CaCu_3Ti_4O_(12)陶瓷显微结构及介电性能

Microstraction and dielectric properties of CaCu_3Ti_4O_(12) ceramics

采用固相法制备CaCu3Ti4O12陶瓷,并对其烧结温度、晶相结构、致密化过程、显微结构及介电性能与频率的关系进行了研究。研究发现,不同烧结温度下,1000℃制备的CaCu3Ti4O12陶瓷为立方钙钛矿结构且结晶完好,晶格常数为7.394?。CaCu3Ti4O12陶瓷具有良好的显微形貌,结构致密,平均晶粒尺寸在3-5μm。CaCu3Ti4O12陶瓷在10kHz处的介电常量高达7200,介电损耗约为0.06。

CaCu3Ti4O12 ceramics with high dielectric constant have been synthesized by solid state reaction method. CaCuaTi4O12 was studied in detail on different sintering temperatures, crystal structure, densification, and microstructure as well as frequency dependence dielectric properties. It is found that ceramics sintered at 1000℃ was perovskite-related body-centered cubic compound with good crystallization. The lattice constant of CaCu3Ti4O12 is 7.394A° that is consistent with the theoretical value. CaCu3Ti4O12 ceramics have the fine-grained microstructure and densified structure. The average grain size of sintered CaCuaTi4O12 ceramics is 3-5 μm. CaCu3Ti4O12 ceramics exhibits a dielectric constant at 10 kHz about 7200 and dielectric loss tangent about 0.06.