采用固相反应法制备了CaCu3Ti4O12单相多晶块材,系统地研究了其介电常数与温度(ε(T))和频率(ε(f))的依赖关系.结果表明,CaCu3Ti4O12多晶块材在温度为300 K、频率为1 kHz时,ε高达14000;在1 kHz、100～340 K温区内ε的数值基本不变.CaCu3Ti4O12多晶块材的介电特性很难用位移型铁电体的相关理论描述,可能源于在纳米尺度的畴区内极化弛豫的动态变化.在1 kHz交流电场作用下,温度低于100 K时,CaCu3Ti4O12多晶块材ε的急剧下降与其中氧空位引起Ti离子变价所产生的极化子的热激活相关.
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