巨电容率CaCu3Ti4O12陶瓷的制备及其晶粒和晶界非线性特性
Preparation of CaCu3Ti4O12 Ceramics with Giant Permittivity and Its Non-Linear I-V Properties in Grains and Grain Boundaries
摘要
本论文采用固相法制备CaCu3Ti4O12（简写为CCTO）陶瓷，研究了添加剂含量及成型工艺对CCTO陶瓷致密度、微观结构及电气性能等方面的影响。 首先分别以Na0.5Bi0.5Cu3Ti4O12（简写为NBCTO）、Bi0.667Cu3Ti4O12（简写为BCTO）为单一添加剂，CuO-TiO2-La2O3（简写为Cu/Ti/La）为复合添加剂，采用干压成型法制备CCTO块体陶瓷。实验结果表明：当NBCTO含量为5%时，陶瓷形成具有明显立方晶粒的单一钙钛矿结构CCTO基陶瓷，此时陶瓷的电容率达到最大值ℰr=696770（1kHz），对应的介电损耗为tanδ=0.526，非线性系... In this thesis, Ceramics CaCu3Ti4O12, i.e., CCTO, were prepared by the conventional solid-state reaction. The effects of forming technique and amount of different dopants on chemical structure, dielectric properties and J-E response of the samples were studied. Firstly, Na0.5Bi0.5Cu3Ti4O12, i.e., NBCTO, and Bi0.667Cu3Ti4O12, i.e., BCTO, were chosen as single additives, respectively, and, CuO-TiO2...