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Electrochemical properties of LiNi_(0.5)Mn_(1.3)Ti_(0.2)O_4/Li_4Ti_5O_(12)cells

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International Journal of Minerals,Metallurgy and Materials 2012年第5期19卷 457-460页

作者： Guo-qiang Liu Xi Wang Ya-jie Gao Lei Wen Guang-yin Liu Jian-jie Zheng Peng Cen Ying Li School of Materials and Metallurgy Northeastern University Shenyang 110004 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Spinel compounds LiNi0.5Mn1.3Ti0.2O4（LNMTO） and Li4Ti5O12 （LTO） were synthesized by different methods. The particle sizes of LNMTO and LTO are 0.5-2 and 0.5-0.8 μm, respectively. The LNMTO/LTO cell exhibits better electrochemical properties at both a low current rate of 0.2C and a high current rate of 1C. When the specific capacity was determined based on the mass of the LNMTO cathode, the LNMTO/LTO cell delivered 137 mA.h.g-1 at 0.2C and 118.2 mA-h-g-l at 1C, and the corresponding capacity retentions after 30 cycles are 88.5% and 92.4%, respectively.

关键词： lithium batteries titanium compounds nickel compounds manganese compounds oxides electrochemical properties

TixSb2Te Thin Films for Phase Change Memory Applications

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Chinese Physics Letters 2014年第7期31卷 222-225页

作者：唐时宇李润欧欣许含霓夏奕东殷江刘治国 Department of Materials Science and Engineering and National Laboratory of Solid State Microstructures Nanjing University Nanjing 210093 Department of Physics and National Laboratory of Solid State Mierostructures Nanjing University Nanjing 210093

Sb2 Te films with different Ti contents （TixSb2 Te） are derived via the target-attachment method by using the magnetron sputtering technique. The effects of the Ti content on the phase change characteristics and the microstructures are investigated by x-ray diffraction, x-ray photoelectron spectroscopy, scanning electron microscopy and atom force microcopy. Resistance-temperature measurements are carried out to reveal the enhanced crystallization temperature of TixSb2 Te films, indicating a better thermal stability in such films. Both the activation energy and the temperature for 10 y data retention increase with increasing the concentration of Ti. It indicates that the crystallization of the amorphous Sb2 Te film could be suppressed by the introduction of Ti. The improvement of crystallization temperature and the thermal stability of the amorphous Sb2 Te film results from the introduction of Ti in Sb- Te bond that decreases the binding energy of Sb 4d and Te 4d.

关键词： titanium compounds METALLIC films PHASE change memory MAGNETRON sputtering METALS -- Microstructure METALS -- Thermal properties

Grain-Size Effect on the Dielectric Properties of Bi0.5Na0.5TiO3

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Chinese Physics Letters 2003年第2期20卷 290-292页

作者： ZHAO Ming-Lei WANG Chun-Lei ZHONG Wei-Lie State Key Laboratory of Crystal Materials School of Physics and Microelectronics Shandong University

We prepared bismuth sodium titanate (Bi0.5Na0.5TiO3) ultrafine powders by the sol-gel method. The dielectric properties of the pressed pellets and fired ceramics with different grain sizes as a function of temperature at various frequencies were studied. With the decrease of grain size, the dielectric anomaly around 200°C increases, while the dielectric thermal hysteresis decreases. All the samples with grain sizes larger than 100 nm show dielectric peaks at temperature of about 350°C. The very little change in Tm observed down to the critical size indicates that Bi0.5Na0.5TiO3 is an order-disorder system above 200°C. In addition, the dielectric peak becomes lower with the decrease of grain size and the ferroelectric critical size of Bi0.5Na0.5TiO3 was eventually determined to be about 100 nm according to the disappearance of dielectric peak.

关键词： titanium compounds

Effect of Silane Flow Rate on Structure and Corrosion Resistance of Ti-Si-N Thin Films Deposited by a Hybrid Cathodic Arc and Chemical Vapour Process

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Chinese Physics Letters 2008年第11期25卷 4072-4075页

作者：尹龙承栾森吕国华王兴权黄骏金辉冯克成杨思泽 College of Science Changchun University of Science and Technology Changchun 130022 Institute of Physic Chinese Academy of Sciences Beijing 100080

Ti-Si-N thin flms with different silicon contents are deposited by a cathodic arc technique in an Ar＋N2＋SiH4 mixture atmosphere. With the increase of silane flow rate, the content of silicon in the Ti-Si-N films varies from 2.0 at. % to 12.2 at. %. Meanwhile, the cross-sectional morphology of these films changes from an apparent columnar microstructure to a dense fine-grained structure. The x-ray diffractometer （XRD） and x-ray photoelectron spectroscopy （XPS） results show that the Ti-Si-N film consists of TiN crystallites and SiNx amorphous phase. The corrosion resistance is improved with the increase of silane flow rate. Growth defects in the films produced play a key role in the corrosion process, especially for the local corrosion. The porosity of the films decreases from 0.13%to 0.00032% by introducing silane at the flow rate of 14sccm.

关键词： THIN films titanium compounds SILICON compounds NITRIDES SILANE FLUID dynamics CORROSION & anti-corrosives

Optical focusing feature of single element in 128×128 elements electrically controllable cylindrical liquid crystal lens array

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Chinese Optics Letters 2010年第3期8卷 329-331页

作者：李晖刘侃张新宇张天序沈绪榜 Institute for Pattern Recognition and Artificial IntelligenceHuazhong University of Science and Technology National Laboratory for Multi-Spectral Information Processing Technology Huazhong University of Science and Technology Wuhan National Laboratory for Optoelectronics

A 128× 128 elements cylindrical liquid crystal （LC） lens array with electrically controllable focal length is proposed. The cylindrical LC lens array uses transparent indium tin oxide （ITO） films as electrode, avoiding to affect the optical path operating in the voltage-off status. As the top electrode of the cylindrical LC lens array contacts with LC, the operation voltage root-mean-square （RMS） amplitude can be as low as 1.4 V and the response time is about 20-30 ms. The special optical focusing feature of the cylindrical LC lens array is got. And the focal length of this array is about 60-450 μm.

关键词： Focusing ITO glass Liquid crystals Oxide films Tin titanium compounds

Mode Transition of Vacuum Arc Discharge and Its Effect on Ion Current

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Chinese Physics Letters 2014年第10期31卷 82-84页

作者：蓝朝晖龙继东郑乐 (彭宇飞李杰杨振董攀 Institute of Fluid Physics China Academy of Engineering Physics Mianyang 621900

The mode transition of a pulsed vacuum arc discharge, which is from vacuum surface flashover to non-surface vacuum breakdown or vice versa, is studied by simply adjusting a trigger resistor. This approach provides a possibility to research the transition discharge process. Since the transition process is smooth and controllable, the transition mechanism and its effect on the performance of an ion source can be investigated via various diagnosis experiments. The experimental results show that the mode transition occurs when the resistance is in the range of 0- 10Ω. With the mode transition from surface flashover to non-surface vacuum breakdown, the vacuum arc discharge becomes more intense and the ion current produced by the Ti cathode ion source increases by two times. The related physical mechanism is also discussed in detail.

关键词： VACUUM arcs ELECTRIC arc TRANSITION metal ions ELECTRIC resistors FLASHOVER titanium compounds ELECTRIC resistance EXPERIMENTAL design

PRECIPITATION AND MICROSTRUCTURE OF Cr MODIFIED Al_3Ti

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Acta Metallurgica Sinica(English Letters) 2001年第1期14卷 13-20页

作者： W.H. Tian and M. Nemoto (Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China Sasebo National College of Technology, Okishin 1-1, Sasebo 857-1193, Japan) Dept. of Mat. Phys. Univ. of Sci. and Technol. Beijing Beijing 100083 China

The microstructures of Cr modified Al3Ti containing Al2Ti and L10-AlTi precipitates have been investigated in terms of transmission electron microscopy(TEM). Fine precipitation of Al2Ti (Ga2Hf type structure) and Ll0-AlTi(Cr) occurs in Ll2-Al3Ti(Cr) by aging around 973K. The aging behavior was investigated by microhardness measurements. TEM observations reveal that plate-like Al2Ti precipitates lie on{100} planes of the Ll2-Al3Ti(Cr) matrix with the c axis of the tetragonal phase perpendicular to the thin plate. As contrast with Al2Ti precipitates, Ll0-AlTi(Cr) precipitates form thin plate and lie on {100} planes of Ll2-Al3Ti(Cr) matrix at the initial aging time and for long time aging the habit plane of the thin plate deviates from {100} plane and finally forms a kinked plate. The coherency stresses across the precipitate/matrix interface are considered to be the main factors controlling the precipitate morphology.

关键词： Age hardening Aluminum compounds Microstructure Precipitation (chemical) titanium compounds

Formation Conditions of TiN Coatings by Reactive Magnetron Sputtering and Its Characteristics

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Rare Metals 1989年第4期9卷 32-37页

作者： Zhang, Xuehua Cheng, Shide Chen, Guanwu Wang, Donghui General Research Inst for Non-ferrous Metals China

The TiN coatings on the surfaces of various cemented carbides were performed by use of reactive magnetron sputtering. The highest microhardness which was obtained in our experiment was 49 GPa. The order of effects of deposition parameters is resulted from the L16 experiments according to orthogonal design. The pole density analysis indicated that there were a few of the textureless samples. The crystal orientation of TiN exhibited clear regularity and affected microhardness and other properties of films remarkably. A concept relating to structure factor was proposed. A layer-like structure was found. SAES showed that a transition layer exists between substrate and coating and its thickness is of a micron. The formation mechanism of film was discussed.

关键词： Cutting Tools Carbide Nitrides Sputtering Protective Coatings Quality Control titanium compounds Sputtering

Microstructure and Mechanical Properties of Ti3SiC2 Irradiated by Carbon Ions

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Chinese Physics Letters 2014年第7期31卷 64-68页

作者：王坤戚强程贵钧施立群 Applied Ion Beam Physics Laboratory Institute of Modern Physics Fudan University Shanghai 200433 Department of Nuclear Science and Technology Fudan University Shanghai 200433

Thanks to its noteworthy mechanical properties, excellent damage tolerance and good thermal stability, the Ti3SiC2 ternary compound has attracted great concern and has been considered as a potential structural component material for the 4th generation of reactors （e.g., gas fast nuclear reactors） and future fusion reactors. The outstanding properties are due to the nanolameIlar structure which imparts characteristics of both metals and ceramics to this material In our work, Ti3SiC2 samples have been irradiated by C^＋ ions with a high fluence of 1.78 × 10^17 ions/cm^2 at a range of temperatures from 120℃～850℃. Subsequently, series of characterization techniques including synchrotron irradiation x-ray diffraction, scanning electron microscopy and nano-indentation are carried out to understand the changes of microstructure and mechanical properties. The composition exhibits high damage tolerant properties and a high recovery rate through the analysis, especially at high temperature. The minimum damage to an irradiated sample appears around 350℃ in the temperature range 120℃-550℃. At a high irradiation temperature, a significant reduction in the damage can be achieved and an almost complete lack of damage compared with an un-irradiated sample is revealed at the temperature of 850℃.

关键词： SILICON carbide titanium compounds CARBON METALS -- Microstructure METALS -- Mechanical properties