DOI QR코드

DOI QR Code

Effects of Nb2O5 and MnO2 on the PTCR behavior of Lead-free Ba0.99(Bi1/2Na1/2)0.01TiO3 Ceramics

무연 Ba0.99(Bi1/2Na1/2)0.01TiO3 세라믹의 PTCR 특성에 미치는 Nb2O5와 MnO2의 효과

  • 박용준 (고려대학교 신소재공학과) ;
  • 남산 (고려대학교 신소재공학과) ;
  • 이영진 (요업기술원 전자부품팀) ;
  • 정영훈 (요업기술원 전자부품팀) ;
  • 백종후 (요업기술원 전자부품팀) ;
  • 김대준 ((주)하이엘 기술연구소) ;
  • 이우영 ((주)하이엘 기술연구소)
  • Published : 2008.07.01

Abstract

The effects of $Nb_2O_5$ and $MnO_2$ on the positive temperature coefficient of resistivity (PTCR) behavior of lead-free $Ba_{0.99}(Bi_{1/2}Na_{1/2})_{0.01}TiO_3$ (BaBiNT) ceramics were investigated in order to fabricate a PTC thermistor available at high temperature of > $120^{\circ}C$. In particular, 0.05 mol% $Nb_2O_5$ added BaBiNT ceramic, which has significantly increased Curie temperature (Tc) of $160^{\circ}C$, showed good PTCR behavior; low resistivity at room temperature $(\rho_r)$ of $80.1{\Omega}{\cdot}cm$, a high $\rho_{max}/\rho_{min}$ ratio of $5.65{\times}10^3$ and a large resistivity temperature factor (a) of 18.5%/$^{\circ}C$. Furthermore, the improved $\rho_{max}/\rho_{min}$ of $6.48{\times}10^4$ and a of 25.4%/$^{\circ}C$ along with higher $T_c$ of $167^{\circ}C$ despite slightly increased $\rho_r$ of $569{\Omega}{\cdot}cm$, could be obtained for the BaBiNT + 0.05 mol% $Nb_2O_5$ + 0.02 wt% $MnO_2$ ceramic cooled down at a rate of $200^{\circ}C/h$.

References

  1. B. Huybrechts, K. Ishizaki, and M. Takata, 'Review; The positive temperature coefficient of resistivity in barium titanate', J. Mater. Sci., Vol. 30, p. 2463, 1995 https://doi.org/10.1007/BF00362121
  2. H. Ihrig, 'PTC effect in $BaTiO_3$ as a function of doping with 3d elements', J. Am. Ceram. Soc., Vol. 64, No. 10, p. 617, 1981 https://doi.org/10.1111/j.1151-2916.1981.tb10228.x
  3. E. Brzozowski and M. S. Castro, 'Conduction mechanism of barium titanate ceramics', Ceram. Int., Vol. 26, p. 265, 2000 https://doi.org/10.1016/S0272-8842(99)00052-8
  4. M. -H. Lin and H.-Y. Lu, 'Densification retardation in the sintering of $La_2-O_3-doped$ barium titanate ceramic', Mater. Sci. Eng. A, Vol. 323, p. 167, 2002 https://doi.org/10.1016/S0921-5093(01)01356-9
  5. Y. Sasaki, I. Fujii, K. Morii, and T. Matsui, 'Influence of antimony doping on electrical properties of barium titanate $(BaTiO_3)$ thin films', Mater. Lett., Vol. 26, p. 265, 1996 https://doi.org/10.1016/0167-577X(95)00231-6
  6. T. Matsuoka, Y. Matsuo, H. Sasaki, and S. Hayakawa, 'PTCR behavior of $BaTiO_3$ with $Nb_2O_5$ and $MnO_2$ additives', J. Am. Ceram. Soc., Vol. 55, No. 2, p. 108, 1972 https://doi.org/10.1111/j.1151-2916.1972.tb11223.x
  7. D. X. Zhou and S. P. Gong, 'PTC materials and application, The Press of Huazhong University of Science & Technology', Wuhan, China, 1989
  8. T. Takenaka, K. Maruyama, and K. Sakata, '$(Bi_{1/2}Na_{1/2})TiO_3-BaTiO_3$ system for lead-free piezoelectric ceramics', Jpn. J. Appl. Phys., Vol. 30, p. 2236, 1991 https://doi.org/10.1143/JJAP.30.2236
  9. J.-R. Gomah-Pettry, S. Said, P. Marchet, and J.-P. Mercurio, 'Sodium-bismuth titanate based lead-free ferroelectric materials', J. Eur. Ceram. Soc., Vol. 24, p. 1165, 2004 https://doi.org/10.1016/S0955-2219(03)00473-4
  10. L. Gao, Y. Huang, Y. Hu, and H. Du, 'Dielectric and ferroelectric properties of $(1-x)BaTiO_3-xBi_{0.5}Na_{0.5}TiO_3$ ceramics', Ceram. Int., Vol. 33, p. 1041, 2007 https://doi.org/10.1016/j.ceramint.2006.03.006
  11. W. Huo and W. Qu, 'Effects of $Bi_{1/2}Na_{1/2}TiO_3$ on the curie temperature and the PTC effects of $BaTiO_3-based$ positive temperature coefficient ceramics', Sens. Actuators A, Vol. 128, p. 265, 2006 https://doi.org/10.1016/j.sna.2006.01.022
  12. H. T. Langhammer, T. Muller, R. Bottcher, and H.-P. Abicht, 'Crystal structure and related properties of copper-doped barium titanate ceramics', Solid State Sci., Vol. 5, p. 965, 2003 https://doi.org/10.1016/S1293-2558(03)00087-6
  13. D. Y. Wang and K. Umeya, 'Electrical properties of PTC barium titanate', J. Am. Ceram. Soc., Vol. 73, No. 3, p. 669, 1990 https://doi.org/10.1111/j.1151-2916.1990.tb06570.x
  14. S. B. Desu and D. A Payne, 'Comment on 'Interfacial segregation in perovskites : III', microstructure and electrical properties', J. Am. Ceram. Soc., Vol. 73, No. 11, p. 3407, 1990 https://doi.org/10.1111/j.1151-2916.1990.tb06468.x