무연 BaTiO3-(Bi0.5K0.5)TiO3 PTCR 세라믹과 PTCR 특성에 미치는 Nb2O5의 효과

정영훈; 박용준; 이미재; 이영진; 백종후; 최진수; 이우영; Young Hun Jeong; Yong-Jun Park; Mi-Jae Lee,; Young-Jin Lee; Jong-Hoo Paik; Jin-Soo Choi; Woo-Young Lee

Korean Journal of Materials Research, Vol.18, No.9, 475-481, September, 2008

DOI10.3740/MRSK.2008.18.9.475 Export Citation

무연 BaTiO3-(Bi0.5K0.5)TiO3 PTCR 세라믹과 PTCR 특성에 미치는 Nb2O5의 효과

Lead-free BaTiO3-(Bi0.5K0.5)TiO3 PTCR Ceramics and Effects of Nb2O5 on Its PTCR Characteristics

정영훈^†, 박용준, 이미재, 이영진, 백종후, 최진수¹, 이우영¹

요업(세라믹)기술원 전자부품·소재본부
¹(주)하이엘

Young Hun Jeong^†, Yong-Jun Park, Mi-Jae Lee,, Young-Jin Lee, Jong-Hoo Paik, Jin-Soo Choi¹, and Woo-Young Lee¹

Korea Institute of Ceramic Engineering and Technology, 233-5 Gasan-Dong, Guemcheon-Gu, Seoul, 153-801, Korea
¹Hiel Corporation, 396-1, Haewol-li, Soyang-Myeon, Wanju-Kun, Jeonbuk, 565-844, Korea

E-mail:

Positive temperature coefficient of resistivity (PTCR) characteristics of (1-x)BaTiO3-x(Bi0.5K0.5)TiO3 ceramics doped with Nb2O5 were investigated in order to develop the Pb-free PTC thermistor available at high temperatures of > 120oC. The PTCR characteristics appearing in the (Bi0.5Ki0.5)TiO3 (< 5 mol%) incorporated BaTiO3 ceramics, which might be mainly due to Bi+3 ions substituting for Ba+2 sites. The 0.99BaTiO3- 0.01(Bi0.5K0.5)TiO3 ceramics showed good PTCR characteristics of a low resistivity at room temperature (ρr) of 31 Ω · cm, a high ρmax/ρmin ratio of 5.38 × 103, and a high resistivity temperature factor (α) of 17.8%/oC. The addition of Nb2O5 to 0.99BaTiO3-0.01(Bi0.5K0.5)TiO3 ceramics further improved the PTCR characteristics. Especially, 0.025 mol% Nb2O5 doped 0.99BaTiO3-0.01(Bi0.5K0.5)TiO3 ceramics exhibited a significantly increased ρmax/ρmin ratio of 8.7 × 103 and a high α of 18.6%/oC, along with a high Tc of 148oC despite a slightly increased ρr of 39 Ω · cm.

Keywords:PTCR;BaTiO3;Lead-free;(Bi0.5K0.5)TiO3;Nb2O5

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