Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Investigation on PTCR Characteristics of (1-x)BaTiO3-x(Bi0.5Na0.5)TiO3 (0.01≤x≤0.10) Ceramics by Modified Synthesis Process

수정합성공정에 의한 무연 (1-x)BaTiO3-x(Bi0.5Na0.5)TiO3 (0.01≤x≤0.10) 세라믹의 PTCR 특성 연구

  • Kim, Kyoung-Bum (Optic and Electronic Ceramics Division, Korea Institute of Ceramic Engineering & Technology) ;
  • Kim, Chang-Il (Optic and Electronic Ceramics Division, Korea Institute of Ceramic Engineering & Technology) ;
  • Jeong, Young-Hun (Optic and Electronic Ceramics Division, Korea Institute of Ceramic Engineering & Technology) ;
  • Lee, Young-Jin (Optic and Electronic Ceramics Division, Korea Institute of Ceramic Engineering & Technology) ;
  • Paik, Jong-Hoo (Optic and Electronic Ceramics Division, Korea Institute of Ceramic Engineering & Technology) ;
  • Lee, Woo-Young (HIEL Corporation) ;
  • Kim, Dae-Joon (HIEL Corporation)
  • 김경범 (한국세라믹기술원 전자부품센터) ;
  • 김창일 (한국세라믹기술원 전자부품센터) ;
  • 정영훈 (한국세라믹기술원 전자부품센터) ;
  • 이영진 (한국세라믹기술원 전자부품센터) ;
  • 백종후 (한국세라믹기술원 전자부품센터) ;
  • 이우영 ((주)하이엘 기술연구소) ;
  • 김대준 ((주)하이엘 기술연구소)
  • Received : 2010.09.01
  • Accepted : 2010.11.02
  • Published : 2010.12.01
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Abstract

$(1-x)BaTiO_3-x(Bi_{0.5}Na_{0.5})TiO_3$ ($0.01{\leq}x{\leq}0.10$) ceramics were fabricated with muffled sintering by a modified synthesis process. Their positive temperature coefficient of resistivity (PTCR) characteristics were investigated systematically. All specimen showed a perovskite structure with a tetragonal symmetry. Both the lattice parameter of a and c axes were slightly decreased with increasing $(Bi_{0.5}Na_{0.5})TiO_3$ (BNT) content. Grain growth was achieved when the incorporated BNT was increased to 6 mol% and the inhibition of grain growth is considered to be due to the appearance of Ba vacancy ($V^{"}_{Ba}$) in the $(1-x)BaTiO_3-x(Bi_{0.5}Na_{0.5})TiO_3$ ($0.08{\leq}x$). With 4 mol% BNT addition, room temperature resistivity decreased to $48 \Omega{\cdot}cm$ and a resistivity jump ($\rho_{max}/\rho_{min}$) was as high as $1.1{\times}10^4$, respectively. Curie temperature was also increased to $171^{\circ}C$ with increasing BNT content.

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References

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