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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

Damage Performance of Multilayer Films under Simultaneous Exposure to Multi-Wavelength Pulses

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Chinese Physics Letters 2009年第7期26卷 136-138页

作者：周明赵元安凌秀兰李淑红邵建达范正修 Key Laboratory of Material Science and Technology for High Power Lasers Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 Graduate Universities of Chinese Academy of Sciences Beijing 100049

Laser damage performance of multilayer films with combined irradiation of 1ω and 2ω is studied to probe the damage mechanisms during wavelength division. The laser induced damage thresholds （LIDTs） of the samples are obtained and tested with only 2ω with various energy densities of 1ω. Different 1ω; polarization directions combined with the 2ω case are also investigated. The result suggests that lw can raise the damage probability of multilayer mirrors when two light wavelengths are present simultaneously; the increasing number of sensitive defects for 2ω can be related to the decline of the LIDTs of the multilayer mirrors.

关键词： 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

Inverted Bottom-Emission Organic Light Emitting Diode Using Two n-Doped Layers for the Enhanced Performance

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Chinese Physics Letters 2010年第11期27卷 181-184页

作者：程翠然陈玉焕秦大山全威刘金锁 Institute of Polymer Science and Engineering School of Chemical Engineering Hebei University of Technology Tianjin 300130

We fabricate an inverted bottom-emission organic light emitting diode （IBOLED） employing two n-doped layers, i.e., 5 nm lithium carbonate doped PTCDA （1：2 Li2CO3：PTCDA） with 5 nm Li2CO3 doped BCP （1：4 Li2CO3：BCP） on top, where PTCDA and BCP stand for 3, 4, 9, 10 perylenetetracarboxylic dianhydride and bathcuporine, respectively. Compared to the IBOED using a layer of 10 nm 1：4 Li2CO3：BCP, the one utilizing the two-layer combination of 5 nm 1：2 Li2CO3：PTCDA and 5 nm 1：4 Li2CO3：BCP shows decreasing operation voltage and thereby increasing power efficiency, mainly attributed to the higher electron conductivity of 1：2 Li2CO3：PTCDA than that of 1：4 Li2CO3：BCP. The mechanism of the electron transport through the interface of 1：2 Li2CO3：PTCDA and 1：4 Li2CO3：BCP is also discussed. We provide a simply and effective structure to enhance the current conduction for IBOLEDs.

关键词： Soft matter liquids and polymers Electronics and devices Surfaces interfaces and thin films Optics quantum optics and lasers Condensed matter: structural mechanical & thermal

High-Temperature Raman Investigation on Phase Transition of LBO Crystal

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Chinese Physics Letters 2009年第11期26卷 60-62页

作者：张霞万松明殷绍唐尤静林 School of Materials Engineering Yancheng Institute of Technology Yancheng 224003 Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 Shanghai Enhanced Laboratory of Ferrometallurgy Shanghai University Shanghai 200072

The high-temperature Raman spectroscopy technique is applied to investigate the phase transition of LiBa O5 crystal. The result shows that the crystal is stable in the range of 293-893 K. When the temperature increases up to above 1107K, the phase transition occurs. In the liquid phase, Li2B4O7 crystal precipitates out. Up to 117314, the Li2B4O7 crystal disappears in the melt.

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

Structural and Magnetic Properties of Sm Implanted GaN

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Chinese Physics Letters 2009年第7期26卷 294-296页

作者：姜丽娟王晓亮肖红领王占国冯春张明兰唐健 Novel Materials Laboratory Institute of Semiconductors and Key Laboratory of Semiconductor Materials Science Chinese Academy of Sciences Beijing 100083

The structural and magnetic properties of Sm ion-implanted GaN with different Sm concentrations are investigated. XRD results do not show any peaks associated with second phase formation. Magnetic investigations performed by superconducting quantum interference device reveal ferromagnetic behavior with an ordering tem- perature above room temperature in all the implanted samples, while the effective magnetic moment per Sin obtained from saturation magnetization gives a much higher value than the atomic moment of Sm. These results could be explained by the phenomenological model proposed by Dhar et al. [Phys. Rev. Lett. 94（2005）037205, Phys. Rev. B 72（2005）245203] in terms of a long-range spin polarization of the GaN matrix by the Sm atoms.

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

Phase Transition Behavior of LiCr 0.35 Mn0.65O2 under High Pressure by Electrical Conductivity Measurement

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Chinese Physics Letters 2010年第3期27卷 236-238页

作者：崔晓岩胡廷静韩永昊高春晓彭刚刘才龙吴宝嘉王月刘鲍任万彬李岩苏宁宁邹广田杜菲陈岗 State Key Laboratory for Superhaxd Materials Jilin University Changchun 130012 College of Physics Jilin Normal University Siping 136000 College of Physics Jilin University Changchun 130012

The electrical conductivity of powdered LiCr 0.35 Mn0.65O2 is measured under high pressure up to 26.22 GPa in the temperature range 300-413 K by using a diamond anvil cell. It is found that both conductivity and activation enthalpy change discontinuously at 5.36 GPa and 21.66 GPa. In the pressure range 1.10-5.36 GPa, pressure increases the activation enthalpy and reduces the carrier scattering, which finally leads to the conductivity increase. In the pressure ranges 6.32-21.66 GPa and 22.60-26.22 GPa, the activation enthalpy decreases with pressure increasing, which has a positive contribution to electrical conductivity increase. Two pressure-induced structural phase transitions are found by in-situ x-ray diffraction under high pressure, which results in the discontinuous changes of conductivity and activation enthalpy.

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

Microscopic Characteristics of Damage Evolution in Ultrapure Aluminum under Tensile Loading

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Chinese Physics Letters 2011年第1期28卷 153-155页

作者： QI Mei-Lan ZHONG Sheng FAN Duan LUO Chao HE Hong-Liang School of Science Wuhan University of Technology Wuhan 430070 Laboratory for Shock Wave and Detonation Physics Research Institute of Fluid Physics China Academy of Engineering Physics Mianyang 621900

A series of plate-experiments are carried out to acquire ultrapure aluminum （purity,. 99.999%） samples with damage. Based on the metallographic of all ＂soft-recovered＂ samples, the characteristics of damage evolution and spallation damage mechanism in ultrapure aluminum are analyzed in detail. Results show that the damage will increase regularly with increasing loading＂ strength. Most of voids appear in the grain boundary and grow alone under tensile loading＂ before they coalesce each other to form big irregular voids. These analysis results are helpful to understand the evolution process of ductile metal dynamic fracture and establish the damage evolution model.

关键词： Condensed matter: structural mechanical & thermal

Influence of Post-Annealing Temperature on Properties of Ta-Doped ZnO Transparent Conductive Films

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Chinese Physics Letters 2009年第11期26卷 81-83页

作者：曹峰王一丁殷景志丛梦龙韩良玉 State Key Laboratory on Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Changchun 130012

Ta-doped ZnO transparent conductive films are deposited on glass substrates by rf sputtering at 300℃. The influence of the post-annealing temperature on the structural, morphologic, electrical, and optical properties of the films is investigated by x-ray diffraction, Hall measurement, and optical transmission spectroscopy. The lowest resistivity of 3.5 ×10^-4 Ω·cm is obtained from the film annealed at 400℃in N2. The average optical transmittance of the films is over 90%. The optical bandgap is found to decrease with the increase of the annealing temperature.

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