| Summary: | 碩士 === 國立成功大學 === 材料科學及工程學系碩博士班 === 95 === An unusual dielectric ceramic material CaCu3Ti4O12 (CCTO) is a cubic perovskite structure. It possesses an extraordinarily high dielectric constant at room temperature of about 104~105. Besides, the dielectric constant is nearly constant over a wide temperature range ~100-600K. However the dielectric constant drops rapidly to 100 below about 100K.
In this study, we would discuss the influence of MnO2 addition and electrode difference on the dielectric behavior and microstructure of CCTO. We can find that manganese doping would decrease the dielectric constant of CCTO. In addition, an equivalent circuit of CaSiO3-CCTO including domain, domain boundary, grain boundary, and electrode contact is proposed.
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