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Giant reversible barocaloric effects with high thermal cycle stability in epoxybonded（MnCoGe）0.96（CuCoSn）0.04 composite

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International Journal of Minerals,Metallurgy and Materials 2024年第11期 2528-2534页

作者： Yafei Kuang Kun Tao Bo Yang Peng Tong Yan Zhang Zhigang Sun Kewei Zhang dunhui wang Jifan Hu Liang Zuo College of Materials Science and Engineering Taiyuan University of Science and Technology Shanxi Key Laboratory of Magnetic and Electric Functional Materials and Applications Taiyuan University of Science and Technology Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) School of Materials Science and Engineering Northeastern University School of Electronics and Information Hangzhou Dianzi University

Hexagonal MnMX-based （M=Co or Ni,X=Si or Ge） alloys exhibit giant reversible barocaloric ***,giant volume expansion would result in the as-cast MnMX ingots fragmenting into powders,and inevitably bring the deterioration of mechanical properties and *** fragmentation can bring degradation of structural transformation entropy change during cyclic application and removal of *** this paper,giant reversible barocaloric effects with high thermal cycle stability can be achieved in the epoxy bonded （MnCoGe）0.96（CuCoSn）*** reversible isothermal entropy change of 43.0 J·kg-1·K-1and adiabatic temperature change from barocaloric effects (?TBCE) of 15.6 K can be obtained within a wide temperature span of 30 K at 360 MPa,which is mainly attributed to the integration of the change in the transition temperature driven by pressure of-101 K·GPa-1and suitable thermal hysteresis of 11.1 ***,the variation of reversible ?TBCEagainst the applied hydrostatic pressure reaches up to 43 K·GPa-1,which is at the highest level among the other reported giant barocaloric *** importantly,after 60 thermal cycles,the composite does not break and the calorimetric curves coincide well,demonstrating good thermal cycle stability.

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社会融合视角下农民工城市定居意愿探赜——基于Logistic模型的实证研究

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安徽乡村振兴研究 2024年第3期3卷 9-17页

作者：王敦辉甘满堂福建农林大学金山学院福建福州350002 福州大学社会学系福建福州350002

农民工的城市定居意愿影响农民工市民化进程,进而影响我国新型城镇化建设与乡村振兴。文章基于2023年873份农民工问卷,在社会融合视角下,构建二元logistic回归模型对农民工的城市定居意愿影响因素进行研究。实证研究表明,只有58%的农民... 详细信息

农民工的城市定居意愿影响农民工市民化进程,进而影响我国新型城镇化建设与乡村振兴。文章基于2023年873份农民工问卷,在社会融合视角下,构建二元logistic回归模型对农民工的城市定居意愿影响因素进行研究。实证研究表明,只有58%的农民工具有城市定居意愿。农民工性别、年龄、婚姻状况、教育水平、家庭随迁人口数量、城市迁移时间长短等因素对定居意愿均没有显著影响;参加本地医保、身份认同、经济收入、健康状况、承包地等因素对农民工的城市定居意愿影响较大;社会参与度、闲暇生活、居住证等在一定程度上提升农民工的定居意愿。如何持续提升农民工的城市定居意愿,文章从社会关系融合、经济收入及公共服务均等化等三个方面提出了对策建议。

关键词：农民工社会融合视角城市定居意愿 logistic回归模型

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A Review on the Regulation of Magnetic Transitions and the Related Magnetocaloric Properties in Ni-Mn-Co-Sn Alloys

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Journal of Materials Science & Technology 2012年第3期28卷 193-199页

作者： Zhenchen Zhong Shengcan Ma dunhui wang Youwei Du School of Material Science and Engineering Nanchang Hangkong UniversityNanchang 330063China Department of Physics Nanjing UniversityNanjing 210093.China

In Ni-Mn-X（X=In,Sn,Sb） ferromagnetic shape memory alloys,a ferromagnetic transition from paramagnetic to ferromagnetic austenite and a martensitic transformation from ferromagnetic austenite to weak magnetic martensite occur in some particular composition ranges,in which abundant physical properties have been observed by the abrupt change of magnetization and resistivity around their transition temperatures in these ***,tuning the martensitic transformation temperature（TM） and enlarging the workingtemperature interval for Ni-Mn-X（X=In,Sn,Sb） alloys,are of great *** the present paper,we will focus on the effect of external factors,including pre-deformation,annealing,and high pressure annealing,on the magnetic transitions and the related magnetocaloric properties in Ni-Mn-Co-Sn ferromagnetic shape memory *** approaches and the main results in this particular field will be reviewed.

关键词： Martensitic transformation Magnetocaloric properties Pre-deformation Annealing High pressure annealing

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Electric-Field-Treated Ni/Co_(3)O_(4) Film as High-Performance Bifunctional Electrocatalysts for Efficient Overall Water Splitting

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Nano-Micro Letters 2022年第9期14卷 160-173页

作者： Junming Li Jun Li Jun Ren Hong Hong Dongxue Liu Lizhe Liu dunhui wang National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced MicrostructuresJiangsu Provincial Key Laboratory for NanotechnologySchool of PhysicsNanjing UniversityNanjing 210093People’s Republic of China Hangzhou Dianzi University Hangzhou 310018People’s Republic of China

Rational design of bifunctional electrocatalysts for oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)with excellent activity and stability is of great significance,since overall water splitting is a promising technology for sustainable conversion of clean ***,most electrocatalysts do not simultaneously possess optimal HER/OER activities and their electrical conductivities are intrinsically low,which limit the development of overall water *** this paper,a strategy of electric field treatment is proposed and applied to Ni/Co_(3)O_(4) film to develop a novel bifunctional *** treated by electric field,the conductive channels consisting of oxygen vacancies are formed in the Co_(3)O_(4) film,which remarkably reduces the resistance of the system by almost 2×10^(4) ***,the surface Ni metal electrode is partially oxidized to nickel oxide,which enhances the catalytic *** electric-field-treated Ni/Co_(3)O_(4) material exhibits super outstanding performance of HER,OER,and overall water splitting,and the catalytic activity is significantly superior to the state-of-the-art noble metal catalysts(Pt/C,RuO_(2),and RuO_(2)‖Pt/C couple).This work provides an effective and feasible method for the development of novel and efficient bifunctional electrocatalyst,which is also promising for wide use in the field of catalysis.

关键词： Bifunctional electrocatalyst Overall water splitting Co_(3)O_(4)film Oxygen vacancies Electric field

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Study of Magnetic Entropy Changes in Gd1-x Tx ( T = Ti, Cr, Fe and Cu) Alloys

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Journal of Rare Earths 2004年第z1期22卷 66-68页

作者： wang dunhui Huang Songling Han Zhida Zhang Jianrong Du Youwei National Laboratory of Solid State Microstructures Department of Physics Nanjing University Nanjing 210093 China

Magnetic refrigeration techniques based on the magnetocaloric effect (MCE) were demonstrated as a promising alternative to conventional vapour-cycle ***, scientists focused their research on room temperature magnetic *** rare earth Gd metal is regarded as a prototype for room temperature magnetic *** the various requirements in application, it is necessary to search for the magnetic refrigerant possessing qualities as good as Gd but having different Tc above or below room *** this article, we report the magnetic entropy changes in Gd1 -xTx(T = Ti, Cr, Fe and Cu) *** a small quantity of T atoms introduced in Gd, the Curie temperature *** values of magnetic entropy change in these alloys are almost the same as or a little less than that of *** the refrigerant capacities of these alloys are obviously larger than that of *** these facts suggest that Gd1-xTx(T = Ti, Cr, Fe and Cu) alloys may be good refrigerants for room temperature magnetic refrigeration.

关键词： magnetic entropy change rare earths

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Enhanced low-field magnetocaloric effect in Nb and Al co-substituted EuTiO_(3)compounds

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Journal of Materials Science & Technology 2022年第23期118卷 137-144页

作者： Huicai Xie Wenxia Su Haiming Lu Zhaojun Mo dunhui wang Hao Sun Lu tian Xinqiang Gao Zhenxing Li Jun Shen Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China National Laboratory of Solid State Microstructures Jiangsu Provincial Key Laboratory for NanotechnologySchool of PhysicsNanjing UniversityNanjing 210093China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

The magnetic ground state switching between antiferromagnetic(AFM)and ferromagnetic(FM)states in EuTiO_(3)provides the feasibility of regulating its magnetic properties and magnetocaloric ***-principles calculations demonstrate that the magnetic ground states for EuTi_(0.875)Nb_(0.0625)Al_(0.0625)O_(3),EuTi_(0.8125)Nb_(0.125)Al_(0.)0_(625)O_(3),and EuTi_(0.75)Nb_(0.125)Al_(0.125)O_(3)are FM *** results also exhibit the FM coupling domination in these compounds,accompanied by a significantly enhanced low magnetic field magnetocaloric *** maximum magnetic entropy change of all the samples surpasses15 J kg^(-1)K^(-1)with a field change of 1 *** is 1.4 times as large as that of bulk EuTiO_(3).Especially,the maximum refrigerating capacity for EuTi_(0.8125)Nb_(0.125)Al_(0.0625)O_(3)compound is evaluated to be 88.1 J kg^(-1),more than three times of that of EuTiO_(3).The remarkable magnetocaloric performances prove Nb and Al co-substituted EuTiO_(3)compounds to be competitive candidates for magnetic refrigeration in the liquid helium temperature regime.

关键词： Magnetocaloric effect Europium titanate(EuTiO_(3)) Ferromagnetic Magnetic refrigeration

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LARGE MAGNETIC ENTROPY CHANGE IN La0.67-xGdxCa0.33MnO3

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南京大学学报(自然科学) 1998年第4期 124-126页

作者： Huang He Guo Zaibing wang dunhui Du Youwei

Ｒｅｃｅｎｔｌｙ，ｍｏｒｅａｎｄｍｏｒｅｐｅｏｐｌｅｆｏｃｕｓｔｈｅｉｒａｔｅｎｔｉｏｎｏｎｔｈｅｍａｇｎｅｔｉｃｒｅｆｒｉｇｅｒａｔｉｏｎｂｅｃａｕｓｅｉｔｈａｓｌｏｔｓｏｆａｄｖａｎｔａｇｅｓｏｖｅｒｔｈｅｇａｓ... 详细信息

Ｒｅｃｅｎｔｌｙ，ｍｏｒｅａｎｄｍｏｒｅｐｅｏｐｌｅｆｏｃｕｓｔｈｅｉｒａｔｅｎｔｉｏｎｏｎｔｈｅｍａｇｎｅｔｉｃｒｅｆｒｉｇｅｒａｔｉｏｎｂｅｃａｕｓｅｉｔｈａｓｌｏｔｓｏｆａｄｖａｎｔａｇｅｓｏｖｅｒｔｈｅｇａｓｒｅｆｒｉｇｅｒａｔｉｏｎ．Ｉｎｔ...

关键词： refrigeration magnetic entropy perovskite

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Observation of magnetic domain evolution in constrained epitaxial Ni–Mn–Ga thin films on MgO(0 0 1) substrate

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Journal of Materials Science & Technology 2022年第7期102卷 56-65页

作者： Bo Yang Ivan Soldatov Fenghua Chen Yudong Zhang Zongbin Li Haile Yan Rudolf Schäfer dunhui wang Claude Esling Xiang Zhao Liang Zuo Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China Institute for Metallic Materials Leibniz Institute for Solid State and Materials Research(IFW)DresdenHelmholtzstrasse 2001069 DresdenGermany Institute of Natural Sciences Ural Federal University620002 EkaterinburgRussia Department of Physics School of Applied ScienceTaiyuan University of Science and TechnologyTaiyuan 030024China Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux(LEM3) CNRS UMR 7239Universitéde Lorraine57045 MetzFrance Institute for Materials Science Dresden University of Technology01062 DresdenGermany National Laboratory of Solid State Microstructures and Jiangsu Key Laboratory for Nanotechnology and Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Epitaxial Ni–Mn–Ga thin films have promising application potential in micro-electro-mechanical sensing and actuation systems. To date, large abrupt magnetization changes have been observed in some epitaxial Ni–Mn–Ga thin films, but their origin-either from magnetically induced martensite variant reorientation(MIR) or magnetic domain evolution-has been discussed controversially. In the present work, we investigated the evolutions of the magnetic domain and microstructure of a typical epitaxial Ni–Mn–Ga thin film through wide-field magneto-optical Kerr-microscopy. It is demonstrated that the abrupt magnetization changes in the hysteresis loops should be attributed to the magnetic domain evolution instead of the MIR.

关键词： Ni–Mn–Ga thin films Magnetic field-induced variant reorientation Magnetic domains Magnetization process Magneto-optical Kerr microscopy

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Electric field and photoelectrical effect bi-enhanced hydrogen evolution reaction

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Nano Research 2018年第6期11卷 3205-3212页

作者： Mengyu Yan Xunbiao Zhou Xuelei Pan dunhui wang Lixue Xia Kesong Yu Xiaobin Liao Xu Xu Liang He Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Materials Science and Engineering Department University of Washington Seattle Washington 98195-2120 USA

Molybdenum disulfide （MoS2） is an earth-abundant and low-cost hydrogen evolving electrocatalyst with the potential to replace traditional noble metal catalysts. The catalytic activity can be significantly enhanced after modification due to higher conductivity and enriched active sites. However, the underlying mechanism of the influence of the resistance of electrode material and contact resistance on the hydrogen evolution reaction （HER） process is unclear. Herein, we present a systematic study to understand the relationship between HER performance and electrode conductivity, which is bi-tuned through the electric field and photoelectrical effect. It was found that the onset overpotential consistently decreased with the increase of electrode conductivity. In addition, the reduction of the contact resistance resulted in a quicker electrochemical reaction process than enhancing the conductivity of the MoS2 nanosheet. An onset overpotential of 89 mV was achieved under 60 mW/cm^2 sunlight illumination （0.6 sun） and a simultaneous gate voltage of 3 V. These physical strategies can also be applied to other catalysts, and offer new directions to improve HER catalytic performance of semiconductor materials.

关键词： electrochemical device hydrogen evolution reaction photoelectrical effect field effect

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Combining magnetocaloric and elastocaloric effects in a Ni45Co5Mn37In13 alloy

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Journal of Materials Science & Technology 2021年第35期94卷 47-52页

作者： Pengtao Cheng Zhenjia Zhou Jiaxing Chen Zongbin Li Bo Yang Kun Xu Zhe Li Jun Li Zhengming Zhang dunhui wang Suxin Qian Youwei Du National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing 210093China Jiangsu Provincial Key Laboratory for Nanotechnology Nanjing UniversityNanjing 210093China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China Center for Magnetic Materials and Devices Key Laboratory for Advanced Functional and Low Dimensional Materials of Yunnan Higher Education Institute Qujing Normal UniversityQujing 655011China School of Electronics and Information Hangzhou Dianzi UniversityHangzhou 310018China Department of Refrigeration and Cryogenic Engineering Xi'an Jiaotong UniversityXi'an 710049China

*** Refrigeration plays an essential role in nowadays ***,conventional refrigeration based on vapor compression cooling shows high energy consumption,complicated structure and even environmental *** for an environmentalfriendly and energy-saving refrigeration technology has become a matter of concern[1,2].In the past few decades,the solid-state refrigeration technologies mainly represented by magnetocaloric effect(MCE),electrocaloric effect(ECE)and elastocaloric effect(e CE)have been regarded as promising candidate to replace traditional vapor compression refrigeration technology owing to environmental friendliness and high efficiency[1-9].

关键词： alloy effect replace

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