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Bismuth-based halide double perovskite Cs_(2)KBiCl_(6): Disorder and luminescence

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Chinese Chemical Letters 2024年第5期35卷 504-508页

作者： Pan Liu Yanming Sun Alberto J.Fernández-Carrión Bowen Zhang Hui Fu Lunhua He Xing Ming Congling Yin Xiaojun Kuang MOE Key laboratory of New Processing Technology for Nonferrous Metal and materials Guangxi Key Laboratory of Optic and Electronic Materials and DevicesCollege of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004China Analytical Instrumentation center College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China spallation neutron source science center Dongguan 523803China Chinese Academic of science Institute of PhysicsBeijing National Laboratory for Condensed Matter PhysicsBeijing 100190China songshan lake materials laboratory Dongguan 523808China College of science Guilin University of TechnologyGuilin 541004China College of Chemistry and Bioengineering Guilin University of TechnologyGuilin 541004China

A new bismuth-based halide double perovskite Cs_(2)KBiCl_(6) was isolated successfully through solid-state reactions and investigated using X-ray and neutron *** than an ordered structure,the crystal structure consists of shifted Cs,K,Bi,and Cl sites from the ideal positions with fractional occupancy in compensation,leading to variable local coordination of Cs^(+)ions,as revealed by^(133)Cs solid-state nuclear magnetic resonance ***_(2)KBiCl_(6) displays volume hysteresis at 5.298 K range upon heating and *** Cs_(2)KBiCl_(6) has a direct bandgap of 3.35.2)eV and red-shift luminescence of around 600 nm upon Mn doping compared with the Na *** stabilization of disordered structure in Cs_(2)KBiCl_(6) is related to two factors including the large-sized K^(+)cation which prefers to coordinate with more than six Cl^(-),and the Bi^(3+)with 6s^(2) lone pair which has a preference for a local asymmetric *** findings could have general application and help to understand the structure and property of halide perovskites.

关键词： Halide perovskite Double perovskite Luminescence Disordered structure Direct bandgap

Flexible UV detectors based on in-situ hydrogen doped amorphous Ga_(2)O_(3) with high photo-to-dark current ratio

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materials Futures 2024年第1期3卷 181-189页

作者： Yanxin Sui Huili Liang Wenxing Huo Xiaozhi Zhan Tao Zhu Zengxia Mei songshan lake materials laboratory DongguanGuangdong 523808People’s Republic of China Institute of Physics Chinese Academy of SciencesBeijing 100190People’s Republic of China Department of Biomedical Engineering Tianjin University92 Weijin RoadTianjin 300072People’s Republic of China China spallation neutron source DongguanGuangdong 523803People’s Republic of China

Amorphous Ga_(2)O_(3)(a-Ga_(2)O_(3))has been attracting more and more attention due to its unique merits such as wide bandgap(∼4.9 eV),low growth temperature,large-scale uniformity,low cost and energy efficient,making it a powerful competitor in flexible deep ultraviolet(UV)*** the responsivity of the ever-reported a-Ga_(2)O_(3)UV photodetectors(PDs)is usually in the level of hundreds of A/W,it is often accompanied by a large dark current due to the presence of abundant oxygen vacancy(VO)defects,which severely limits the possibility to detect weak signals and achieve versatile *** this work,the VO defects in a-Ga_(2)O_(3)thin films are successfully passivated by in-situ hydrogen doping during the magnetron sputtering *** a result,the dark current of a-Ga_(2)O_(3)UV PD is remarkably suppressed to 5.17×10^(-11) A at a bias of 5.***,the photocurrent of the corresponding device is still as high as 1.37×10^(-3)A,leading to a high photo-to-dark current ratio of 2.65.107 and the capability to detect the UV light with the intensity below 10 nW cm^(-2).Moreover,the H-doped a-Ga_(2)O_(3)thin films have also been deposited on polyethylene naphtholate substrates to construct flexible UV PDs,which exhibit no great degradation in bending states and fatigue *** results demonstrate that hydrogen doping can effectively improve the performance of a-Ga_(2)O_(3)UV PDs,further promoting its practical application in various areas.

关键词： Ga_(2)O_(3) hydrogen doping ultraviolet photodetector photo-to-dark current ratio neutron reflection

C-Type Antiferromagnetic Structure of Topological Semimetal CaMnSb_(2)

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Chinese Physics Letters 2024年第3期41卷 114-120页

作者：李博曾旭涛徐千惠杨帆项俊森钟恒扬邓司浩何伦华徐菊萍殷雯鲁兴业刘慧颖胜献雷金文涛 School of Physics Beihang UniversityBeijing 100191China Beijing National laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China center for Advanced Quantum Studies and Department of Physics Beijing Normal UniversityBeijing 100875China spallation neutron source science center Dongguan 523803China songshan lake materials laboratory Dongguan 523808China

Determination of the magnetic structure and confirmation of the presence or absence of inversion(P)and time reversal(Τ)symmetry is imperative for correctly understanding the topological magnetic *** highquality singl... 详细信息

关键词： ferromagnetic magnetic manganese

Tuning anionic redox activity to boost high-performance sodium-storage in low-cost Na_(0.67)Fe_(0.5.Mn_(0.5.O_(2) cathode

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Journal of Energy Chemistry 2022年第10期31卷 214-222,I0005页

作者： Jianyue Jiao Kang Wu Na Li Enyue Zhao Wen Yin Zhongbo Hu Fangwei Wang Jinkui Zhao Xiaoling Xiao College of materials science and Opto-electronic Technology Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China songshan lake materials laboratory Dongguan 523808GuangdongChina spallation neutron source science center Dongguan 523803GuangdongChina Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Na-based layered iron-manganese oxide Na_(0.67)Fe_(0.5.Mn_(0.5.O_(2) containing only low-cost elements is a promising cathode for Na-ion batteries used in large-scale energy storage ***,the poor cycle stability restricts its practical *** capacity decay of Na_(0.67)Fe_(0.6)Mn_(0.5.O_(2) mainly originates from the irreversible anionic redox reaction charge compensation due to the high-level hybridization between oxygen and ***,we rationally design a surface Ti doping strategy to tune the anionic redox reaction activity of Na_(0.67)Fe_(0.5.Mn_(0.5.O_(2) and improve its Na-storage *** doped Ti ions not only enlarge the Na migration spacing layer but also improve the structure stability thanks to the strong Ti-O *** importantly,the d0-shell electronic structure of Ti^(4+) can suppress the charge transfer from the oxidized anions to cations,thus reducing the anionic redox reaction activity and enhancing the reversibility of charge *** modified Na_(0.67)Fe_(0.5.Mn_(0.5.O_(2) cathode shows a reversible capacity of 198 mA h g^(-1) and an increased capacity retention from 15. to 73% after about1 month of ***,a superior Na-ion diffusion kinetics and rate capability are also *** work advances the commercialization process of Na-based layered iron-manganese oxide cathodes;on the other hand,the proposed modification strategy paves the way for the design of high-performance electrode materials relying on anionic redox reactions.

关键词： Na-ion battery P2-Na_(0.67)Fe_(0.5.Mn_(0.5.O_(2) Anionic redox reaction Surface Ti doping

Evidence for distortion-induced local electric polarization in α-RuCl

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science China(Physics,Mechanics & Astronomy) 2024年

作者： Xinrun Mi De Hou Xiao Wang Sabreen Hammouda Caixing Liu Zijian Xiong Han Li Yan Liu Guiwen Wang Aifeng Wang Yisheng Chai Yang Qi Wei Li Xiaoyuan Zhou Yixi Su D.I.Khomskii Mingquan He Zhigao Sheng Young Sun College of Physics Center of Quantum Materials and Devices Chongqing University Anhui Key laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Hefei Institutes of Physical Science Anhui Chinese Academy of Sciences University of science and Technology of China Jülich Centre for neutron scienceat Heinz Maier-Leibnitz Zentrum (JCNS-MLZ) Forschungszentrum Jülich GmbH School of Physics Beihang University Analytical and Testing center Chongqing University State Key laboratory of Surface Physics Department of Physics Fudan University CAS Key laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences II.Physikalisches Institut Universit?t zu K?ln

The spin-orbit assisted Mott insulator α-RuCl3is a prime candidate for material realization of the Kitaev quantum spin *** little attention has been paid to charge degrees of freedom, charge effects, such as electric polarization, may arise in this system. Here, we report distortion-induced local electric polarization in α-RuCl3as evidenced by single-crystal X-ray diffraction,second harmonic generation（SHG） and dielectric measurements. The SHG signal appears at room temperature and develops substantially in the Kitaev paramagnetic state when short-range spin correlations come into play. Despite sizable pyroelectric currents in the Kitaev paramagnetic state, the absence of hysteresis in the polarization-electric field（P-E） points to the shortrange nature of electric polarization. This localized electric polarization is likely the result of distortion-induced charge dimerization, achieved through virtual hopping-induced charge redistribution. In addition, the electric polarization is boosted by short-range spin correlations via spin-phonon coupling in the Kitaev paramagnetic state. Our results emphasize the importance of charge degrees of freedom in α-RuCl3, which establish a novel platform to investigate charge effects in Kitaev materials.

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Formation of novel TRIP-ductilized bulk metallic glass composites by manipulating nucleation kinetics via minor alloying

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Rare Metals 2023年第7期42卷 2182-2188页

作者： Xi-Lai Jiang Wen-Li Song Ming Yang Yuan-Bo Zhou Yan Huang Zhi-Chao Lu Yi-Bo Zhang Jie Dong Liang Wang Bo Peng Chun-Ming Hu Jin-Kui Zhao Sheng-Zhong Kou Dong Ma School of materials science and Engineering Lanzhou University of TechnologyLanzhou730050China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing100049China spallation neutron source science center Dongguan523803China neutron science Platform Songshan Lake Materials LaboratoryDongguan523808China State Key laboratory for Advanced Metals and materials University of Science and Technology BeijingBeijing100083China Institute of Physics Chinese Academy of Sciences(CAS)Beijing100190China

A series of conical bulk metallic glass composites(BMGCs)with compositions of Zr_(47)Cu_(47-x)Al_(5.Ag_(1)Ga_(x)(x=0,1,2,4;at%)were synthesized using the minor alloying method to investigate the effect of Ga addition ... 详细信息

关键词： alloying properties glass

Tailoring interphase structure to enable high-rate, durable sodium-ion battery cathode

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Journal of Energy Chemistry 2022年第5期31卷 564-571页

作者： Na Li Shaofei Wang Enyue Zhao Wen Yin Zhigang Zhang Kang Wu Juping Xu Yoshihiro Kuroiwa Zhongbo Hu Fangwei Wang Jinkui Zhao Xiaoling Xiao College of materials science and Opto-electronic Technology Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China spallation neutron source science center Dongguan 523803GuangdongChina songshan lake materials laboratory Dongguan 523808GuangdongChina Department of Physical science Hiroshima UniversityHigashihiroshimaHiroshima 739-8526Japan Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Na-based layered transition metal oxides with O_(3)-type structure have been considered to be promising cathodes for Na-ion batteries. However, the intrinsically limited Na-ion conductivity induced by the Otype Na-coordinate environment compromises their rate and cycle capability, hindering their practical application. Here, we report an interphase-structure tailoring strategy that improves the electrochemical properties of O_(3)-type layered cathodes achieved through surface coating and doping ***, a Zr-doped interphase structure is designed in the model compound NaNi_(1/3)Mn_(1/3)Fe_(1/3)O_(2) using the ionic conductor Na_(3)Zr_(2)Si_(2)PO_(12) as the surface coating material and Zr-dopant provider. We discover that the modified NaNi_(1/3)Mn_(1/3)Fe_(1/3)O_(2)cathode shows a stable Na-storage structure as well as an enhanced rate/cycle capability. Combined with theoretical calculations, it is suggested that the superior electrochemical performances originate from the Zr-doped interphase structure, which has an enlarged Na layer spacing that forms favorable Na-ion diffusion channels. This work highlights a general material interface optimization method which opens a new perspective for fabricating high-performance electrodes for Na-ion batteries and beyond.

关键词： Na-ion battery NaNi_(1/3)Mn_(1/3)Fe_(1/3)O_(2)cathode Interphase structure Zr doping Surface interface modification

Giant low-field magnetocaloric effect in ferromagnetically ordered Er_(1-x)Tm_(x)Al_(2)(0≤x≤1)compounds

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Journal of materials science & Technology 2023年第15期146卷 168-176页

作者： Shuxian Yang Xinqi Zheng Dingsong Wang Juping Xu Wen Yin Lei Xi Chaofan Liu Jun Liu Jiawang Xu Hu Zhang Zhiyi Xu Lichen Wang Yihong Yao Maosen Zhang Yichi Zhang Jianxin Shen Shouguo Wang Baogen Shen School of materials science and Engineering Beijing Advanced Innovation Center for Materials Genome EngineeringUniversity of Science and Technology BeijingBeijing 100083China Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences&University of Chinese Academy of SciencesBeijing 100190China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China spallation neutron source science center Dongguan 523803China School of materials science and Engineering Anhui UniversityHefei 230601China Department of Energy and Power Engineering School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China songshan lake materials laboratory Dongguan 523808China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China Ningbo Institute of materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China

Magnetocaloric material is the key working substance for magnetic refrigerant technology,for which the low-field and low-temperature magnetocaloric effect(MCE)performance is of great importance for practical applications at low ***,a giant low-field magnetocaloric effect in ferromagnetically ordered Er_(1-x)Tm_(x)Al_(2)(0≤x≤1)compounds was reported,and the magnetic structure was characterized based on low-temperature neutron powder *** increasing Tm content from 0 to 1,the Curie temperature of Er_(1-x)Tm_(x)Al_(2)(0≤x≤1)compounds decreases from 16.0 K to 3.6 *** Er_(0.7)Tm_(0.3)Al_(2) compound,it showed the largest low-field magnetic entropy change(–SM)with the peak value of 17.2 and 25.7 J/(kg K)for 0–1 T and 0–2 T,***(–SM)max up to 17.2 J/(kg K)of Er0.7Tm0.3Al2 compound for 0–1 T is the largest among the intermetallic magnetocaloric materials ever reported at temperatures below 20 *** peak value of adiabatic temperature change(Tad)max was determined as 4.13 K and 6.87 K for 0–1 T and 0–2 T,*** characteristic of second-order magnetic transitions was confirmed on basis of Arrott plots,the quantitative criterion of exponent n,rescaled universal curves,and the mean-field theory *** outstanding low-field MCE performance with low working temperatures indicates that Er_(1-x)Tm_(x)Al_(2)(0≤x≤1)compounds are promising candidates for magnetic cooling materials at liquid hydrogen and liquid helium temperatures.

关键词： Magnetocaloric effect Low field magnetocaloric effect Magnetic structure RAl_(2)compounds

Phase transition regulation and caloric effect

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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