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Thermoelectric properties of (GeTe)_(1-x)[(Ag_(2)Te)_(0.4)(Sb_(2)Te_(3))_(0.6)]_(x) alloys

Rare Metals 2022年第3期41卷 921-930页

作者： Hong-Xia Liu Xin-Yue Zhang Zhong-Lin Bu Wen Li Yan-Zhong Pei School of materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Laboratory of magnetic and Electric Functional materials and the Applications The Key Laboratory of Shanxi ProvinceTaiyuan 030024China Interdisciplinary materials Research center School of Materials Science and EngineeringTongji UniversityShanghai 201804China

The(GeTe)_(x)(AgSbTe_(2))_(100-x)alloys(TAGS-x)have been demonstrated as a promising p-type candidate for thermoelectric applications,attracting numerous atten-tions on the advancements of thermoelectric *** of carrier concentration for optimizing ther-moelectric performance in TAGS can be achieved by varying the ratio of Ag to Sb,and the Ag/Sb ratio of~2/3 has been proven as the optimal ***,this work focuses on the systematic investigation on ther-moelectric properties of(GeTe)_(1-x)[(Ag_(2)Te)_(0.4)(Sb_(2)Te_(3))_(0.6)]_(x) *** crystal structure for the alloys transfers from rhombohedral to cubic at room temperature as x≥*** evolution of band parameter is estimated using a single parabolic band(SPB)model with acoustic phonon *** density of states effective mass increases with x increasing,which leads to an enhancement of Seebeck coefficient along with a reduction in Hall mobility due to the additional carrier scattering by point ***-while,the lattice thermal conductivity of lower than~0.7 W·m^(-1)·K^(-1) in the entire temperature range and the lowest one of only 0.45 W·m^(-1)·K^(-1) is achieved due to additional phonon scattering by point *** a result,a peak thermoelectric figure of merit(zT)of~1.80 and an average one of~1.37 in 300–800 K are realized in non-stoichiometric TAGS alloys here.

关键词： Thermoelectric Tellurium-antimonygermanium-silver(TAGS) Crystal structure Lattice thermal conductivity

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Electronic structures and optical properties of HfO_2–TiO_2 alloys studied by first-principles GGA + U approach

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Chinese Physics B 2018年第2期27卷 510-515页

作者：李金平孟松鹤杨程陆汉涛遠山貴巳 center for Composite materials and Structure Harbin Institute of Technology Harbin 150080 China center for Interdisciplinary Studies & Key Laboratory for Magnetism and magnetic materials of the MoE Lanzhou University Lanzhou 730000 China Department of Applied Physics Tokyo University of Science Tokyo 125-8585 Japan

The phase diagram of HfO_2–TiO_2 system shows that when Ti content is less than 33.0 mol%, HfO_2–TiO_2 system is monoclinic; when Ti content increases from 33.0 mol% to 52.0 mol%, it is orthorhombic; when Ti content reaches more than 52.0 mol%, it presents rutile phase. So, we choose the three phases of HfO_2–TiO_2 alloys with different Ti content values. The electronic structures and optical properties of monoclinic, orthorhombic and rutile phases of HfO_2–TiO_2 alloys are obtained by the first-principles generalized gradient approximation（GGA）＋U approach, and the effects of Ti content and crystal structure on the electronic structures and optical properties of HfO_2–TiO_2 alloys are investigated. By introducing the Coulomb interactions of 5 d orbitals on Hf atom（U_1~d）, those of 3 d orbitals on Ti atom（U_2~d）, and those of 2 p orbitals on O atom（Up） simultaneously, we can improve the calculation values of the band gaps, where U_1~d, U_2~d, and Up values are 8.0 eV, 7.0 eV, and 6.0 eV for both the monoclinic phase and orthorhombic phase, and 8.0 eV, 7.0 eV, and 3.5 eV for the rutile phase. The electronic structures and optical properties of the HfO_2–TiO_2 alloys calculated by GGA ＋U_1~d（U_1~d= 8.0 eV）＋U_2~d（U_2~d= 7.0 eV）＋U^p（U^p= 6.0 eV or 3.5 eV） are compared with available experimental results.

关键词： HfO2–TiO2 alloys GGA +U electronic structure optical properties

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One-step preparation of carbon nanotubes with nickel as the core

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Science China(Technological Sciences) 2011年第1期54卷 76-80页

作者： RUAN Zheng LIU XianSong HU Feng ZHU DeRu CHENG ChunHao QIU ShiXing ZHOU Dan GAO HuaMin JIA DaoNing WANG PengPeng Engineering Technology Research center of magnetic materials School of Physics & Materials Science Anhui University Hefei 230039 China Chemistry and Material Science Department Chaohu College Chaohu 238000 China

CNTs with core-shell structure were successfully synthesized by a microwave-assisted polyol method,and magnetic Ni nanoparticles were employed as a catalyst. The preparation method is fast and simple. The structures,morphology and magnetic properties of the as-synthesized samples were investigated using Raman spectrometer,X-ray diffraction (XRD),transmission electron microscopy (TEM),vibrating sample magnetometer (VSM),respectively. The XRD results suggested that Ni particles used as a catalyst in our experiment were nano-sized. In this paper,magnetic Ni nanoparticles were employed as a catalyst,and an electric spark on metal Ni nanoparticles with the microwave eddy current effect could induce CNTs’ formation with the further reaction. The length of hollow carbon nanotubes was micro-sized and the diameters of most of the CNTs were varying from 18 to 20 nm according to the TEM images. magnetic measurements demonstrated that CNTs with core-shell structure indicated a characteristic ferromagnetic behavior compared with Ni nanoparticles.

关键词： microwave.assisted Ni catalyst carbon nanotube core-shell structure

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Log-periodic quantum magneto-oscillations and discrete-scale invariance in topological material HfTe5

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National Science Review 2019年第5期6卷 914-920页

作者： Huichao Wang Yanzhao Liu Yongjie Liu Chuanying Xi Junfeng Wang Jun Liu Yong Wang Liang Li Shu Ping Lau Mingliang Tian Jiaqiang Yan David Mandrus Ji-Yan Dai Haiwen Liu Xincheng Xie Jian Wang International center for Quantum materials School of Physics Peking University Department of Applied Physics The Hong Kong Polytechnic University Wuhan National High magnetic Field center Huazhong University of Science and Technology High magnetic Field Laboratory Chinese Academy of Sciences center of Electron Microscopy State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University materials Science and Technology Division Oak Ridge National Laboratory Department of materials Science and Engineering University of Tennessee center for Advanced Quantum Studies Department of PhysicsBeijing Normal University Collaborative Innovation center of Quantum Matter CAS center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing Academy of Quantum Information Sciences

Discrete-scale invariance（DSI） is a phenomenon featuring intriguing log-periodicity that can be rarely observed in quantum ***, we report the log-periodic quantum oscillations in the longitudinal magnetoresistivity(ρ;) and the Hall traces(ρ;) of Hf Te5 crystals, which reveal the DSI in the transport-coefficients *** oscillations in ρ;and ρ;show the consistent log B-periodicity with a phase *** finding of the log B oscillations in the Hall resistance supports the physical mechanism as a general quantum effect originating from the resonant *** with theoretical simulations, we further clarify the origin of the log-periodic oscillations and the DSI in the topological *** work evidences the universality of the DSI in the Dirac materials and provides indispensable information for a full understanding of this novel phenomenon.

关键词： log-periodic oscillations discrete-scale invariance topological materials Dirac materials magnetoresistance Hall resistance

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Development of soft magnetic amorphous alloys with distinctly high Fe content

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Science China(Physics,Mechanics & Astronomy) 2017年第10期60卷 45-50页

作者： PingBo Chen AnDing Wang ChengLiang Zhao AiNa He Gang Wang ChunTao Chang XinMin Wang Chain-Tsuan Liu Key Laboratory of magnetic materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China Zhejiang Province Key Laboratory of magnetic materials andApplication Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China Laboratory for Mierostructures Institute of Materials Science Shanghai University Shanghai 200444 China center for Advanced Structural materials Department of Mechanical and Biomedical Engineering College of Science and Engineering City University of Hong Kong Hong Kong 999077 China

This paper reports on the preparation of Fe82.7-85.7Si2-4.9B9.2-11.2P1.***.2.7C0,8 soft magnetic amorphous alloys with a distinctly high Fe content of 93.5-95.5 wt.% by component design and composition adjustment. All alloys can be readily fabricated into completely amorphous ribbon samples with good surface quality by the single copper roller melt-spinning method. These alloys show good bending ductility and excellent magnetic properties after annealing, i.e., low coercivity （He） of 3.3-5.9 A/m, high permeability （μe） of 5000-10000 and high flux saturation density （Bs） of 1.63-1.66 T. The mechanism of the good glass forming ability （GFA）and soft-magnetic properties are explored. The amorphous alloys with the high Fe content comparable to that of the desired high Si alloy can be promising candidates for the potential application in electric devices.

关键词： metallic glasses alloy design annealing magnetic properties shear band

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Influence of thermal history on the crystallization behavior of high-Bs Fe-based amorphous alloys

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Science China(Physics,Mechanics & Astronomy) 2023年第5期66卷 173-180页

作者： Bowen Zang Lijian Song Richard Parsons Jie Shen Meng Gao Yan Zhang Juntao Huo Yonghao Sun Fushan Li Kiyonori Suzuki Jun-Qiang Wang Weihua Wang CAS Key Laboratory of magnetic materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Department of materials Science and Engineering Monash UniversityClayton VIC 3800Australia Institute of Physics Chinese Academy of SciencesBeijing 100190China School of materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

A crucial step in creating cutting-edge soft magnetic alloys is the nanocrystallization of Fe-based amorphous ***,it is unclear how the thermal history affects the *** this work,high-precision nanocalorimetry and in-situ hightemperature transmission electron microscopy are used to systematically examine how the pre-annealing relaxation process affects the nanocrystallization of Fe-based amorphous *** discover that the glass with more thermal energy storage will crystallize into superb nanocrystalline structures with exceptionally advanced soft *** soft magnetic properties of Fe-B nanocrystalline alloys can be improved by increasing the relaxation *** finding provides solid and clear evidence for the influences of thermal history on crystallization behavior for Fe-based amorphous alloys,which is helpful for designing advanced soft magnetic nanocrystalline alloys.

关键词： amorphous alloys enthalpy relaxation nanocrystallization microstructure development soft magnetic properties

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magnetic Property of a Spin-5/2 Trigonal Prismatic as a Model for a Molecule-based Compound Cs_4Na_7[Fe_6(OH)_3(A-ɑ-GeW_9O_(34)(OH)_3)_2]·30H_2O

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Journal of Wuhan University of Technology(materials Science) 2015年第4期30卷 868-872页

作者：李宗宝 YAO Kailun Department of Physics Tongren University Department of Physics and Wuhan High magnetic Field center Huazhong University of Science and Technology International center of materials Physics Chinese Academy of Science

The magnetic susceptibility, high field magnetization, and specific heat of spin-5/2 trigonal prismatic ＂Fe6＂ model were investigated in terms of the Heisenberg model by algebraic method. The experimental results showed that the adequate magnetization description of the Heisenberg model were provided. The magnetization curve has tour clear plateaus while the susceptibility exhibits typical anti- ferromagnetic feature. Two board peaks of the specific heat are observed at around 3 K and 15 K, while only a small sharp-peak at low field. Meanwhile, the magnetic susceptibility displays a sharp peak structure at low temperature, which is well consistent with experimental results.

关键词： magnetic field heisenberg model magnetic properties thermodynamic propertie

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Operation Mode on Pulse Modulation in Atmospheric Radio Frequency Glow Discharges

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Plasma Science and Technology 2016年第10期18卷 974-977页

作者：张杰郭颖黄晓江张菁石建军 College of materials Science and Engineering Donghua University College of Science Donghua University Member of magnetic Confinement Fusion Research center Ministry of Education of the Peoples Republic of China

The discharge operation regime of pulse modulated atmospheric radio frequency （RF） glow discharge in helium is investigated on the duty cycle and frequency of modulation pulses. The characteristics of radio frequency discharge burst in terms of breakdown voltage, alpha（s）- gamma（γ） mode transition voltage and current are demonstrated by the discharge current voltage characteristics. The minimum breakdown voltage of RF discharge burst was obtained at the duty cycle of 20% and frequency of 400 kHz, respectively. The α-γ mode transition of RF discharge burst occurs at higher voltage and current by reducing the duty cycle and elevating the modulation frequency before the RF discharge burst evolving into the ignition phase, in which the RF discharge burst can operate stably in the γ mode. It proposes that the intensity and stability of RF discharge burst can be improved by manipulating the duty cycle and modulation frequency in pulse modulated atmospheric RF glow discharge.

关键词： pulse modulation atmospheric glow discharge discharge operation mode

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Asynchronous responses of mechanical and magnetic properties to structure relaxation for FeNbB bulk metallic glass

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Journal of Iron and Steel Research International 2018年第6期25卷 637-643页

作者： Zhi-kai Gao An-ding Wang Ping-bo Chen Cheng-liang Zhao Fu-shan Li Ai-na He Chun-tao Chang Xin-min Wang Chain-tsuan Liu School of materials Science and Engineering ZhengzhouUniversity Zhengzhou 450001 Henan China Key Laboratory of magnetic materials and Devices NingboInstitute of Materials Technology and Engineering ChineseAcademy of Sciences Ningbo 315201 Zhejiang China Zhejiang Province Key Laboratory of magnetic materials andApplication Technology Ningbo Institute of MaterialsTechnology and Engineering Chinese Academy of SciencesNingbo 315201 Zhejiang China center for Advanced Structural materials Department ofMechanical and Biomedical Engineering College of Scienceand Engineering City University of Hong Kong Hong KongChina

Asynchronous responses of mechanical and magnetic properties to structure relaxation for the Fe71Nb6B23 bulk metallic glass were systematically investigated. It is interesting that this ternary alloy can combinedly exhibit outstanding magnetic and mechanical properties, especially good ductility, after optimally annealing in structure relaxation stage for eliminating the internal stress and homogenizing the microstructure. The alloy exhibits low coercive force of 1.6 A/m, high effective permeability of 15 x 10^3, high fracture strength of 4.2 GPa and good plastic strAln of 1.8%. It is also found that responses of mechanical and magnetic properties to structure relaxation are asynchronous. The glass transition and crystallization will greatly deteriorate the magnetic and mechanical properties. Here we propose a physical picture and demonstrate that the primary structure factors determining magnetic and mechanical properties are different. This work will bring a promising material for application and a new perspective to study the effect of annealing-induced structure relaxation on mechanical and magnetic properties.

关键词： Bulk metallic glass Annealing Mechanical property magnetic property Structure relaxation

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Entanglement dynamics of a moving multi-photon Jaynes-Cummings model in mixed states

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Chinese Physics B 2011年第7期20卷 57-63页

作者：谭磊张玉青朱中华 Institute of Theoretical Physics Lanzhou University Key Laboratory for Magnetism and magnetic materials of Ministry of Education Lanzhou University

Using the algebraic dynamical method, the entanglement dynamics of an atom-field bipartite system in a mixed state is investigated. The atomic center-of-mass motion and the field-mode structure are also included in this system. We find that the values of the detuning and the average photon number are larger, the amplitude of the entanglement is smaller, but its period does not increase accordingly. Moreover, with the increase of the field-mode structure parameter and the transition photon number, the amplitude of the entanglement varies slightly while the oscillation becomes more and more fast. Interestingly, a damping evolution of the entanglement appears when both the detuning and the atomic motion are considered simultaneously.

关键词： algebraic dynamical method entanglement mixed state

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