Electrical Properties of $SrTiO_3$-based Ceramics

$SrTiO_3$계 세라믹의 전기적인 특성

  • 김진사 (광운대학교 공대 전기공학과, 신기술연구소) ;
  • 소병문 (이리농공전문대학 전기과) ;
  • 이준웅 (광운대학교 공대 전기공학과, 신기술연구소)
  • Published : 1998.01.01

Abstract

The (Sr$_1$-\ulcorner.Ca\ulcorner)TiO$_3$(0.05 x 0.2) ceramics were fabricated to form semiconducting ceramics by sintering at about 1350[$^{\circ}C$] in a reducing atmosphere($N_2$gas). After being fired in a reducing atmosphere, metal oxides(CuO) was painted on the both surface of the specimens to diffuse to the grain boundary. The capacitance changes slowly and almost linearly in the temperature region of -40~+85[$^{\circ}C$]. The capacitance characteristics appears a stable value within $\pm$10[%]. According to increase of the frequency as a functional of temperature, all specimens used in this study showed the dielectric relaxation, and the relaxation frequency was above 10\ulcorner[Hz]. The capacitance is almost unchanged below about 20[V] but it decrease slowly over 20[V]. The voltage-current characteristics of specimens observed in the temperature range of 25~125[$^{\circ}C$] as the current increased appears that it is due to space charge condensed to interface between grain and grain boundary.

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