CaCu3Ti4O12(簡稱CCTO)為鈣鈦礦立方晶結構之介電陶瓷材料。此材料在室溫下擁有極高的介電常數，約104~105。目前推斷CaCu3Ti4O12擁有高介電常數的原因為晶粒邊界及晶域邊界的效應，而燒結條件及起始粉末的性質對晶域及晶粒其邊界有極大的影響。
本研究將純CaCu3Ti4O12以CaCO3、CuO、TiO2按照計量比混合後，以固態反應法合成，並添加含有Mn、Si、Ti的混合物(MST)在不同添加量下於不同燒結持溫時間來探討其對介電性質和顯微結構的影響，且利用添加後的效應進一步解釋燒結時間對於CaCu3Ti4O12機制產生的可能原因。

CaCu3Ti4O12(CCTO) is a dielectric ceramic material which has pervoskite structure. This material has ultrahigh dielectric constant (about 104~105) at room temperature, and almost remain constant between 100K~600K. Recently, grain boundary and domain boundary are thought as the origin of such ultrahigh dielectric constant. Sintering conditions and raw materials have great influence on those boundaries.
In this research, We get undoped CaCu3Ti4O12 powder with CaCO3、CuO、TiO2 stoichiometrily by solid state reaction at first. Then doping compounds consist Mn、Si、Ti elements (MST) and discuss it’s effects on dielectric properties and microstructure with different concentrations and sintering times, in addition, the probable mechanisms of those properties in CaCu3Ti4O12.

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