Effect of $ZrO_2$Addition on the Microwave Dielectric Properties of BZN-SZN System Ceramics

BZN-SZN계 세라믹스의 마이크로파 유전 특성에 미치는 $ZrO_2$의 영향

  • 윤석규 (성균관대학교 신소재공학과) ;
  • 박우정 (성균관대학교 신소재공학과) ;
  • 양우석 (성균관대학교 신소재공학과) ;
  • 윤대호 (성균관대학교 신소재공학과)
  • Published : 2001.11.01

Abstract

Microwave dielectric properties of Ba(Zn$_{1}$3/Nb$_{2}$3/) $O_3$-Sr(Zn$_{1}$3/Nb$_{2}$3/) $O_3$(BZN-SZN) system were investigated as a function of sintering temperature and Zr $O_2$content. Density was increased and the temperature coefficient of resonant frequency (TCF, $\tau$$_{f}$) decreased with increasing sintering temperature. However dielectric constant (K) and Q$\times$f value did not change markedly with the sintering temperature. For the samples sintered at the same temperature, density, dielectric constant, and Q$\times$f value were increased and TCF was decreased with increasing Zr $O_2$concentration. Especially, the dielectric constant of the sample increased with x and exhibited the maximum value ($\varepsilon$$_{r}$=41) when x=0.6 at 1575$^{\circ}C$ sintered. TCF decreased with x and exhibited the minimum value ($\tau$$_{f}$=+0.8ppm/$^{\circ}C$) when x=1.0..0.

Ba(Zn$_{1}$3/Nb$_{2}$3/) $O_3$-Sr(Zn$_{1}$3/Nb$_{2}$3/) $O_3$계에 대하여 소결 온도 변화와 Zr $O_2$첨가량에 따른 마이크로파 유전특성을 조사하였다. 동일 조성에서 소결 온도가 증가함에 따라 밀도가 향상되고 공진 주파수의 온도계수($ au$$_{f}$)는 감소하는 경향을 보였으나, 유전상수(K)와 품질계수(Q$\times$f)는 커다란 변화가 없었다. 또한 Zr $O_2$첨가량이 증가함에 따라 소결 시편의 밀도가 향상되었고 더불어 유전상수, 품질계수가 증가하는 경향을 보였으며, 공진 주파수의 온도계수가 감소하는 우수한 특성이 나타났다. 특히, 소결온도 1575$^{\circ}C$, 0.6 wt% Zr $O_2$를 첨가했을 때 유전상수가 최대($\varepsilon$$_{r}$=41)로 나타났으며, 공진 주파수의 온도계수는 1.0wt% Zr $O_2$를 첨가했을 때 최소($\tau$$_{f}$=+0.8ppm/$^{\circ}C$)로서 양호한 값을 얻을 수 있었다.었다.

Keywords

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