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Preparation of nanocrystalline BaTiO_3.ceramics

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science China(Technological sciences) 2009年第6期52卷 1730-1734页

作者： DENG XiangYun1,2,LI DeJun1,LI JianBao2,WANG XiaoHui3.& LI LongTu3.1 College of Physics and Electronic information,tianjin Normal university,tianjin 3.03.7,China 2 materials and Chemical Engineering Institute,key laboratory for Hainan Advantage Resources and Applied technology in Chemical Engineering Material of Ministry of Education,Hainan Provincial key laboratory of Research on Utilization of Si-Zr-Ti,Hainan university,Haikou 570228,China 3.Department of materials science and Engineering,Tsinghua university,Beijing 100084,China College of Physics and Electronic information Tianjin Normal University Tianjin 300387 China materials and Chemical Engineering Institute Key Laboratory for Hainan Advantage Resources and Applied Technology in Chemical Engineering Material of Ministry of Education Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Hainan University Haikou 570228 China Department of materials science and Engineering Tsinghua University Beijing 100084 China

The high-dense nanocrystalline BaTiO3.BT)ceramics with grain size smaller than 100nm have been successfully prepared by the two step sintering and the spark plasma sintering(SPS)*** successive transitions in nanograin BT ceramics from rhombohedral to orthorhombic,tetragonal and cubic transitions,similar to those in coarse BT ceramics,were revealed by in-situ temperature dependent Raman *** multiphase coexistence and the diffused phase transition character were demonstrated in the 8nm nanocrystalline BT ceramics.

关键词： nanocrystalline BaTiO3 ceramics preparation microstructure size effect

A study on odd-parity high-lying states of the Sm atom with three-color resonant excitation

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science China(Physics,Mechanics & Astronomy) 2011年第6期54卷 1124-1130页

作者： LI Ming 1,2,DAI ChangJian 1,2 & XIE Jun 1,2 1 key laboratory of Display materials and Photoelectric Devices,Ministry of Education,{3. 3.0191,China 2 School of {3.,{3. university of technology,{3. 3.03.4,China 1. key laboratory of Display materials and Photoelectric Devices Ministry of Education Tianjin 300191 China2. School of Science Tianjin University of Technology Tianjin 300384 China

The odd-parity high-lying states of the Sm atom are investigated systematically by a three-color resonant excitation scheme with two different excitation *** two intermediate states,4f 6 6s7s 7 F 0 and 4f 6 6s7s 7 F 1 are employed for paths I and II,***-seven bound states are detected with paths I and II in the energy range between 44188 and 45515 cm 1,while 64 autoionizing states are found in the energy range from 45528 to 45761 cm *** only the level energies of all observed states,but also the line widths of autoionizing states are *** possible impact of configuration interaction on the line shape of autoionizing states is also *** addition,the total angular momentum is assigned uniquely to most of the states,whereas the information about the relative line intensity of all states is also presented.

关键词： high-lying states odd-parity the Sm atom resonant excitation

Effects of femtosecond laser ablation on the surface morphology and microstructure of a bulk TiCuPdZr glass alloy

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Rare Metals 2009年第3期28卷 272-276页

作者： WANG Hongshui LIANG Chunyong CHEN Xueguang WANG Lei YANG Yang YANG Jianjun ZHU Shengli LI Changyi School of materials science and Engineering Hebei University of Technology Tianjin 300130 China key laboratory of the Ministry of Education of China for Opto-electronic information {3. and {3. Institute of Modem Optics Nankai University Tianjin 300071 China School of materials science and Engineering Tianjin University Tianjin 300072 China Stomatological Hospital Tianjin Medical University Tianjin 300070 China

The effects of femtosecond laser ablation on the surface characteristics and microstructure of a bulk TiCuPdZr glass alloy were investigated. The heat influence zone of femtosecond laser ablated with a laser energy of 100 μJ exhibits a ripple-like feather, while a porous structure appears on the surface of the specimen ablated by a 200 μJ femtosecond laser. The contents of Ti, Zr, and Pd on the ablated surface decrease and that of Cu increases with increasing laser energy. The crystallization process occurs on the glass alloy specimens during femtosecond laser ablation, and the crystallinity of a 100 μJ femtosecond laser-ablated specimen is greater than that of a 200 μJ femtosecond laser-ablated one.

关键词： femtosecond laser bulk glass alloy periodicity crystallization

Large second-order optical nonlinearities of s-triazine derivatives: View from micro molecules to macro crystals

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science China Chemistry 2005年第3期48卷 203-209页

作者： FANG Qi1, LEI Hong2, CUI Yuezhi3. HUANG Zhenli4, XUE Gang1 & YU Wentao1 1. State key laboratory of Crystal materials, Shandong {3., Jinan 250100, China 2. School of {3. science and Engineering, Shandong {3., Jinan 250100, China 3. Department of Chemical Engineering, Light Industry College of Shandong, Jinan 250100, China 4. key laboratory of Biomedical photonics, Ministry of Education, Huazhong {3. of science and technology, Wuhan 43.074, China 1. State key laboratory of Crystal materials Shandong University 250100 Jinan China 2. School of information science and Engineering Shandong University 250100 Jinan China 3. Department of Chemical Engineering Light Industry College of Shandong 250100 Jinan China 4. key laboratory of Biomedical photonics Ministry of Education Huazhong University of Science and Technology 430074 Wuhan China

Three s-triazine derivatives have been synthesized and their structures been de-termined. These are Compound I: 2,4-dimethyl-6-(p-N,N-dimethylaminostyryl)-s-triazine (abbre-viated to NMe-1), Compound II: 2,4-dimethyl-6-(p-N,N-diethylaminostyryl)-s-triazine (to NEt-1), and Compound III: 2-methyl-4,6-bis(p-N,N-dimethylaminostyryl)-s-triazine (NMe-2). NMe-1 and NEt-1 molecules belong to the D-π-A type with a one-dimensional charge-transfer character. NMe-1 crystallizes to centrosymmetric P1 space group, while NEt-1 to non-centrosymmetric polar Cc space group with all of the molecular charge-transfer axes taking the same orientation. Under the irradiation of 1064 nm fundamental laser, NEt-1 powder crystals radiate a 2-order harmonic light with an intensity 46.8 times that of urea. The Λ typed NMe-2 molecule, which has a two-dimensional charge-transfer character, crystallizes to polar P21 space group. Its powder crystals exhibit a 2-order harmonic intensity 46.2 times that of urea. The quantum chemical cal-culations and tensor analyses have been carried out to reveal the dependence of the macro 2-order nonlinear optical (NLO) efficiency on the micro 2-order NLO coefficients (β) and on the crystalline packing styles.

关键词： s-triazine derivatives, synthesis, structure, SHG intensities of crystals, βvalues of molecules.

Influence of reaction temperature on the formation process of ZnO quantum dots and the optical properties

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Optoelectronics Letters 2009年第1期5卷 1-5页

作者：庄晋艳李岚张晓松徐建萍魏军 Insititute of Material Physics Key Laboratory of Display Materials and Photoelectric DevicesMinistry of EducationTianjin Key Laboratory for Optoelectronic Materials and DevicesTianjin University of Technology Insititute of Material Physics Key Laboratory of Display Materials and Photoelectric Devices Ministry of EducationTianjin Key Laboratory for Optoelectronic Materials and DevicesTianjin University of Technology Colloge of information science Tianjin University of Technology Singapore Institute of Manufacturing technology

ZnO quantum dots (QDs)with the sizes of 3.0-5.6 nm are synthesized by solution-phase method at different temperatures. We find that temperature has great influence on the size of ZnO QDs. The growth process is the most sensitive to temperature, and the process is well explained by Lifshitz–Slyozov–Wagner (LSW) model. By photoluminescence (PL) spectra of the quantum dots at different temperatures and reactive time, we come to a conclusion that ultraviolet emission is mainly due to surface defects, and the or...

关键词： Electron mobility Emission spectroscopy Optical properties Semiconducting zinc compounds Surface defects Zinc oxide

STUDY OF LOW-COST SILICON BASED THIN FILM SOLAR CELLS

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STUDY OF LOW-COST SILICON BASED THIN FILM SOLAR CELLS

Influence of modulation ratio on structure and properties of nanoscale ZrB_2/ZrAlN multilayered coatings

2007世界太阳能大会：太阳能与人类居住

作者： Xinhua Geng Jianjun Zhang 1.Institute of Photoelectronics nankai university 2.tianjin key {3. of Photoelectronic Thin Film Devices and {3. 3.key {3. of Optoelectronic information science and {3. Chinese Ministry of Education Weijin Road 94 tianjin 3.0071 China

＜正＞In this paper,we introduce the approaches of cost reduction for silicon-based thin film solar cells in our ***, we show the main works for low-cost solar cells fabrication technology,including the research on narrow band gap materials,high deposition rate and low-cost equipment. Then we present the recent research results on device quality silicon-based materials deposition process for a-Si:H and uc-Si:*** new solar cells efficiency record obtained in our institute will also be ***,a prospect for research,industry and application of silicon-based thin film photovoltaics will be presented.

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science China(Technological sciences) 2010年第3期53卷 772-775页

作者： LI DeJun 1,KANG YuanBin 1,DONG Lei 1,DENG XiangYun 1,LIU Hao 2 &SUN XueLiang 2 1College of Physics and Electronic information science,tianjin Normal {3.,tianjin 3.03.7,China 2 Department of Mechanical&materials Engineering,{3. of Western Ontario,London ON,Canada 1. College of Physics and Electronic information science Tianjin Normal University Tianjin 300387 China2. Department of Mechanical & Materials Engineering University of Western Ontario London ON Canada

ZrB2/ZrAlN multilayered coatings with various modulation ratios(t ZrB2:t ZrAlN)and constant modulation periods were prepared by magnetron sputtering system at room ***,XRD,surface profiler and nano-indenter were employed to investigate the influences of tZ rB 2:tZrAlNon the microstructure and mechanical properties of the *** interfaces and nanoscale multilayered modulation were confirmed by *** multilayer with modulation period of 40 nm and ratio of 3.1 displayed the highest hardness(3..4 GPa)and critical fracture load(76.477 mN)with lower *** polycrystalline structure and multilayered modulate structure were directly responsible for the enhanced mechanical properties.

关键词： ZrB2/ZrAlN multilayered coating magnetron sputtering modulation ratio nanoscale

LD Pumped Nd:YAG/KTP Intracavity Frequency-doubled 1.2 W CW Red Laser

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LD Pumped Nd:YAG/KTP Intracavity Frequency-doubled 1.2 W CW ...

Research on Electric Field Confinement Effect in Silicon LED Fabricated by Standard CMOS technology

photonics Asia 2004;Optics and Lasers

作者： Jianing Zhou1, 2 * Wuqi Wen1, 2 Rui Zhou1, 2 Xin Ding1, 2 Zhiqiang Cai1, 2 Jianquan Yao1, 2, 3.1. College of Precision Instrument and Opto-Electronics Engineering, Institute of laser and Optoelectronics, key Lab. of Laser and Optoelectric information science and {3., Ministry of Education, {3. university, {3., 3.0072, China 2. nankai university-{3. university Joint Research Institute, {3. 3.0072, China 3. State key of Laser {3., Huazhong university of science and {3., Wuhan 43.074, China

This letter reports the CW red laser radiation at 659.5 nm by intracavity frequency doubling a side pumped Nd:YAG laser with a KTP crystal (type II phase match, =59.8°, =0°). The thermal lens effect r

关键词： red laser, LD pumped laser, CW lasers, 659.5nm, intracavity frequency doubling

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Semiconductor photonics and technology 2010年第Z1期 83-86+91页

作者： YANG Guanghua1,2,WANG Wei3.1.Electronic and information School,tianjin university,tianjin 3.0072,CHN 2.information and Communication Inst.,tianjin Polytechnic university,tianjin 3.0160,CHN 3.Institute of Semiconductors of Chinese Academy of sciences,Beijing 100083.CHN)

The wedge-shaped and leaf-type silicon light-emitting devices(LED)are designed and fabricated with the Singapore Chartered Semi Inc.'s dual-gate standard 0.3.μm CMOS *** basic structure of the two devices is N well-P+ junction.P+ area is the wedge-shaped structure,which is embedded in N *** leaf-type silicon LED device is a combination of the three wedge-shaped LED *** main difference between the two devices is their different electrode distribution,which is mainly in order to analyze the application of electric field confinement(EFC).The devices' micrographs were measured with the Olympus IC test *** forward and reverse bias electrical characteristics of the devices were *** measurements of the devices show that the electrode layout is very important when the electric field confinement is applied.

关键词： silicon LED standard CMOS technology electric field confinement effect