framework for the mechanical properties of irradiated RPV steel is proposed based on both experimental observation and numerical *** mean size and number density of Fe-ion-irradiation-induced dislocation loops were measured using transmission electron microscopy (TEM), which were described using a power-function relationship with the irradiation dose at various temperatures and utilized as input parameters for the crystal plasticity finite element model (CPFEM) which is incorporated with MD-derived formula and nano-indentation tests of A508-III steel under different irradiation conditions were successfully simulated. In addition, microstructural characterization and simulation of molecular dynamics (MD) showed the phenomenon of dislocation pinning and the sweeping of irradiation defects during dislocation migration, implying that the dislocation-loop interactions could be responsible for the formation of dislocation channels and curved dislocation lines. Furthermore, irradiation-induced increased in yield stress and ductile-brittle transition temperature (DBTT) at various temperatures were investigated. Results showed that the yield stress, DBTT, and degree of irradiation hardening and embrittlement increased with the irradiation dose and decreased with irradiation temperature. Finally, the adjusted reference temperature (ART), a significant design parameter for nuclear reactors, was calculated and evaluated based on the multiscale framework, which can provide reference information for nuclear reactor life extension. © 2024, The Authors. All rights reserved.

关键词： Ion bombardment

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Construction of Sunlight-resistant Color and Process Control of Meta-aramid Fiber

Construction of Sunlight-resistant Color and Process Control...

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作者： Hong-Hui Xia Xin Chen Dan Sheng Yun-Li Wang Rui-Qing Li Gen-Yang Cao State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University School of Textile and Clothing Jiangnan University

To increase the color fastness to sunlight of dyed meta-aramid,meta-aramid fabrics are dyed with vat dyes with excellent color fastness to *** was achieved through conducting the suspension dyeing method and the leuco-acids dyeing *** effects of dye concentration,thiourea dioxide concentration,reduction temperature,dyeing temperature and dyeing time on dyeing performance were *** dyeing process is as follows:vat dye 60 g/L,thiourea dioxide 5 g/L,reduction was carried out at 60°C,followed by dyeing at 130°C for 60 *** results show that vat dyeing can deal with the issue of poor color fastness to sunlight of meta-aramid fiber,and leuco-acid dyeing with vat dyes can improve meta-aramid fiber color fastness to sunlight,up to 3-4.

关键词： Vat Dyes Meta-aramid Suspensions Leuco-acids Color Fastness to Sunlight

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Effects of strain rates on dynamic deformation behavior of Cu-20Ag alloy

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Journal of materials Science & technology 2021年第20期79卷 75-87页

作者： Kexing Song Yongfeng Geng Yijie Ban Yi Zhang Zhou Li Xujun Mi Jun Cao Yanjun Zhou Xuebin Zhang School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang471023China Provincial and Ministerial Co-Construction of Collaborative Innovation Center for Non-Ferrous Metal New Materials and Advanced Processing Technology Henan ProvinceLuoyang471023China Henan Province Key Laboratory of Nonferrous Materials Science and Processing Technology Luoyang471023China School of Materials Science and Engineering Central South UniversityChangsha410083China General Research Institute for Nonferrous Metals Beijing100088China Henan Polytechnic University Henan ProvinceJiaozuo454010China

Copper alloy is widely used in high-speed railway,aerospace and other fields due to its excellent electrical conductivity and mechanical *** speed deformation and dynamic loading under impact load is a complex service condition,which widely exists in the field of national defense,military and industrial ***,the dynamic deformation behavior of the Cu-20Ag alloy was investigated by Split Hopkinson Pressure Bar(SHPB)with the strain rates of 1000-25000 s^(-1),high-speed hydraulic servo material testing machine with the strain rates of 1-500 s^(-1).The effect of strain rate on flow stress and adiabatic shear sensitivity was *** results show that the increase of strain rate will increase the flow stress and critical strain,that is to say,the increase of strain rate will reduce the adiabatic shear sensitivity of the Cu-20Ag *** Cu-Ag interface has obvious orientation relationship with;(111)_(Cu)//(111)_(Ag):(^(-)111)_(Cu)//(^(-)111)_(Ag):(^(-)200)_(Cu)//(^(-)200)_(Ag) and [0^(-)11]_(Cu)//[0^(-)11]_(Ag) with the increase of strain *** increase of strain rate promotes the precipitation of Ag and increases the number of interfaces in the microstructure,which hinders the movement of dislocations and improves the stress and yield strength of the Cu-20Ag *** concentration and distribution density of dislocations and the precipitation of Ag were the main reasons improve the flow stress and yield strength of the Cu-20Ag alloy.

关键词： Cu-20Ag alloy Dynamic deformation Split Hopkinson Pressure Bar Adiabatic shear sensitivity

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Multiscale Study on Irradiation Effect of A508-Ⅲ Steel by Experimental Observation and Numerical Simulation

SSRN

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SSRN 2024年

作者： Lin, Pan-Dong Nie, Jun-Feng Cui, Wen-Dong He, Lei Cui, Shu-Gang Xiang, Li-Xin Lu, Yu-Peng Ministry of Education Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials School of Materials Science and Engineering Shandong University Jinan250061 China Institute of Nuclear and New Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety Ministry of Education Tsinghua University Beijing100084 China

Irradiation can induce microscopic defects in reactor pressure vessel (RPV) steel, resulting in macroscopic hardening and embrittlement. In this work, a micro-meso-macroscale calculation framework for the mechanical properties of irradiated RPV steel is proposed based on both experimental observation and numerical simulation. The mean size and number density of Fe-ion-irradiation-induced dislocation loops were measured using transmission electron microscopy (TEM), which were described using a power-function relationship with the irradiation dose at various temperatures and used as input parameters for the crystal plasticity finite element model (CPFEM). Nano-indentation tests of A508-Ⅲ steel under different irradiation conditions were successfully simulated. In addition, microstructural characterization and simulation of molecular dynamics (MD) showed the phenomenon of dislocation pinning and the sweeping of irradiation defects during dislocation migration, implying that the dislocation-loop interactions could be responsible for the formation of dislocation channels and curved dislocation lines. Furthermore, irradiation-induced increases in yield stress and brittle-ductile transition temperature (BDTT) at various temperatures were investigated. Results showed that the yield stress, BDTT, and degree of irradiation hardening and embrittlement increased with the irradiation dose and decreased with irradiation temperature. Finally, the adjusted reference temperature (ART), a significant design parameter for nuclear reactors, was calculated and evaluated based on the multiscale framework, which can provide reference information for nuclear reactor life extension. © 2024, The Authors. All rights reserved.

关键词： Ion bombardment

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Microwave-assisted synthesis of Cr_(3)C_(2)@C core shell structure anchored on hierarchical porous carbon foam for enhanced polysulfide adsorption in Li-S batteries

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Nano Research 2021年第7期14卷 2345-2352页

作者： Xierong Zeng Jianxin Tu Shuangshuang Chen Shaozhong Zeng Qi Zhang Jizhao Zou Kezhi Li Shenzhen Key Laboratory of Special Functional Materials&Shenzhen Engineering Laboratory for Advance Technology of ceramics College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China State Key Laboratory of Solidification Processing Carbon/Carbon Composites Research CenterNorthwestern Polytechnical UniversityXi’an 710072China School of Materials Science and Engineering Anhui University of TechnologyMa'anshan 243002China College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118China BCMaterials Basque Center for MaterialsApplications and NanostructuresUPV/EHU Science Park48940 LeioaSpainIKERBASQUEBasque Foundation for Science48013 BilbaoSpain

In this paper,we use microwave reduction strategy to synthesize a new bi-functional sulfur host material at the service of cathode substrate for lithium-sulfur batteries(LSBs),the composite is made of hierarchical porous carbon foam supported carbon-encapsulated chromium carbide nano-particles(Cr_(3)C_(2)@C/HPCF),in which the well-distributed conductive Cr_(3)C_(2) nano-particles can act as powerful chemical adsorbent and are effective in restraining the shuttle effect of lithium polysulfides(LiPSs).Test results show that the Cr_(3)C_(2)@C/HPCF based sulfur electrodes with 75 wt.%of sulfur exhibit a high initial discharging capacity of 1,321.1 mAh·g^(−1) at 0.1 C(3.5 mg·cm^(−2)),and a reversible capacity can still maintain stability at 1,002.1 mAh·g^(−1) after 150 *** increasing the areal sulfur loading to 4 mg·cm^(−2),the electrodes can still deliver an initial discharging capacity of 948.0 mAh·g^(−1) at 0.5 C with ultra-slow capacity decay rate of 0.075%per cycle during 500 ***,the adsorption energy between the Cr_(3)C_(2) surface and LiPSs as well as theoretic analysis based on first-principles is also investigated.

关键词： Cr_(3)C_(2)nanoparticles core shell structure chemisorptions microwave reduction hierarchical porous carbon foam Li-S batteries

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Facilitating alkaline hydrogen evolution of Ru@Fe-NC with ultra-low overpotential: Optimized d-band center and lowered energy barrier for water dissociation

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Journal of Energy Chemistry 2025年 109卷 347-356页

作者： Xiaona Zhang Zeyang Liu Wenxuan Guo Wei An Zhaoyi Song Yizhang Du Tongjun Shen Qihao Qin Chunxia Wang Guoyong Huang Shengming Xu Junjie Mao State Key Laboratory of Heavy Oil Processing College of New Energy and Materials China University of Petroleum (Beijing) Beijing 102249 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 10084 China Beijing Key Lab of Fine Ceramics Tsinghua University Beijing 100084 China Key Laboratory of Functional Molecular Solids Ministry of Education College of Chemistry and Materials Science Anhui Normal University Wuhu 241000 Anhui China

The strong hydrogen binding affinity on Ru surfaces and their intrinsic aggregation tendency pose significant challenges to the hydrogen evolution reaction (HER) activity of Ru-based electrocatalysts. The construction of active electrocatalysts composed of partially dispersed nanoparticles (NPs) and individual single atomic site with robust thermodynamic stability, has emerged as a viable alternative to benchmark commercial HER electrocatalyst. Herein, a multi-step strategy was designed to synthesize Ru NP @Fe SA -NC electrocatalyst, and a robust interaction between uniformly dispersed Ru NPs and embedded single-atom Fe sites was uncovered, which not only regulates the particle size of Ru NPs but also controls the spin state and electronic configuration of Fe single atom. Moreover, magnetic characterization reveals that the synergetic effect induces a high spin state of the Fe atom with unpaired electrons in the 3 d orbitals, which enhances the adsorption of intermediates and accelerates the reaction kinetics. The as obtained electrocatalyst demonstrates a low overpotential of 13 mV at 10 mA cm −2 in alkaline condition. Remarkably, theoretical calculation indicates that the outstanding performance of Ru NP @Fe SA -NC stems from the Fe optimized electronic structure of the Ru site, which downshifts the d-band center, reduces the energy barriers for water dissociation and optimizes H* desorption, thereby promoting HER. This study presents an innovative approach to utilize Fe SA -NC to stabilize Ru NPs and reduce the energy barrier, contributing to an ideal HER performance.

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