检索结果-内蒙古大学图书馆

Charge and spin instabilities in superconducting La3Ni2O7

Physical Review B 2025年第1期111卷 014515-014515页

作者： Xuejiao Chen Peiheng Jiang Jie Li Zhicheng Zhong Yi Lu National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093 China Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China School of Photoelectric Engineering Changzhou Institute of Technology Changzhou Jiangsu 213002 China School of Physics MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Xi'an Jiaotong University Xi'an 710049 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

Motivated by the recent discovery of superconductivity in La3Ni2O7 under high pressure, we explore its potential charge and spin instabilities through combined model analysis and first-principles calculations. Taking into account the small charge-transfer nature of high valence nickel, a fully correlated two-cluster model identifies a lattice-coupled charge instability characterized by substantial short-range fluctuations of oxygen holes. This periodicity-two instability is corroborated by density functional theory plus U calculations that also reveal a strong tendency towards concurrent antiferromagnetic ordering. The charge, spin, and associated lattice instabilities are significantly suppressed with increasing external pressure, contributing to the emergence of superconductivity in pressurized La3Ni2O7. Carrier doping and chemical substitution at the La site is found to effectively suppress these instabilities, suggesting a viable strategy to stabilize a superconducting phase under ambient pressure.

关键词： Charge transfer

来源：评论

学校读者我要写书评

暂无评论

Organic–inorganic S-scheme heterojunction photocatalysts: Design, synthesis, applications, and challenges

引用

eScience 2025年第3期5卷

作者： Cheng, Jingzhao Cheng, Bei Xu, Jingsan Yu, Jiaguo Cao, Shaowen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Hubei Technology Innovation Center for Advanced Composites Wuhan University of Technology Wuhan 430070 China School of Chemistry and Physics Queensland University of Technology Brisbane QLD Australia Laboratory of Solar Fuel Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 430078 China

Since the concept was introduced in 2019, step-scheme (S-scheme) heterojunctions have emerged as an important subclass of heterojunction technology and attracted much attention for solar energy conversion. S-scheme heterojunctions are capable of maximizing redox ability through conferring enhanced photocatalytic performance by addressing the problem of rapid electron–hole recombination. In particular, the organic–inorganic S-scheme heterojunction (OI-SHJ) can integrate atomic long-range ordered inorganic semiconductors with tailored organic materials using diverse organic molecular building blocks and integration methods, offering brilliant prospects for innovation. Here, we review the state-of-the-art progress in OI-SHJ photocatalysts by introducing their charge transfer mechanism, design criteria, preparation approaches, and applications. We also highlight the synergistic role of organic and inorganic materials in S-scheme heterojunctions and what is understood so far about their structure–activity relationship. We conclude by summarizing the existing challenges and emphasizing the current outlook for the future development of OI-SHJ photocatalysts. © 2024 The Authors

关键词： Energy conversion Organic–inorganic Photocatalysis S-scheme

来源：评论

学校读者我要写书评

暂无评论

Regulating energy-absorption mechanism of sandwich construction through encasing high-strength fabric outside foam core

引用

Thin-Walled Structures 2025年 214卷

作者： Ren, Jianwei Zhao, Zhenyu Meng, Han Zhang, Daqiao Wu, Jian Li, Bangjie Zhang, Rui Xi'an Research Institute of High Technology Xi'an710025 China MIIT Key Laboratory of Multifunctional Lightweight Materials and Structures Nanjing University of Aeronautics and Astronautics Nanjing210016 China State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and Astronautics Nanjing210016 China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China

Encasing high-strength composite fabric outside foam core has been proposed to enhance the impact resistance of the overall sandwich structure. Built upon the experimental findings, the dynamic response of sandwich containing an encased foam core, through UHMWPE here, was investigated numerically. First, employing a validation FE calculation, both the physical behavior and energy-absorption mechanism of encasing effect induced by high-strength fabric upon the dynamic response of sandwich construction were explored. Then, the effect of material properties of fabric and foam, as well the boundary condition were discussed from the perspective of structural energy absorption. The presence of fabric alters the strain and stress spatial distribution of the foam core component, thus affecting the energy absorption ratio of each component and leading to an increased 24 % energy absorption for the entire construction. Fabric encasement outside the foam core improves the impact resistance of the loaded target through two aspects: (1) diminishing crack initiation within the foam core, (2) intensifying the energy absorption of the facesheet component by nearly three times. Also, the boundary condition plays an essential role in such an improvement approach, through varying the initiation of structural damage at the loaded target. This research provides a new insight into the design of protective components against blasting scenarios. © 2025

关键词： Sandwich structures

来源：评论

学校读者我要写书评

暂无评论

Argon-assisted electrical explosion of graphite powder in a constraint tube: Experimental and MD insights into the exfoliation mechanism

引用

Ceramics International 2025年

作者： Zhu, Wenli Zhu, Liang Department of Civil and Environmental Engineering University of California Los Angeles United States School of Materials Science and Engineering State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou730050 China

We report a top-down electrical explosion approach in a constraint tube under an argon atmosphere for high-yield production of few-to multi-layer graphene. By coupling high-voltage discharges with inert gas support, this technique imparts intense shock loading that surmounts the interlayer van der Waals forces in graphite. Systematic experimental analyses (FE-SEM, TEM/HRTEM, AFM, Raman) confirm efficient exfoliation into largely few-layer graphene with minimal defects and residual graphite. To elucidate the atomistic mechanisms, large-scale molecular dynamics (MD) simulations replicate key stages of the process—annealing, shock-induced delamination, and cooling—revealing how shock loading and argon interactions drive interlayer expansion, bending, and partial delamination. Notably, argon significantly mitigates re-agglomeration during the cooling stage, preserving dispersed graphene flakes. This synergy between experiment and simulation establishes electrical explosion in an argon-rich environment as a scalable method potentially suitable for commercial graphene production. Moreover, it highlights the crucial role of controlled shock conditions and argon gas interactions in enabling robust, few-layer exfoliation, paving the way for further optimization and industrial implementation. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Van der Waals forces

来源：评论

学校读者我要写书评

暂无评论

Towards state-of-the-art semiconductor/dielectric interface in two-dimensional electronics

引用

Journal of materials Science & technology 2025年 239卷 93-108页

作者： Yongshan Xu Kailang Liu Xiong Xiong Yanqing Wu Tianyou Zhai State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China School of Integrated Circuits and Beijing Advanced Innovation Center for Integrated Circuits Peking University Beijing 100871 China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen 518057 China

Two-dimensional (2D) semiconductors have emerged as an ideal platform for fundamental research and a promising candidate beyond silicon materials in future transistors due to their ultrathin thickness and excellent electrical properties. However, the practical application of 2D semiconductors still faces significant challenges. The excellent interface quality of traditional silicon-based semiconductor devices is crucial for their outstanding performance, whereas the interface issues in 2D semiconductor/dielectric systems remain unresolved, resulting in device performance far below expectations. Therefore, further study of the interface in 2D semiconductor/dielectric systems and finding appropriate methods to quantify interface quality, as well as interface optimization strategies, are critical for driving the practical application of 2D semiconductors. In this review, we discuss the issues existing at the 2D semiconductor/dielectric interface, quantitative characterization methods and optimization strategies for interface quality. This includes comparing the advantages and disadvantages of traditional characterization methods for silicon-based semiconductors when applied to 2D semiconductors, as well as the development of strategies to improve interface quality and enhance the performance of 2D devices. Finally, in the outlook, we outline the development directions for improving the interface quality of 2D semiconductor/dielectric systems.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Rational design of embedding dispersed Mo2C in nitrogen-doped carbon layer for Si-based anodes enable stable and superior lithium storage performance

引用

materials Today Energy 2025年 51卷

作者： Zhang, Siyi Zhang, Zhihua Zhu, Jing Wang, Haonan Qin, Yanmin Hu, Sijiang Xie, Guiting Wang, Hongqiang Li, Qingyu Pan, Qichang Guangxi Key Laboratory of Low Carbon Energy Materials Guangxi Scientific and Technological Achievements Transformation Pilot Research Base of Electrochemical Energy Materials and Devices School of Chemistry and Pharmaceutical Sciences Guangxi Normal University Guilin541004 China State Key Laboratory of New Textile Materials and Advanced Processing Technology School of Materials Science and Engineering Wuhan Textile University Wuhan430200 China

Structure deterioration and slow reaction kinetics are the big challenges to hinder the practical application of silicon-based anodes in lithium-ion batteries (LIBs). Herein, have unique properties of Mo2C was introduced to simultaneously improve the structural stability and reaction kinetics during lithiation/delithiation process, achieving high rate capability and long-term cycling performance of Si-based anodes. Specifically, the Mo2C have highly conductive ionic carriers which can accelerate lithium ions transportation for enhancing reaction kinetics. Moreover, the high mechanical strength Mo2C embedded in the N-doped carbon layer can further improve the mechanical flexibility of the intact encapsulated Si nanoparticles, as well as buffers the huge volume change of the silicon core during lithiation/delithiation process, then maintained the structural integrity of the electrodes during the cycling process. Accordingly, the designed Si@Mo2C/NC composite exhibit outstanding lithium storage performance, including outstanding cycling stability (1032 mA h g−1 was obtained after 600 cycles at 1.0 A g−1) and rate capability (574.5 mA h g−1 can be maintained even at 5.0 A g−1). Meanwhile, the assembled Si@Mo2C/NC||LiFePO4 full cells displays superior cycling performance, and a high capacity of 103.3 mA h g−1 was maintained after 500 cycles at 3 C. © 2025 Elsevier Ltd

关键词： Silicon carbide

来源：评论

学校读者我要写书评

暂无评论

Large Tunneling Magnetoresistance in Nonvolatile 2D Hybrid Spin Filters

引用

Physical Review Letters 2025年第7期134卷 077001-077001页

作者： Xiaoyu Wang Lihao Zhang Miao He Qi Li Wenqin Song Kunlin Yang Shuxi Wang Takashi Taniguchi Kenji Watanabe MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Materials and Mesoscopic Physics School of Physics Xi’an Jiaotong University Xi’an 710049 China Anhui Key Laboratory of Low-Energy Quantum Materials and Devices High Magnetic Field Laboratory Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei 230031 China Science Island Branch of Graduate School University of Science and Technology of China Hefei 230026 China Key Laboratory of Flexible Electronics and Institute of Advanced Materials Nanjing Tech University Nanjing 211816 China State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai 200433 China Research Center for Materials Nanoarchitectonics National Institute for Materials Science Tsukuba 305-0044 Japan Research Center for Electronic and Optical Materials National Institute for Materials Science Tsukuba 305-0044 Japan

Ferromagnetic semiconductors offer an efficient way to achieve high spin polarization via spin filtering effect. Large tunneling magnetoresistance (TMR) can then be realized when multiple spin filters are put in series, as recently demonstrated in van der Waals 2D A-type antiferromagnets such as CrI3 and CrSBr. However, the interlayer antiferromagnetic ground state of these magnets inherently results in a high resistance state at zero field, and this volatile behavior limits potential applications. Here we fabricate hybrid spin filters using 2D ferromagnetic metal Fe3GeTe2 and semiconductor CrBr3, which are nonvolatile as two magnets are magnetically decoupled. We achieve large TMR of around 100%, with its temperature dependence well fitted by the extended Jullière model. Additionally, the devices allow spin injection tuned through bias voltage, and TMR polarity reversals are observed. Our work opens a new route to develop 2D magnetic semiconductor based spintronics.

关键词： Van der Waals forces

来源：评论

学校读者我要写书评

暂无评论

Crystal Structures and Thermoelectric Properties of Sm-Filled Skutterudite Compounds Sm_yFe_xCo_(4-x)Sb_(12)

引用

Journal of Rare Earths 2007年第6期25卷 739-743页

作者：刘桃香唐新峰谢文杰鄢永高张清杰 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Polycrystalline samples of Sm partially filled skutterudites SmyFexCo4-xSb12 were prepared by melting and Spark Plasma Sintering technique. The results of Rietveld refinement showed that the obtained SmyFexCo4-xSb12 samples possessed filled skutterudite structures. The thermal parameter （B） of Sm is larger than that of Sb, Fe, and Co, indicating that Sm ＂rattled＂ in Sb-icosahedron voids. The effects of filling atom Sm on thermoelectric properties of these compounds were investigated. With the increase of Sm filling fraction （y）, electrical conductivity decreased, Seebeck coefficient increased and had a maximum value when y was 0.38; thermal conductivity reduced and had a minimum value when y was 0. 32. At 750 K, the highest figure of merit of 0.68 was obtained for Sm0.32Fe1.47Co2.53Sb12.

关键词： skutterudite compound thermoelectric properties Sm filling rare earths

来源：评论

学校读者我要写书评

暂无评论

Rare earth metal oxides as BH_4^--tolerance cathode electrocatalysts for direct borohydride fuel cells

引用

Journal of Rare Earths 2012年第5期30卷 437-441页

作者：倪学敏王雅东郭峰姚佩潘牧 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Rare earth metal oxides（REMO） as cathode electrocatalysts in direct borohydride fuel cell（DBFC） were *** REMO electrocatalysts tested showed favorable activity to the oxygen electro-reduction reaction and strong tolerance to the attack of BH 4-in alkaline *** simple membraneless DBFCs using REMO as cathode electrocatalyst and using hydrogen storage alloy as anodic electrocatalyst exhibited an open circuit of about 1 V and peak power of above 60 mW/cm *** DBFC using Sm 2 O 3 as cathode electrocatalyst showed a relatively better *** maximal power density of 76.2 mW/cm 2 was obtained at the cell voltage of 0.52 V.

关键词： direct borohydride fuel cell oxygen electro-reduction rare earth oxide membraneless DBFC

来源：评论

学校读者我要写书评

暂无评论

Damage induced bending strength variation and crack initiation mechanism during thermal cycling shock of laser deposited Stellite alloy coating for engine valve

引用

Journal of materials Research and technology 2025年 36卷 6062-6074页

作者： Wei Li Rui Cao Feng Zhu Yingjie Yan Jinyuan Ma Yanli Zhu State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal Lanzhou University of Technology Lanzhou 730050 China Department of Materials Science and Engineering Lanzhou University of Technology Lanzhou 730050 China Department of Engineering University of Leicester LE1 7RH UK National Key Laboratory of Marine Engine Science and Technology Shanghai 201108 China

Stellite alloy coatings can significantly enhance the wear resistance of valves; however, cyclic thermal loading can induce thermal cycling shock, thereby reducing their service life and overall performance. This study systematically investigates the mechanisms of damage evolution, variations in bending properties, and crack initiation under thermal shocks in laser-deposited Stellite alloy coatings through quenching experiments coupled with multiscale characterization and numerical simulations. The results indicate that the critical temperature of macroscopic cracking is in the range from 350 °C to 400 °C. The damage, such as slip bands, micropores, and microcracks, is primarily induced by thermal stress concentrations driven by rapid cooling. The bending strength of the coatings deteriorates with an increasing damage fraction, which is attributed to the increase of the stress concentration factor in the damage area. Higher peak temperatures produce higher thermal stress, accelerating crack initiation and rapid propagation along the interfaces between the eutectic carbides and the matrix above the critical temperature. Conversely, at lower peak thermal shocking temperatures, the high density of geometrically necessary dislocations (from 74.786 × 10 12 to 178.269 × 10 12 /m 2 ) leads to significant localized stress concentrations, which synergistically with the interfacial damage degradation promote crack initiation.

关键词： Stellite alloy coating Thermal cycling shock Damage Bending strength Crack initiation

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：