CaCu_3Ti_4O_(12)陶瓷巨介电常数来源的研究  

Study on the Origin of Giant Dielectric Constant of CaCu_3Ti_4O_(12) Ceramic

作　　者：张家祥[1] 索娜[1] 罗发[2] 

机构地区：[1]郑州铁路职业技术学院,郑州451460 [2]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《电瓷避雷器》2017年第2期90-94,共5页Insulators and Surge Arresters

摘　　要：采用固相反应法在1055~1095℃制备了CaCu_3Ti_4O_(12)电介质陶瓷材料(以下简称CCTO),并研究了不同烧结温度下CCTO陶瓷介电性能的变化,优化出了最佳制备CCTO陶瓷的工艺参数。利用XRD技术研究了不同烧结温度下CCTO陶瓷立方钙钛矿结构的晶格常数的演变过程,通过观察SEM证明了CCTO陶瓷的巨介电常数和晶粒尺寸大小成正比例,最后结合阻抗谱分析技术证明了CCTO陶瓷的低频介电损耗主要由晶界电阻决定,而晶粒电阻的大小直接影响着CCTO陶瓷的巨介电常数,因此推断出CCTO陶瓷的巨介电常数应该起源于晶粒。In this paper, CaCu3Ti4O12 dielectric ceramic materials are prepared in 1055 -1095℃ by solid state reaction method （hereinafter referred to as CCTO）, and to study the changes of dielectric properties of CCTO ceramics sintered at different temperatures, the optimum technological parameters for CCTO ceramic are explored. Study on the evolution of the lattice constant of cubic perovskite structure for CCTO ceramic at different sintering temperatures by using XRD technology, through the observation of SEM proved that CCTO ceramics with giant dielectric constant and the grain size is proportional, finally combining impedance spectrum analysis proves that the low frequency dielectric loss of CCTO ceramics is mainly determined by the grain boundary resistance, and the grain resistance directly affects giant dielectric constant of the CCTO ceramics, so it is inferred that the giant dielectric constant of CCTO ceramics have originated in grain crystal.

关 键 词：CCTO 烧结温度 巨介电常数 起源 

分 类 号：TM28[一般工业技术—材料科学与工程]