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Molecular Dynamics Simulation of Strontium Titanate

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Chinese Physics Letters 2010年第2期27卷 217-219页

作者： SEETAWAN Tosawat WONG-UD-DEE Gjindara THANACHAYANONT Chanchana AMORNKITBUMRUNG Vittaya Thermoelectrics Research Center and Department of Physics Faculty of Science and Technology Sakon Nakhon Rajabhat University 680 Nithayo Rd. Sakon Nakhon 47000 Thailand National Metal and Materials Technology Center 114 Thailand Science Park Paholyothin Rd. Klong 1 Klong Luang Pathumthani 12120 Thailand Integrated Nanotechnology Research Center and Department of Physics Faculty of Science Khon Kaen University 123 Mitrapab Rd. Khon Kaen 40002 Thailand

The molecular dynamics method is used to simulate the thermophysical properties of SrTiO3 thermoelectric material in the temperature range 300-2200 K. The Morse-type potential functions added to the Busing-Ida type potential for interatomic interaction are used in the simulation. The interatomic potential parameters are determined by fitting to the experimental data of lattice parameters with temperature and the data reported in literature. The linear thermal expansion coefficient, heat capacity and lattice contributions to the thermal conductivity are analyzed. The results agree with the data reported in the literature.

关键词： Condensed matter: electrical magnetic and optical Semiconductors Condensed matter: structural mechanical & thermal

Effect of Vacuum on the Laser-Induced Damage of Anti-Reflection Coatings

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Chinese Physics Letters 2009年第7期26卷 126-129页

作者：凌秀兰赵元安李大伟周明邵建达范正修 Key Laboratory of Material Science and Technology for High Power Lasers Shanghai Institute of Optics and Fine Mechanics Shanghai 201800 Graduate School of Chinese Academy of Sciences Beijing 100049 Department of Information Engineering North University of China Taiyuan 030051

In the comparison of damage modifications, absorption measurement and energy dispersive x-ray analysis, the effect of vacuum on the laser-induced damage of anti-reflection coatings is analyzed. It is found that vacuum decreases the laser-induced damage threshold of the films. The low laser-induced damage threshold in vacuum environments as opposed to air environments is attributed to water absorption and the formation of the O/Si, O/Zr sub-stoichiometry in the course of laser irradiation.

关键词： Optics quantum optics and lasers Condensed matter: structural mechanical & thermal

Formability and thermal Stability of Ce62Al15Fe8Co15 Bulk Metallic Glass

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Chinese Physics Letters 2010年第2期27卷 206-208页

作者：王志新卢金斌杨卫铁 Department of Materials and Chemical Engineering Zhongyuan Institute of Technology Zhengzhou 450007

The formability and thermal stability of Ce62Al15Fe8Co15 bulk metallic glass （BMG） are studied by x-ray diffraction （XRD） and differential scanning calorimetry. The critical diameter of Ce62Al15Fe8Co15 BMG predicted by the parameter γ is about 3.1 mm, which is roughly in agreement with the XRD results. Stability of the BMG is investigated by means of continuous crystallization diagrams obtained from the extension of the Kissinger and Vogel-Fulcher-Tammann （VFT） equations comparatively. It is found that the dependence of crystallization temperature of the BMG on heating rates follows a nonlinear relationship rather than Kissinger and Lasoka＇s linear fittings. The thermal stability of the BMG is investigated by the VFT equation.

关键词： Condensed matter: structural mechanical & thermal

Luminescence Properties of Sr2SnO4：Sm^3＋ Afterglow Phosphor

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Chinese Physics Letters 2010年第3期27卷 258-261页

作者：雷炳富乐松张永哲刘应亮 Department of Physics 3inan University Guangzhou 510632 Department of Chemistry and Nanochemistry Institute Jinan University Guangzhou 510632

A new long-lasting phosphorescence （LLP） phosphor, Sr2SnO4：Sm3＋ which emits reddish-orange LLP upon UV-excitation, is prepared by a conventional high-temperature solid-state method. After irradiation under 247-nm UV light, Sr2SnO4：Sm3＋ emits an intense reddish-orange emission afterglow from the 4G5/2 to 6HJ （J = 5/2,7/2,9/2） transitions. The afterglow decay curve of the Sm3＋-doped Sr2SnO4 phosphor contains a fast decay component and another slow decay one. Due to the presence of the slow decay component, the afterglow can be seen with the naked eye in the dark clearly for more than 1 h after removal of the excitation source.

关键词： Condensed matter: electrical magnetic and optical Condensed matter: structural mechanical & thermal

Room-Temperature Continuous-Wave Operation of InGaN-Based Blue-Violet Laser Diodes with a Lifetime of 15.6 Hours

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Chinese Physics Letters 2010年第11期27卷 129-132页

作者：曾畅张书明季莲王怀兵赵德刚朱建军刘宗顺江德生曹青种明段俐宏王海史永生刘素英杨辉陈良惠 State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences PO Box 912 Beijing 100083 Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of Sciences Suzhou 215123 Nano-Optoelectronics Laboratory Institute of Semiconductors Chinese Academy of Sciences PO BOX 912 Beijing 100083

We report our recent progress of investigations on InGaN-based blue-violet laser diodes （LDs）. The roomtemperature （RT） cw operation lifetime of LDs has extended to longer than 15.6 h. The LD structure was grown on a c-plane free-standing （FS） GaN substrate by metal organic chemical vapor deposition （MOCVD）. The typical threshold current and voltage of LD under RT cw operation are 78 mA and 6.8 V, respectively. The experimental analysis of degradation of LD performances suggests that after aging treatment, the increase of series resistance and threshold current can be mainly attributed to the deterioration of p-type ohmic contact and the decrease of internal quantum efticiency of multiple quantum well （MQW）, respectively.

关键词： Surfaces interfaces and thin films Optics quantum optics and lasers Condensed matter: structural mechanical & thermal

Effect of Temperature on Structural and Magnetic Properties of Laser Ablated Iron Oxide Deposited on Si（100）

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Chinese Physics Letters 2009年第11期26卷 211-214页

作者： Shahid M. Ramay Saadat A. Siddiqi M. Sabieh Anwar S. C. Shin Centre for Solid State Physics University of Punjab Lahore-54590 Pakistan School of Science and Engineering Lahore University of Management Sciences (LUMS) Opposite Sector U D.H.A Lahore 54972 Pakistan Department of Physics KAIST 373-1 Guseong-dong Yuseong-gu Daejeon 305-701 Republic of Korea

We fabricate Fe3O4 thin films on Si（100） substrates at different temperatures using pulsed laser deposition, and study the effect of annealing and deposition temperature on the structural and magnetic properties of Fe3O4 thin films. Subsequently, the films are characterized by x-ray diffraction （XRD）, scanning electron microscopy （SEM） and vibrating sample magnetometery （VSM）. The XRD results of these films confirm the presence of the Fe3O4 phase and show room-temperature ferromagnetism, as observed with VSM. We demonstrate the optimized deposition and annealing conditions for an enhanced magnetization of 854 emu/cm3 that is very high when compared to the bulk sample.

关键词： Condensed matter: electrical magnetic and optical Surfaces interfaces and thin films Condensed matter: structural mechanical & thermal

mechanical Reinforcement and Piezoelectric Properties of PZT Ceramics Embedded with Nano-Crystalline

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Chinese Physics Letters 2010年第4期27卷 215-218页

作者：王大伟金海波袁杰温宝利赵全亮张德庆曹茂盛 School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 School of Information Engineering Central University for Nationalities Beijing 100081 Qiqihar Railway Rolling Stock CO. LTD Qiqihar 161002

The double-scale lead zirconate titanate （PZT） piezoelectric ceramics were prepared by the solid state processing with PZT nano-crystalline and micro-powder. The microstructures, electrical and mechanical properties of the double-scale PZT are investigated. All the sintered ceramics exhibit a single perovskite structure and the grain size of the dou ble-scale PZT reduces due to the incorporation of PZT nano-crystalline. Compared to normal PZT, the mechanical properties increase significantly and the piezoelectric properties decrease slightly. Mechanisms responsible for the reinforcement of the double-scale PZT are discussed.

关键词： Condensed matter: electrical magnetic and optical Nanoscale science and low-D systems Condensed matter: structural mechanical & thermal

Irradiation Effects of Femtosecond Pulses on Refractive Index of Ag-Embedded Nanocomposite Glasses

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Chinese Physics Letters 2010年第2期27卷 288-291页

作者：董志伟钱士雄杨修春陈德应 National Key Laboratory of Tunable Laser Technology Harbin Institute of Technology Harbin 150001 School of Materials Science and Engineering Tongji University Shanghai 200433 Surface Physics Laboratory (National Key Laboratory) and Physics Department Fudan University Shanghai 200433

The irradiation effects of femtosecond pulses on Ag-embedded composite glasses fabricated by ion-exchange are investigated using z-scan measurement. Both changes of the refractive index caused by the laser irradiation effect and the third-order optical nonlinearity are observed in the experiment. Taking the change of the linear and nonlinear refractive index into consideration, the fitting results are in agreement with the experimental results.

关键词： Condensed matter: electrical magnetic and optical Optics quantum optics and lasers Nanoscale science and low-D systems Condensed matter: structural mechanical & thermal

Computerized Control and Operation of Rutherford Backscattering/Channeling for an in situ Ion Beam System and Its Application for Measurement of Si（001） and ZnO（001）

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Chinese Physics Letters 2011年第1期28卷 66-69页

作者： HE Jun J. C. LEE LI Ming WANG Ze-Song LIU Chuan-Sheng FU De-Jun Accelerator Laboratory Wuhan University Wuhan 430072 Quantum-Functional Semiconductor Research Center Dongguk University 3-26 Pildong Seoul 100-715 Korea

A computer-automated Rutherford backscattering/channeling （RBS/C） system is developed to provide in situ ion beam analysis of the accelerator-TEM system in Wuhan University. The basic system components are a PC equipped with a multichannel analyzer data acquisition board, motion control hardware including the Panmure stepping motor controller and integrated circuit modules, and a Labview programmed operating system with associated electronics. Single crystalline Si（001） and ZnO（001） implanted with Mn ions were characterized with this computerized setup. The crystalline quality Xmin and channeling half angle of Si（O01） were measured to be 4.65% and 0.52%, respectively, which are comparable to theoretical values 4.2% and 0.32%. The ion implantation induced damage depth profile derived from channeling and random spectrum is in reasonable agreement with the result calculated by the SRIM Monte-Carlo simulation code.

关键词： Surfaces interfaces and thin films Condensed matter: structural mechanical & thermal