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Growth and Microstructure of r.f. Sputtered Fe/Ti Multilayers

Journal of materials science & Technology 2001年第5期17卷 521-524页

作者： wei wang shenyang national laboratory for materials science, institute of metal research, chinese academy of sciences, shenyang 110016, china lishi wen department of surface engineering of materials, institute of metal research, chinese academy of science chinese Acad Sci Inst Mat Res Shenyang Natl Lab Mat Sci Shenyang 110016 Peoples R China chinese Acad Sci Inst Mat Res Dept Surface Engn Mat Shenyang 110016 Peoples R China

Fe/Ti multilayers with different modulation wavelengths (Lambda) prepared by r.f. sputtering has been investigated by using cross sectional transmission electron microscopy (XTEM). It was observed that the columnar structure, interface morphology, and metastable phase presented at the interface of the multilayer system strongly depend on the bilayer thickness (Lambda). For high period multilayers, the waviness wavelength of interfaces is about two times broader than the column diameter. For a sample with Lambda =30 nm, its column width and waviness wavelength was about 80, and 190 nm, respectively. Both of them decreased with the reduction of Lambda, so as to nearly equal values of column diameter and waviness wavelength were obtained. The Fe and Ti grains of both 30 nm and 6 nm multilayers are polycrystalline, and have a textured structure. In short bilayer thickness (Lambda =6 nm), the intermetallic compound Fe2Ti was presented at the interfaces due to solid state reaction; for Lambda =2 nm, amorphous phase Ti-rich layer was formed at the interfaces, resulting in a sharp interface multilayer structure.

关键词： Ti Growth and Microstructure of r.f Sputtered Fe/Ti Multilayers Fe

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Enhanced linear magneto-resistance near the Dirac point in topological insulator Bi2(Te1−xSex)3 nanowires

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Nano research 2020年第5期13卷 1332-1338页

作者： LingNan wei ZhenHua wang ZhiDong Zhang Chieh-wen Liu Xuan P.A.Gao shenyang national laboratory for materials science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of materials science and engineering University of Science and Technology of ChinaHefei 230026China department of Physics Case Western Reserve UniversityClevelandOhio 44106USA

We report the composition and back-gate voltage tuned transport properties of ternary compound Bi2(Te1−xSex)3 nanowires synthesized by chemical vapor deposition(CVD).It is found that the population of bulk carriers can be suppressed effectively with increasing the Se concentration *** Bi2(Te1−xSex)3 nanowires with x=25%±5%,the ambipolar surface conduction associated with tuning the Fermi energy across the Dirac point of topological surface states is induced by applying a back-gate ***,we find that while the magnetoresistance(MR)follows the weak antilocalization(WAL)behavior when the Fermi level is tuned away from the Dirac point,MR is enhanced in magnitude and turns more linear in the whole magnetic field range(between±9 T)near the Dirac *** observation of the enhanced linear magneto-resistance(LMR)and crossover from WAL to LMR,near the Dirac point provides a deeper insight into understanding the nature of topological insulator’s surface transport and the relation between these two widely observed magneto-transport phenomena.

关键词： Topological insulator nanowire ambipolar conduction bismuth selenide bismuth telluride linear magneto-resistance weak anti-localization

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Microstructure and nanoindentation hardness of shot-peened ultrafine-grained low-alloy steel

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Journal of Iron and Steel research International 2019年第5期26卷 472-482页

作者： Xiao-wei Feng Juan Xie wen-ying Xue Yong-feng Shen Hong-bo wang Zhen-yu Liu institute of Systems engineering of china academy of engineering Physics Mianyang 621999 Sichuan China Key laboratory for Anisotropy and Texture of materials (MOE) School of Materials Science and Engineering Northeastern University Shenyang 110819 Liaoning China The State Key Lab of Rolling and Automation Northeastern University Shenyang 110819 Liaoning China

The effect of shot peening (SP) on microstructure and hardness of ultrafine-grained (UFG) low-alloy steel was investigated. With increasing shot-peening time from 0.5 to 1.5 h, grain size of UFG low-alloy steel decreases from 400 to 280 nm at surface whilst that of the layer with a depth of 160μm decreases from (230 ± 15) to (75 ± 5) nm. Interestingly, nanoindentation shows that hardness increases linearly with increasing the SP duration, reaching a value as high as (7.10 ± 0.1) GPa at the depth of 160 μm after the SP duration of 1.5 h. The thickness of the SP treated layer is measured as^300 μm. The Hall-Petch (H-P) relationship was established for the hardening layer. Correspondingly, abrasion resistance should be ~51% higher than that of as-prepared UFG low-alloy steel. As shown in SP processing, grain refinement is the key factor responsible for the strengthening of the studied steel.

关键词： Low-alloy steel Shot peening Grain refinement Nanoindentation Hardness

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2D titanium carbide(MXene) electrodes with lower-F surface for high performance lithium-ion batteries

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Journal of Energy Chemistry 2019年第4期28卷 148-153页

作者： Ming Lu Haojie Li wenjuan Han Junnan Chen wen Shi Jiaheng wang Xiang-Min Meng Jingang Qi Haibo Li Bingsen Zhang wei Zhang weitao Zheng Key laboratory of Automobile materials MOE School of Materials Science & Engineering Electron Microscopy Center International Center of Future Science Jilin University shenyang national laboratory for materials science Institute of Metal Research Chinese Academy of Sciences department of Mechanical engineering Hefei University of Technology Key laboratory of Functional materials Physics and Chemistry of the Ministry of Education Jilin Normal University Key laboratory of Photochemical Conversion and Optoelectronic materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences School of Material science & engineering Liaoning University of Technology

MXene has shown distinctive advantages as anode materials of lithium-ion batteries. However, local surface chemistry, which was confirmed that can block ion transfer and limit redox reaction, has a significant effect on electrochemical performance. Herein, annealing MXene under hydrogen was employed for removing-F and turning-OH to-O terminations. We demonstrate that it improves the kinetics of Li-ion transport between the electrolyte and electrode. As a result, a lower interfacial charge transfer impedance was obtained. The electrochemical measurement exhibited that a nearly 2-fold increase of specific capacity was achieved for the annealed MXene.

关键词： Ti3C2 MXene Li-ion Hydrogen -F content

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Characteristics of the Structure and Properties of ZnSnO3 Films by Varying the Magnetron Sputtering Parameters

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Acta metallurgica Sinica(English Letters) 2016年第9期29卷 827-833页

作者： Fa-Yu Wu Jian-wei Li Yi Qi Wu-Tong Ding Yuan-Yuan Guo Yan-wen Zhou Laser Advanced Manufacturing Technology Center School of Materials and Metallurgy University of Science and Technology Liaoning Anshan 114051 China SINOTRUK (Hong Kong) Limited Jinan Casting and Forging Center Zhangqiu 250200 China School of Material science and engineering Shenyang University of Technology Shenyang 110870 China

Transparent conductive oxide ZnSnO3 films were prepared by radio-frequency magnetron sputtering from powder targets and were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, atomic force microscopy, surface profile, UV-Vis spectroscopy, and Hall effect. The structures of the films were either amorphous or nanocrystalline depending on sputtering parameters including deposition time, target power, chamber pressure, and the target-substrate separation. The average transmittance of the ZnSnO3 films within the visible wavelength was approximately 80% and the resistivity of the ZnSnO3 films was in the range of 10^-3-10^-4 Ω cm. The structural, optical, and electrical properties of the ZnSnO3 films could be adjusted and regulated by optimizing the sputtering process, allowing materials with specific properties to be designed.

关键词： ZnSnO3 film Powder target Magnetron sputtering Optical property Electrical property

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