고품질 적층 세라믹 콘덴서 응용을 위한 강유전체 복합 재료연구 = Relaxor/Normal Ferroelectric Composite Ceramic Materials for Multilayer Ceramic Capactors (MLCC)

다국어 초록 (Multilingual Abstract)

The multilayer ceramic capacitors (MLCC) are fast growing as the result of the continuing miniaturization of integrated electronic components. Among ceramic materials, modified BaTiO₃ based ceramics are widely used for MLCC. However, there are still some limitations, such as high firing temperature, strong dependency of DC field, moderate dielectric constant, and an unstable temperature coefficients of capacitance (TCC). One family of materials which have received a large amount attention are the lead based relaxor ferroelectrics due to their super-high dielectric constant, even though they have some disadvantages for MLCC, such as non-stoichiometry structure due to the volatility of lead, strong frequency dependency of dielectric constant, and high dielectric loss. A new approach which has been used to produced a material with temperature stable dielectric characteristics with high dielectric constant is to make composite dielectrics between modified BaTiO₃ and relaxor. In this work, several relaxor-normal ferroelectric composite systems were examed to adopt for MLCC applications. Based on the results, MLCCs produced show low firing temperature, high dielectric constant, CR product, good TCC characteristics, and moderate DC bias saturation, promising candidate materials for miniaturizing MLCC.