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Electrical property of 8-mol% yttria-stabilized zirconia electrolyte by spark-plasma sintering

science china({2.nological sciences) 2004年第5期47卷 569-576页

作者： JIAN Jiawen1,2. CHANG Aimin3, YANG Bangchao2.& ZHANG Yikang4 1. The school of Information science Engineering, Ningbo {2., Ningbo 3152.1, china 2. the school of microelectronics and solid-state electronics, university of electronic science and tech-nology of china, chengdu 610054, china 3. The Xinjiang technical Institute of Physics and Chemistry, Chinese Academy of sciences, Urumqi 83002., china 4. Hongtak (chengdu) {12. Co., Ltd, chengdu 610041, china Correspondence should be addressed to Jian Jiawen 1. The school of Information science Engineering Ningbo University 315211 Ningbo China 2. the school of microelectronics and solid-state electronics University of Electronic Science and Technology of China 610054 Chengdu China 3. The Xinjiang technical Institute of Physics and Chemistry Chinese Academy of Sciences 830022 Urumqi China 4. Hongtak (chengdu) electronic Co. Ltd 610041 Chengdu China

Spark-plasma sintering (SPS) process was used to sinter ZrO2.(8Y) powders, and a relative density of 99% has been reached at a low temperature (1350°C) and short dwelling time (10 min) compared to the conventional sintered identical samples (1450°C 4 h)(CS). By the X-ray diffraction (XRD) patterns, the microstructure of the SPS pellet and CS pellet are both indexed by the cubic unit cell (Fm3m). The finer crystallite size (D111) of the SPS pellet is 154 nm and D111 of the CS pellet is more than 1 μm. The AC impedance spectroscopy shows that the ionic conductivity of SPS pellet is different from that of CS pellet. The activation energy for the SPS ceramics, estimated from the slope in the range of 400–800°C, was 91 kJ mol?1, which is in good agreement with CS pellet (96 kJ mol?1), indicating that the conduction mechanism in SPS ceramics is similar to that in CS ceramics.

关键词： yttria-stabilized zirconia electrolyte, spark-plasma sintering, AC impedance.

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Microwave Hydrothermal Synthesis PZT of Nanometer Crystal

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Journal of Materials science & tech{2. 2004年第5期20卷 637-638页

作者： Hongxing LIU, Hong DENG, Yan LI and Yanrong LIInstitute of microelectronics and solid {2. electronics, university of electronic science and technology of china, chengdu 610054, china Inst. of microelectronics Univ. of Electron. Sci. and Technol. Chengdu 610054 China

It was focused on the applications and developments of microwave hydrothermal synthesis piezoelectric ceramic powder. The microwave hydrothermal vessel was designed and manufactured. The microwave hydrothermal synthesis system was established and the PZT piezoelectric ceramic powder was synthesized. XRD and TEM have been used to characterize the products in detail. The diameter of the PZT powder particle is from 40 to 60 nm.

关键词： Microwave hydrothermal synthesis Reaction vessel PZT

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Influences of Sputtering Angles and Annealing Temperatures on the Magnetic and Magnetostrictive Performances of TbFe Films

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Journal of Materials science & tech{2. 2005年第3期21卷 315-318页

作者： Hongchuan JIANG, Wanli ZHANG, Wenxu ZHANG, Shiqing YANG and Huaiwu ZHANG College of microelectronics and solid {2. electronics, university of electronic science and technology of china, chengdu 610054, china College of microelectronics and solid {2. electronics University of Electronic Science and Technology of China Chengdu 610054 China

To increase the low-field magnetostriction of TbFe films, the influences of sputtering angles and annealing temperatures on its magnetic and magnetostrictive performances were systematically investigated. With the change in sputtering angles from 90° to 15°, the in-plane magnetization of TbFe films, at 1600 kA·m-1 external field, is strongly increased. An enhancement in the in-plane magnetostrictive coefficient of the films at 40 kA·m-1 is also observed. A detection of magnetic domains by MFM (magnetic force microscopy) indicates that the easy magnetization direction shifts gradually from perpendicular to parallel to the film plane with decreasing sputtering angles. Annealing can enhance the magnetization and magnetostriction of the TbFe films. However, at too high annealing temperature, both the magnetization and magnetostriction of the TbFe films were suppressed to some extent.

关键词： TbFe films Oblique sputtering Annealing Magnetization Magnetostriction

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Study on ChemFET NO2.Gas Sensor Array

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稀有金属材料与工程 2006年第S3期 104-105页

作者： Guangzhong Xie~1 Junsheng Yu~1 Huilin Tai~1 Wusheng Suo~1 Yadong Jiang~1 Bangchao Yang~2.(1.school of Optoelectronic Information,{2. of electronic science & technology of china,chengdu 610054,china) (2.school of {12. and solid-state electronics,{2. of electronic science & technology of china,chengdu 610054,china)

Based on conventional metal-oxide-semiconductor field-effect transistor （MOSFET）,a novel kind of chemical field-effect transistor （ChemFET） gas sensor array has been designed and *** obtained sensor consists of self-assembly polyaniline （PAN） composite film containing poly（acrylic acid）（PAA） which was used as gate material of MOSFET instead of conventional metallic *** UV-Vis absorption spectra of PAN/PAA films were *** NO2.as sensitive property of the ChemFET sensor array was also *** show that the drain current of devices increases with increasing of back-side voltage,and decreases with the increase of NO2.oncentration when the NO2.oncentration is below 2.μg/*** temperature dependence of ChemFET sensor array shows that the drain current of ChemFET sensor decreases with increasing of temperature.

关键词： NO2.sensitivity ChemFET sensor self-assembly polyaniline poly (acrylic acid)

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Theoretical study of ZnO adsorption and bonding on Al_2._3(0001) surface

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science china(Physics,Mechanics & Astronomy) 2004年第6期47卷 664-675页

作者： LI Yanrong1,YANG Chun1,2.XUE Weidong1,LI Jinshan3 & LIU Yonghua3 1.Institute of microelectronics and solid {2. electronics,university of electronic science and technol- ogy of china,chengdu 610054,china 2.Institute of Mathematics and Software science,Sichuan Normal university,chengdu 610068,china 3.Institute of Chemical Materials,china Academy of Engineering Physics,Mianyang 62.000,china Institute of microelectronics and solid {2. electronics University of Electronic Science and Technology of China Chengdu 610054 China Institute of Mathematics and Software science Sichuan Normal University Chengdu 610068 China Institute of Chemical Materials China Academy of Engineering Physics Mianyang 621000 China

ZnO adsorption on sapphire (0001) surface is theoretically calculated by using a plane wave ultrasoft pseudo-potential method based on ab initio molecular dynamics. The results reveal that the surface relaxation in the first layer Al-O is reduced, even eliminated after the surface adsorption of ZnO, and the chemical bonding energy is 434.3(±38.6) kJ·mol?1. The chemical bond of ZnO (0.185 ± 0.01 nm) has a 30° angle away from the adjacent Al-O bond, and the stable chemical adsorption position of the Zn is deflected from the surface O-hexagonal symmetry with an angle of about 30°. The analysis of the atomic populations, density of state and bonding electronic density before and after the adsorption indicates that the chemical bond formed by the O2.of the ZnO ? and the surface Al3+ has a strong ionic bonding characteristic, while the chemical bond formed by the Zn2. and the surface O2.has an obvious covalent characteristic, which ? comes mainly from the hybridization of the Zn 4s and the O 2. and partially from that of the Zn 3d and the O 2..

关键词： α-Al2.3 (0001) ZnO ab initio molecular dynamics chemical adsorption density of states

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NDT techniques Using Barkhausen Effect and Its New Development in Industrial Applications

NDT Techniques Using Barkhausen Effect and Its New Developme...

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ICEMI'2.05第七届国际电子测量与仪器学术会议

作者： Han Mangui (school of microelectronics and {2. state electronics university of electronic science & technology of china chengdu Sichuan {12. china)

Barkhausen effect is a phenomenon, which is caused by a series of irreversible magnetization process, such as domain walls passing through pinning sites in ferromagnetic materials. In a magnetization

关键词： Non destructive test barkhausen effect ferroma- gnetic materials.

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(CoFe)_(1-x)Ag_x颗粒巨磁电阻薄膜的磁折射效应研究

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物理学报 2004年第5期53卷 1520-1523页

作者：钟智勇刘爽张怀武石玉电子科技大学微电子与固体电子学院成都610054 电子科技大学光电信息学院成都610054

在线非接触测试巨磁电阻效应对磁电子器件的工业化生产具有重要的意义 .用红外光谱研究了 (CoFe) 1 -xAgx颗粒薄膜的磁折射效应 ,研究表明在红外波段 ,一级近似可以认为巨磁电阻比值与磁折射变化率成正比 ,可以利用磁折射效应作为在线... 详细信息

在线非接触测试巨磁电阻效应对磁电子器件的工业化生产具有重要的意义 .用红外光谱研究了 (CoFe) 1 -xAgx颗粒薄膜的磁折射效应 ,研究表明在红外波段 ,一级近似可以认为巨磁电阻比值与磁折射变化率成正比 ,可以利用磁折射效应作为在线非接触工具测量与自旋散射相关的巨磁电阻效应 .

关键词：巨磁电阻效应磁折射效应颗粒磁性薄膜红外光谱分析自旋散射

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DFT study of the conductance of molecular wire:The effect of coupling geometry and intermolecular interaction on the transport properties

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science china Chemistry 2006年第6期49卷 492-498页

作者： QI Yuanhua1,2. GUAN Daren1 & LIU Chengbu1 1. Institute of Theoretical Chemistry, Shandong university, Jinan 2.0100, china 2. {2. of Physics and microelectronics, Shandong university, Jinan 2.0061, china 1. Institute of Theoretical Chemistry Shandong University Jinan 250100 China 2. school of Physics and microelectronics Shandong University Jinan 250061 China

The density functional theory (DFT) combining with the non-equilibrium Green functions (NEGF) method is applied to the study of the electronic transport properties for a Di-thiol-benzene (DTB) molecule coupled to two Au(111) surfaces. The dependence of the transport properties on the bias, the coupling geometry of the molecule-electrode interface, and the intermolecular interaction are examined in detail. The results show that the existence of the hydrogen atom at the end of the DTB molecule would significantly decrease the transmission coefficients, and then the differential conductance (dI/dV). By changing the position of the DTB molecule located between two electrodes a maximum value of calculated current is observed. It is also found that the intermolecular interaction will strongly influence the transport properties of the system studied.

关键词： non-equilibrium Green functions method, transmission spectrum, the molecular projected selfconsistent Hamiltonian, projected density of state.

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第一性原理研究BaTiO_3(001)表面的电子结构

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物理学报 2008年第7期57卷 4434-4440页

作者：倪建刚刘诺杨果来张曦电子科技大学微电子与固体电子学院成都610054

在密度泛函理论的基础上,采用平面波赝势方法计算了立方相BaTiO3(001)表面的电子结构.结构优化表明最表层原子都向体内弛豫,且金属原子弛豫幅度最大,同时各层层间距变化呈交错分布.对两种表面结构的总能计算发现TiO2.面稳定性比BaO表面... 详细信息

在密度泛函理论的基础上,采用平面波赝势方法计算了立方相BaTiO3(001)表面的电子结构.结构优化表明最表层原子都向体内弛豫,且金属原子弛豫幅度最大,同时各层层间距变化呈交错分布.对两种表面结构的总能计算发现TiO2.面稳定性比BaO表面弱,一方面是由于TiO2.面结构中存在O-2.表面态,使价带和导带中电子态向高能区域偏移.另一方面,TO2.面附近Ti—O共价键存在强弱差异,有利于发生表面吸附.而在BaO表面结构中,最表层BaO的存在消除了这种差异,因而其表面稳定性较强.

关键词：第一性原理钛酸钡电子结构表面能

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A Current Sensing technique For a Dual Step-up dc-dc converter

A Current Sensing Technique For a Dual Step-up dc-dc convert...

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四川省电子学会半导体与集成技术专委会2.06年度学术年会

作者： LU Yang, ZHANG Bo school of microelectronics and {2.-state electronics, university of electronic science and technology, chengdu 610054

A current sensing technique, which includes ISENSE generator circuit and current limit circuit, is presented for a dual step-up dc-dc converter in this paper. The proposed current sensing circuit doesn’t need an op amp as a voltage mirror, and thus fewer transistors are need and lower power consumption is achieved. We used the BCD (Bipolar, CMOS and DMOS) 0.6um process to design and simulate the converter circuits. The current-sensing accuracy is higher than 90%.

关键词： current sensing current limit dc-dc converter

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