에폭시/BaTiO3 복합 내장현 커패시터 필름의 유전상수에 관한 실험값과 이론적 예측값과의 비교
Comparison of Exerimental Values and Theoretical Predictions of the Dielectric Constant of Epoxy/BaTiO3 Composite Embedded Capacitor Films
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초록
폴리머/세라믹 복합체는 유기기판용 내장형 커패시터의 가장 유망한 재료다. 폴리머/세라믹 복합체의 유효유전상수를 예측하는 것은 복합재료의 설계에 있어 매우 중요하다. 본 논문에서는 크기가 다른 5가지 BaTiO3 분말을 이용하여 분말함량에 따른 에폭시/BaTiO3 복합 내장형 커패시터 필름의 유전상수를 측정하였다. 그 측정 결과를 여러 가지 이론식들에 최소자승법을 이용해 fitting하여 폴리머/세라믹 복합체의 유효유전상수를 예측하는데 가장 유용한 식을 찾고 BaTiO3 분말의 유전상수를 추정하고자 하였다. Lichtenecker 식과 Jayasundere-Smith 식이 에폭시/BaTiO3 복합 내장형 커패시터 필름의 유전상수 예측에 유용한 것으로 나타났다. 피팅을 통해 계산된 BaTiO3 분말의 유전상수는 분말의 크기에 따라 100에서 600 사이였는데 이는 다결정 세라믹 BaTiO3의 유전상수보다 작은 값이다.
Abstract
Polymer/ceramic composites are the most promising embedded capacitor material for organic substrates application. Predicting the effective dielectric constant of polymer/ceramic composites is very important for design of composite materials. In this paper, we measured the dielectric constant of epoxy/BaTiO composite embedded capacitor films with various BaTiO particles loading for 5 different sizes BaTiO powders. Experimental data were fitted to several theoretical equations to find the equation useful for the prediction of the effective dielectric constant of polymer/ceramic composites and also to estimate the dielectric constant of BaTiO powders. The Lichtenecker equation and the Jayasundere-Smith equation were useful for the prediction of the effective dielectric constant of epoxy/BaTiO composites. And calculated dielectric constants of the BaTiO powders were in the range of 100 to 600, which were lower than those of BaTiO bulk ceramics.
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