【摘要】 采用固相合成及常压烧结的方法制备了CaCu3Ti4O12(CCTO)高介电常数陶瓷材料,采用XRD、SEM、LCR等测试手段对合成与烧结过程以及介电性能进行了研究。结果表明,在温度高于1000℃时,CaCO3、CuO和TiO2可完全反应生成CCTO;温度高于1150℃时,CCTO分解。CCTO合成粉体的适宜烧结温度为1100℃,烧结试样结晶完整,结构致密,1kHz频率下相对介电常数达1.5×104,介电损耗0.27。更多还原

【Abstract】 CaCu3Ti4O12 ceramics with high dielectric constant were prepared by solid-state reaction followed by densification at high temperatures.The synthesis and sintering as well as the dielectric properties of the ceramics were investigated by means of XRD,SEM,and LCR.It was found that single phase CaCu3Ti4O12 was synthesized from CaCO3,CuO and TiO2 powders at temperatures higher than 1000℃,but it would decompose at 1150℃.The optimum temperature for sintering CaCu3Ti4O12 was 1100℃,where dense and well crystallized CaCu3Ti4O12 ceramics with a high dielectric constant above 1.5×104 and a loss tangent about 0.27 were successfully obtained.更多还原