Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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The Electrical Properties of the Laminated PTC Thermistor for Micro Circuit Protection as a Function of Starting Material and Sr Addition

초소형 회로보호용 적층 PTC 써미스터의 출발원료 및 Sr 첨가에 따른 전기적 특성

  • Lee, Mi-Jai (Electronic Materials Laboratory, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Bit-Nan (Electronic Materials Laboratory, Korea Institute of Ceramic Engineering and Technology) ;
  • Hwang, Jong-Hee (Electronic Materials Laboratory, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Jin-Ho (Electronic Materials Laboratory, Korea Institute of Ceramic Engineering and Technology) ;
  • Park, Seong-Chul (Annexed Research Institute, InnoChips Technology) ;
  • Song, Jun-Baek (Annexed Research Institute, InnoChips Technology)
  • 이미재 (한국세라믹기술원 전자광소재센터) ;
  • 김빛남 (한국세라믹기술원 전자광소재센터) ;
  • 황종희 (한국세라믹기술원 전자광소재센터) ;
  • 김진호 (한국세라믹기술원 전자광소재센터) ;
  • 박성철 ((주)이노칩테크놀로지) ;
  • 송준백 ((주)이노칩테크놀로지)
  • Received : 2011.10.11
  • Accepted : 2011.11.14
  • Published : 2011.11.30
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Abstract

We investigated the electrical properties the starting material and sintering condition on the laminated PTC thermistor for micro circuit protection. The influences of $BaTiO_3$ powder with the 0.3 and 0.45 ${\mu}m$ size and the electrical characteristics (Ba,Sr)$TiO_3$ sintered at 1350~1400$^{\circ}C$ for 2 h in a reducing atmosphere (1% $H_2/N_2$). The sintered (Ba,Sr)$TiO_3$ was increased pore and the grain size was decreased according to increasing Sr additions. In relative permittivity, the phase transition temperature of (Ba,Sr)$TiO_3$ was decreased for 2.5$^{\circ}C$ according to increasing 0.01 mole Sr additions, and the phase transition dose not appeared about 0.3 mole Sr addition. The (Ba,Sr)$TiO_3$ was show the low resistance from 0.01 mole to 0.05 mole by Sr addition, regardless of sintering temperature. The (Ba,Sr)$TiO_3$ was show $10^2$ jump order at 0.1 and 0.2 mole Sr addition, and PTCR of the sintered $(Ba_{0.7}Sr_{0.3})TiO_3$ does not appeared about 0.3 mole Sr addition, regardless of the sintering temperature and starting material size.

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References

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