Complex Impedance Analysis of Nb-Doped Barium Titanate Ceramics

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J. Korean Ceram. Soc. > Volume 31(9); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(9): 1012.

Nb이 첨가된 $BaTiO_3$ 세라믹스의 복소 임피던스 해석

조경호, 남효덕, 이희영¹

영남대학교 전자공학과
¹영남대학교 무기재료공학과

Complex Impedance Analysis of Nb-Doped Barium Titanate Ceramics

ABSTRACT

BaTiO3 ceramics doped with 0.1 to 4.0 mol% Nb2O5 were prepared by conventional solid stage sintering process, so as to investigate the effect of the amount of Nb2O5 on the dielectric properties and complex impedance patterns of barium titanates. From the measurement of capacitance, we found that the dielectric constant of BaTiO3 samples with 1 mol% or more Nb2O5 remained approximately constant around room temperature with values higher than 2500. In this paper, the effect of impurity content as well as temperature on complex impedance patterns was discussed in detail. In particular, the grain and grain boundary behavior of samples which showed PTCR characteristics was discussed in terms of measuring temperature.