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Effects of Glass Frit Addition on Microstructures and Dielectric Properties of Sintered BaTiO3 Ceramics

Glass Frit의 첨가에 따른 BaTiO3 소결체의 유전 특성 및 미세구조 변화

  • 우덕현 (충주대학교 신소재공학과, 친환경에너지 부품.소재센터) ;
  • 윤만순 (충주대학교 신소재공학과, 친환경에너지 부품.소재센터) ;
  • 손용호 ((주)CQV) ;
  • 류성림 (충주대학교 신소재공학과, 친환경에너지 부품.소재센터) ;
  • 어순철 (충주대학교 신소재공학과, 친환경에너지 부품.소재센터) ;
  • 권순용 (충주대학교 신소재공학과, 친환경에너지 부품.소재센터)
  • Published : 2010.03.01

Abstract

$BaTiO_3$ dielectric ceramics are widely used to multi-layer ceramic capacitor. The $BaTiO_3$ powder was synthesized at $950^{\circ}C$ by using a solid state reaction and grinded by using a high-energy mill. And then, 2.53 wt% glass frit was added to the synthesized $BaTiO_3$ powders for lowering the sintering temperature. The mixed powders were sintered at various temperatures of $1170^{\circ}C$, $1200^{\circ}C$, $1230^{\circ}C$. Microstructures of the sintered $BaTiO_3$ ceramics were inspected by SEM and crystal structures were analyzed by XRD method. The relative dielectric constant was measured by using a impedance/gain phase analyzer. The synthesized $BaTiO_3$ powder had the tetragonal perovskite structure without secondary phase and the particle size was below 200 nm. The relative densities measured at the samples sintered at the temperature above $1200^{\circ}C$ were about 95%. The relative dielectric constant showed maximum value of 2310, which was measured in the specimen sintered at $1200^{\circ}C$. From these results, we could know that the added glass frit had effects on both lowering the sintering temperature and improving the dielectric property.

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