Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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The effects of additions on the PTC characteristics of semiducting $BaTiO_3$ ceramics.

$BaTiO_3$계 Ceramic 반도체의 PTC 특성의 첨가물영향

  • Han, Sung-Jin (Department of Electrical Engineering, Korea University.) ;
  • Kim, Sang-Young (Department of Electrical Engineering, Korea University.) ;
  • Kang, Hee-Bok (Department of Electrical Engineering, Korea University.) ;
  • Sung, Yung-Kwon (Department of Electrical Engineering, Korea University.)
  • 한성진 (고려대학교 전기공학과) ;
  • 김상영 (고려대학교 전기공학과) ;
  • 강희복 (고려대학교 전기공학과) ;
  • 성영권 (고려대학교 전기공학과)
  • Published : 1989.07.21
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Abstract

The semiconducting bodies were prepared by doping the bariume titanate with $Sb_2O_3,Nb_2O_5$and by subsequent sintering in air. The sintered bodies were annealed between $1100^{\circ}C$ and $1250^{\circ}C$ for 30 minutes to 2 hours in air. The resistivity was measured as a function of temperature from $20^{\circ}C$ to $240^{\circ}C$. The anomalous effect in resistivity occurred all of the $Nb_2O_5$ and $Sb_2O_3$doped barium titanate specimens, which were sintered in air atmosphere, and the most effective PTC effect occurred through 1 hour of sintering time at $1350^{\circ}C$ and 30 minute of annealing time at $1200^{\circ}C$. The resistivity - temperature characteristics seem to be intimately related to oxygen adsorption at grain boundaries and also to the thickness of insulating layers formed at grain boundaries during heat treatment.

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