The Korean Journal of Ceramics

The Korean Ceramic Society (한국세라믹학회)
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Electrical Properties of Low Temperature Sintered $SrTiO_3$ Varistor

  • Seon, Ho-Won (Department of Material Science and Engineering, Korea University) ;
  • Kim, Seong-Ho (Department of Material Science and Engineering, Korea University) ;
  • Sahn Nahm (Department of Material Science and Engineering, Korea University) ;
  • Kim, Yoonho (Division of Ceramics, Korea Institute of Science and Technology)
  • Published : 1999.09.01
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Abstract

The effects of $SiO_2$ and MnO addition on the sinterability and the electrical properties of 0.4mol% Nb-doped SrTiO3 varistor were investigated. The $SiO_2$ content was fixed at 0.3mol% and the MnO content varied from 0 to 1.0mol%. With 0.3 mol% $SiO_2$ and 0.3 mol% MnO addition, optimum density was obtained by sintering at $1200^{\circ}C$ without excess liquid phase. Impedance spectroscopy was performed on the sintered specimens with 0.3 mol% $SiO_2$ and various MnO contents. It was found that the resistivities of grains was increased with increasing MnO content. The dielectric constant was measured to be above 50000 in the specimen with 0.3~1.0mol% Mn content. The non-linear coefficient increased substantially with MnO addition, and it varied from 1 to 9 depending on the MnO content.

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