中国物理B ›› 2004, Vol. 13 ›› Issue (11): 1936-1940.doi: 10.1088/1009-1963/13/11/031

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Effects of barium on the nonlinear electrical characteristics and dielectric properties of SnO2-based varistors

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   

  1. School of Physics and Microelectronics, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
  • 收稿日期:2004-03-31 修回日期:2004-05-14 出版日期:2004-11-20 发布日期:2005-06-20
  • 基金资助:
    Project supported by the Natural Science Foundation of Shandong Province, China (Grant No Z2003F04).

Effects of barium on the nonlinear electrical characteristics and dielectric properties of SnO2-based varistors

Wang Chun-Ming (王春明), Wang Jin-Feng (王矜奉), Wang Chun-Lei (王春雷), Chen Hong-Cun (陈洪存), Su Wen-Bin (苏文斌), Zang Guo-Zhong (臧国忠), Qi Peng (亓鹏), Zhao Ming-Lei (赵明磊), Ming Bao-Quan (明保全)   

  1. School of Physics and Microelectronics, National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
  • Received:2004-03-31 Revised:2004-05-14 Online:2004-11-20 Published:2005-06-20
  • Supported by:
    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.

关键词: varistors, tin oxide, electrical and dielectric properties, barium carbonate

Abstract: The effects of barium on electrical and dielectric properties of the SnO$_2$$\cdot$Co$_2$O$_3$$\cdot$Ta$_2$O$_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 1146.5k$\Omega\cdot$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 ($\alpha=29.2$). A modified defect barrier model is introduced to illustrate the grain-boundary barrier formation of barium-doped SnO$_{2}$-based varistors.

Key words: varistors, tin oxide, electrical and dielectric properties, barium carbonate

中图分类号:  (Permittivity (dielectric function))

  • 77.22.Ch
77.22.Jp (Dielectric breakdown and space-charge effects) 84.32.Ff (Conductors, resistors (including thermistors, varistors, and photoresistors))