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Phase transition regulation and caloric effect

能源前沿:英文版 2023年第4期17卷 463-477页

作者： Yuan LIN Jiazheng HAO Kaiming QIAO Yihong GAO Fengxia HU Jing WANG Tongyun ZHAO Baogen SHEN Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing100190China School of Physical sciences University of Chinese Academy of SciencesBeijing101408China spallation neutron source science center Dongguan523803China Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China School of materials science and Engineering University of Science and Technology BeijingBejing 100083China Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical sciences University of Chinese Academy of SciencesBeijing 101408China songshan lake materials laboratory Dongguan523808China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China Ningbo Institute of materials Technology and Engineering Chinese Academy of SciencesNingbo315201China

Solid state refrigeration based on caloric effect is regarded as a potential candidate for replacing vapor-compression *** methods have been proposed to optimize the refrigeration properties of caloric materials,of which single field tuning as a relatively simple way has been systemically ***,single field tuning with few tunable parameters usually obtains an excellent performance in one specific aspect at the cost of worsening the performance in other aspects,like attaining a large caloric effect with narrowing the transition temperature range and introducing *** of the shortcomings of the caloric effect driven by a single field,multifield tuning on multicaloric materials that have a coupling between different ferro-orders came into *** review mainly focuses on recent studies that apply this method to improve the cooling performance of materials,consisting of enlarging caloric effects,reducing hysteresis losses,adjusting transition temperatures,and widening transition temperature spans,which indicate that further progress can be made in the application of this ***,research on the sign of lattice and spin contributions to the magnetocaloric effect found new phonon evolution mechanisms,calling for more attention on multicaloric *** progress including improving cyclability of FeRh alloys by introducing second phases and realizing a large reversible barocaloric effect by hybridizing carbon chains and inorganic groups is described in brief.

关键词： phase transition regulation caloric effect solid state refrigeration

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Structure and magnetic properties of the S=3/2 zigzag spin chain antiferromagnet BaCoTe_(2)O_(7)

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science China(Physics,Mechanics & Astronomy) 2021年第8期64卷 91-97页

作者： Lisi Li Xunwu Hu Zengjia Liu Jia Yu Benyuan Cheng Sihao Deng Lunhua He Kun Cao Dao-Xin Yao Meng Wang center for neutron science and Technology School of PhysicsSun Yat-sen UniversityGuangzhou 510275China Shanghai Institute of Laser Plasma Shanghai 201800China center for High Pressure science and Technology Advanced Research Shanghai 201203China spallation neutron source science center Dongguan 523803China Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China songshan lake materials laboratory Dongguan 523808China

We report a study of the structure and magnetic properties of the S=3/2 zigzag spin chain compound BaCoTe_(2)O_(7).neutron diffraction measurements show that it crystallizes in the noncentrosymmetric space group Ama2 with a canted↑↑↓↓spin structure along the quasi-one-dimensional zigzag chain and a moment size of 1.89(2)μBat 2 *** magnetic susceptibility and specific heat measurements yield an antiferromagnetic phase transition at TN=6.2 K.A negative Curie-Weiss temperature,ΘCW=-74.7(2) K,and an empirical frustration parameter,f=|ΘCW|/TN≈12,are obtained by fitting the magnetic susceptibility,indicating antiferromagnetic interactions and strong magnetic *** ultraviolet-visible absorption spectroscopy and first-principles calculations,an indirect band gap of 2.68(2) eV is *** propose that the canted zigzag spin chain of BaCoTe_(2)O_(7) may produce a change in the polarization via the exchange-striction mechanism.

关键词： antiferromagnet zigzag spin chain magnetic frustration spin structure

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Er-Y-Cr-Si化合物在极低温区的巨低场磁热效应

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science China materials 2023年第5期66卷 2039-2050页

作者：奚磊郑新奇高亚伟许家旺刘超凡王鼎淞徐菊萍殷雯杨淑娴靳宝杰朱梦媛许玮峯申见昕张静言黄河吴燕飞顾飞史慧宇陶怡璇王守国沈保根 School of materials science and Engineering Beijing Advanced Innovation Center for Materials Genome EngineeringUniversity of Science and Technology BeijingBeijing 100083China School of materials science and Engineering Anhui UniversityHefei 230601China Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences&University of Chinese Academy of SciencesBeijing 100190China songshan lake materials laboratory Dongguan 523808China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China spallation neutron source science center Dongguan 523803China Ningbo Institute of materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China

高性能低温低场磁热材料在气体液化等领域具有重要的应用前景.本团队通过真空电弧熔炼的方式成功合成了一系列多晶Er_(1-x)Y_(x)Cr_(2)Si_(2)(0≤x≤0.8)样品,这些材料表现出巨大的低场磁热效应.其中Cr含量为0.1的样品显示出最好的低场... 详细信息

高性能低温低场磁热材料在气体液化等领域具有重要的应用前景.本团队通过真空电弧熔炼的方式成功合成了一系列多晶Er_(1-x)Y_(x)Cr_(2)Si_(2)(0≤x≤0.8)样品,这些材料表现出巨大的低场磁热效应.其中Cr含量为0.1的样品显示出最好的低场磁热性能以及接近2 K的合适的工作温区.更重要的是,在0-1 T的磁场变化下,该样品的最大磁熵变峰值以及最大绝热温变峰值分别高达19.2 J kg^(-1)K^(-1)和4.3 K.其磁熵变峰值为目前已报道的20 K以下温区合金类磁热材料的最大值.通过Arrott曲线,平均场理论以及约化磁熵变曲线等手段,证明了磁相变特征为二级相变.物理机理分析表明,10%的Y替代导致高达15.9%的磁熵变峰值增强的原因在于替代样品所具有的大饱和磁化强度以及小饱和磁场.

关键词： magnetocaloric effect magnetic structure RCr_(2)Si_(2)compounds

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The innate interfacial elastic strain field of a transformable B2 precipitate embedded in an amorphous matrix

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npj Computational materials 2023年第1期9卷 41-48页

作者： Xiaoling Fu Yujun Lin Mixun Zhu Kai Wang Jiaqing Wu Xing Tong Wenli Song Ming Jen Tan Yuanzheng Yang Jun Shen Gang Wang Chan Hung Shek Robert O.Ritchie School of materials and Energy Guangdong University of TechnologyGuangzhou 510006China songshan lake materials laboratory Dongguan 523808China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China spallation neutron source science center Dongguan 523803China Singapore Centre for 3D Printing School of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore 639798Singapore School of materials science and Engineering Fujian University of TechnologyFuzhou 350118China Institute of materials Shanghai UniversityShanghai 200444China Department of materials science and Engineering City University of Hong KongKowloon TongHong Kong SARChina Department of materials science&Engineering University of CaliforniaBerkeleyCA 94720USA

When a transformable B2 precipitate is embedded in an amorphous matrix,it is often experimentally observed that the crystalline-amorphous interface not only serves as an initiation site for the martensitic transformation due to local stress concentrations,but also as an inhibitor to stabilize the transformation,the latter being attributed to the“confinement effect”exerted by the amorphous matrix,according to the Eshelby *** two seemingly incongruous factors are examined in this study using molecular dynamics simulations from an atomic interaction *** innate strain gradient in the vicinity of the crystalline-amorphous interface is *** actual interface,the compressive/dilatative transition,and the interfacial maximum strain are investigated to differentiate from the conventional“interface”located within a distance of a few *** innate interfacial elastic strain field model is applicable for the design of materials with a higher degree of martensitic transformation and controllable stress concentration,even in cryogenic environments.

关键词： strain transformation martensitic

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Magneto-Elastic Coupling in a Sinusoidal Modulated Magnet Cr_(2)GaN

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Chinese Physics Letters 2022年第9期39卷 72-75页

作者：毛慧灿李玉峰任清勇褚密海 Helen E.Maynard-Casely Franz Demmel Devashibhai Adroja 闻海虎肖荫果罗会仟 Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of sciences Beijing 100049China National laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China spallation neutron source science center Dongguan 523803China School of Advanced materials Shenzhen Graduate SchoolPeking UniversityShenzhen 518055China Australian Centre for neutron Scattering Australian Nuclear Science and Technology OrganisationLucas Heights NSW-2232Australia ISIS Facility Rutherford Appleton LaboratoryChiltonDidcot Oxon OX110QXUnited Kingdom songshan lake materials laboratory Dongguan 523808China

We use neutron powder diffraction to investigate the magnetic and crystalline structure of Cr_(2)GaN.A magnetic phase transition is identified at T≈170 K,whereas no trace of structural transition is observed down to 6 *** Rietveld refinement with irreducible representations,the spin configuration of Cr ions in Cr_(2)GaN is depicted as an incommensurate sinusoidal modulated structure characterized by a propagating vector k=(0.365.0.365.0).Upon warming up to the paramagnetic state,the magnetic order parameter closely resembles to the temperature dependence of c-axis lattice parameter,suggesting strong magneto-elastic coupling in this ***,Cr_(2)Ga N provides a potential platform for exploration of magnetically tuned properties such as magnetoelectric,magnetostrictive and magnetocaloric effects,as well as their applications.

关键词： magnetic Elastic Coupling

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Zintl Phase BaAgSb: Low Thermal Conductivity and High Performance Thermoelectric Material in Ab Initio Calculation

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Chinese Physics Letters 2021年第4期38卷 87-90页

作者：王绍菲张志刚王保田张俊荣王芳卫 Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China spallation neutron source science center Dongguan 523808China School of Nuclear sciences and Technology University of Chinese Academy of SciencesBeijing 100049China Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China songshan lake Material laboratory Dongguan 523808China Collaborative Innovation center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Thermoelectric materials are critical parts in thermal electric ***,Zintl phase BaAgSb in space group of P63/mmc is reported as a promising thermoelectric material in density function *** anisotropic lattice thermal conductivity and phonon transport properties are investigated in *** strong phonon-phonon scattering in BaAgSb exhibits ultra-low lattice thermal conductivity of 0.5. W·m^(-1)·K^(-1) along c-axis at 800 K,and high thermoelectric performance ZT=0.94 at 400 *** mix of covalent and ionic bond supports high carrier mobility and low thermal *** unusual features make BaAgSb a potential thermoelectric material.

关键词： conductivity. theory. Conductivity

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具有超低热导率的一维铋硒卤族化合物

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science China materials 2020年第9期63卷 1759-1768页

作者：王东洋黄志伟张杨郝丽杰王广涛邓司浩王洪亮陈洁何伦华肖宝徐亚东 Stephen J.Pennycook 武海军赵立东 School of materials science and Engineering Beihang UniversityBeijing 100191China State Key laboratory for Mechanical Behavior of materials Xi’an Jiaotong UniversityXi’an 710049China Instrumental Analysis center of Xi’an Jiaotong University Xi’an Jiaotong UniversityXi’an 710049China Department of materials science and Engineering National University of SingaporeSingapore 117575Singapore Department of Nuclear Physics Neutron Scattering LaboratoryChina Institute of Atomic EnergyBeijing 102413China School of Physics Henan Normal UniversityXinxiang 453007China spallation neutron source science center Dongguan 523803China Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China songshan lake materials laboratory Dongguan 523808China State Key laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

本征低热导率材料的研究具有重要的科学意义,已引起广泛关注.本工作报道了一类具有简单一维晶体结构的超低热导率材料:铋硒卤族化合物(BiSeX,X=Br,I).研究发现,BiSeI的热导率在5.3K仅为~0.27Wm^-1K^-1,达到了最低本征热导率的理论极限值... 详细信息

本征低热导率材料的研究具有重要的科学意义,已引起广泛关注.本工作报道了一类具有简单一维晶体结构的超低热导率材料:铋硒卤族化合物(BiSeX,X=Br,I).研究发现,BiSeI的热导率在5.3K仅为~0.27Wm^-1K^-1,达到了最低本征热导率的理论极限值.本研究采用第一性原理计算结合粉末中子衍射和变温球差扫描透射电子显微镜表征,深入探究了其超低热导率的机制.研究表明,BiSeX的一维结构赋予了材料低热导特性:弱的成键特性、低的声子速度、声学支和光学支的强非简谐性以及Bi和卤族元素较大的偏移效应,从而有效阻碍了声子输运,使得BiSeX具有超低的热导率.本研究提出了在具有一维结构的材料中寻找低传导特性的新思路,该研究思路在热电材料和热障涂层材料等低热传导需求领域中具有广阔的应用前景.

关键词： low thermal conductivity 1D bulk material bismuth selenohalides first-principles calculations

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Response of HD-V2 radiochromic film to argon ions

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Chinese Physics B 2021年第8期30卷 282-286页

作者：程蕾张喆梁贵云李玉同 Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences(CAS)Beijing 100190China School of Physical sciences University of Chinese Academy of SciencesBeijing 100049China Key laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100012China songshan lake materials laboratory Dongguan 523808China CAS center for Excellence in Ultra-intense Laser science Shanghai 201800China

A two-dimensional dose detector for ion beam is required in many high energy density physics *** a solid detector,the GAFChromic film offers a good spatial resolution and dosimetric *** an absolute dose measurement,the relative effectiveness,which represents the darkening efficiency of the film to a radiation source,needs to be taken into *** this contribution,the dose-response of HD-V2 to argon ions is presented for the first *** calibration was taken over the dose range of 65.Gy-660 Gy with 8-keV argon *** response of net optical density is from 0.01 to ***-color dose-response functions are *** relative effectiveness for the argon ion beams is about 5.,much lower than that of protons and carbon *** explain this effect,the inactivation probability based on track theory of ion bombardment is ***,a theoretical prediction of the relative effectiveness for single ion is presented,showing the dependence of the darkening efficiency on the atomic number and the incident energy of ions.

关键词： radiochromic film dosimetry ion bombardment relative effectiveness

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Structure-Spin-Transport Anomaly in Quasi-One-Dimensional Ba9Fe3Te15.under High Pressure

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Chinese Physics Letters 2020年第8期37卷 101-107页

作者：张俊金美玲李翔望贤成赵建发刘影段磊李文敏曹立朋陈碧娟王丽娟孙菲王永刚杨留响肖玉明邓正冯少敏靳常青朱金龙 center for High Pressure science&Technology Advanced Research Beijing 100094China Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physics University of Chinese Academy of SciencesBeijing 100190China Key laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) School of PhysicsBeijing Institute of TechnologyBeijing 100081China Xi'an Modern Chemistry Research Institute Xi'an 710065China High Pressure Collaborative Access Team(HPCAT) Advanced Photon SourceArgonne National LaboratoryArgonneIllinois 60439USA songshan lake materials laboratory Dongguan 523808China Department of Physics Southern University of Science and TechnologyShenzhen 518055China

Recently,a series of novel compounds Ba3MX5.M=Fe,Ti,V;X=Se,Te)with hexagonal crystal structures composed of quasi-1-dimensional(1D)magnetic chains has been synthesized by our research team using high-pressure and high-temperature *** initial hexagonal phases persist to the maximum achievable pressure,while spin configurations and magnetic interactions may change dramatically as a result of considerable reductions in interchain separations upon *** compounds therefore offer unique possibilities for studying the evolution of intrinsic electronic structures in quasi-1D magnetic *** we present a systematic investigation of Ba9Fe3Te15.in which the interchain separations between trimerized 1D chains(~10.2Å)can be effectively modulated by external high *** crystal structure especially along the 1D chains exhibits an abnormal expansion at^GPa,which accompanies trimerization entangled anomalous mixed-high-low spin *** insulator-metal transition has been observed under high pressure as a result of charge-transfer gap ***-induced superconductivity emerges at 26 GPa,where the charge-transfer gap fully closes,3D electronic configuration forms and local spin fully collapses.

关键词： transition. hexagonal chains

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Electronic structure of correlated topological insulator candidate YbB6 studied by photoemission and quantum oscillation

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Chinese Physics B 2020年第1期29卷 70-75页

作者：张腾李岗孙淑翠秦娜康璐姚淑华翁红明 S K Mo 李璐柳仲楷杨乐仙陈宇林 State Key laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Department of Physics University of MichiganAnn ArborMI 48109USA Beijing National laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China National laboratory of Solid State Microstructures&Department of materials science and Engineering Nanjing UniversityNanjing 210093China Collaborative Innovation center of Quantum Matter BeijingChina songshan lake materials laboratory Dongguan 523808China CAS center for Excellence in Topological Quantum Computation Beijing 100190China Physical science laboratory Huairou National Comprehensive Science CenterBeijing 101400China Advanced Light source Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA School of Physical science and Technology ShanghaiTech University and CAS-Shanghai Science Research CenterShanghai 201210China ShanghaiTech laboratory for Topological Physics Shanghai 200031China Frontier science center for Quantum Information Beijing 100084China Department of Physics Clarendon LaboratoryUniversity of Oxford Parks RoadOxford OX13PUUK

Angle-resolved photoemission spectroscopy(ARPES)and torque magnetometry(TM)measurements have been carried out to study the electronic structures of a correlated topological insulator(TI)candidate Yb *** observed clear surface states on the[001]surface centered at theГ^- and М^- points of the surface Brillouin ***,the fermiology revealed by the quantum oscillation of TM measurements agrees excellently with ARPES ***,the band structures we observed suggest that the band inversion in Yb B6 happens between the Yb5.dand B2bands,instead of the Yb5.and Yb4fbands as suggested by previous theoretical investigation,which will help settle the heavy debate regarding the topological nature of samarium/ytterbium hexaborides.

关键词： topological insulator electronic structure surface states

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