| Effects of barium on the nonlinear electrical characteristics and dielectric properties of SnO2-based varistors |
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| 作者姓名： | 王春明 王矜奉 王春雷 陈洪存 苏文斌 臧国忠 亓鹏 赵明磊 明保全 |
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| 作者单位： | School of Physics and Microelectronics, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;School of Physics and Microelectronics, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;School of Physics and Microelectronics, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;School of Physics and Microelectronics, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;School of Physics and Microelectronics, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;School of Physics and Microelectronics, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;School of Physics and Microelectronics, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;School of Physics and Microelectronics, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;School of Physics and Microelectronics, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China |
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| 基金项目： | Project supported by the Natural Science Foundation of Shandong Province, China (Grant No Z2003F04). |
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| 摘 要： | The effects of barium on electrical and dielectric properties of the SnO_2·Co_2O_3·Ta_2O_5 varistor system sintered at 1250℃ for 60min were investigated. It is found that barium significantly improves the nonlinear properties. The breakdown electrical field increases from 378.0 to 2834.5V/mm, relative dielectric constant (at 1kHz) falls from 1206 to 161 and the resistivity (at 1kHz) rises from 60.3 to 1146.5kΩ·cm with an increase of BaCO_3 concentration from 0mol% to 1.00mol%. The sample with 1.00mol% barium has the best nonlinear electrical property and the highest nonlinear coefficient (α=29.2). A modified defect barrier model is introduced to illustrate the grain-boundary barrier formation of barium-doped SnO_{2}-based varistors.
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| 关 键 词： | 变阻器 锡氧化物 导电性 绝缘性 碳酸钡 |
| 收稿时间： | 2004-03-31 |
Effects of barium on the nonlinear electrical characteristics and dielectric properties of SnO2-based varistors |
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| Wang Chun-Ming,Wang Jin-Feng,Wang Chun-Lei,Chen Hong-Cun,Su Wen-Bin,Zang Guo-Zhong,Qi Peng,Zhao Ming-Lei and Ming Bao-Quan.Effects of barium on the nonlinear electrical characteristics and dielectric properties of SnO2-based varistors[J].Chinese Physics B,2004,13(11):1936-1940. |
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| Authors: | Wang Chun-Ming Wang Jin-Feng Wang Chun-Lei Chen Hong-Cun Su Wen-Bin Zang Guo-Zhong Qi Peng Zhao Ming-Lei and Ming Bao-Quan |
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| Institution: | School of Physics and Microelectronics, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China |
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| Abstract: | The effects of barium on electrical and dielectric properties of the SnO_2·Co_2O_3·Ta_2O_5 varistor system sintered at 1250℃ for 60min were investigated. It is found that barium significantly improves the nonlinear properties. The breakdown electrical field increases from 378.0 to 2834.5V/mm, relative dielectric constant (at 1kHz) falls from 1206 to 161 and the resistivity (at 1kHz) rises from 60.3 to 1146.5kΩ·cm with an increase of BaCO_3 concentration from 0mol% to 1.00mol%. The sample with 1.00mol% barium has the best nonlinear electrical property and the highest nonlinear coefficient (α=29.2). A modified defect barrier model is introduced to illustrate the grain-boundary barrier formation of barium-doped SnO_{2}-based varistors. |
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| Keywords: | varistors tin oxide electrical and dielectric properties barium carbonate |
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