Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Electrical Properties of $(x)BaTiO_3-(1-x)SrTiO_3$ Ceramic with Variation of $SrTiO_3$ Substitution

$SrTiO_3$ 고용에 따른 $(x)BaTiO_3-(1-x)SrTiO_3$ 세라믹의 전기적 특성

  • Jang, Dong-Hwan (Dept. of Electrical Engineering, Chonnam National University) ;
  • Ki, Hyun-Chul (Dept. of Electrical Engineering, Chonnam National University) ;
  • Hong, Hyung-Jin (Dept. of Electrical Engineering, Chonnam National University) ;
  • Jung, Woo-Sung (Dept. of Electrical Engineering, Chonnam National University) ;
  • Kim, Tae-Sung (Dept. of Electrical Engineering, Chonnam National University)
  • Published : 1998.11.28
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Abstract

A $BaTiO_3$, ferroelectric material, was mixed $SrTiO_3$, $(x)BaTiO_3-(1-x)SrTiO_3$($0.7{\leq}x{\leq}1$) ceramic capacitor with stable electrical properties in high voltage was fabricated. And microstructure, electrical property were investigated with $SrTiO_3$ mol ratio. The shrinkage, open porosity, sintering density were predominated at $9BaTiO_3-0.1SrTiO_3$. Increasing $SrTiO_3$ mol ratio, curie temperature was shifted at low temperature and maximum permittivity was increased. Also, $0.9BaTiO_3-0.1SrTiO_3$ was showed stable dielectric properties at $25{\sim}80[^{\circ}C]$. V-I properties of specimen were observed in the temperature range of $21{\sim}143[^{\circ}C]$, were divided into three regions. The region I below 10[kV/cm] was shown Ohmic conduction, the region II from 10 to 30[kV/cm] was explained by the Poole-Frenkel emission theory and the region III above 30[kV/cm] was analysed by the tunneling effect.

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