Abstract:
The CaCu3Ti4O12(CCTO)xZnO(x=0,0.05,0.20,0.60,1.00) ceramics is prepared with the solidstate reaction.The phase structure of CaCu3Ti4O12 ceramics are measured by Xray diffraction,and the morphology of CaCu3Ti4O12 ceramics is observed by scanning electron microscopy(SEM).Dielectric properties of ZnO doped CaCu3Ti4O12 composite ceramics are tested by the impedance analyzer. The result indicate that ZnO doping improve the growth of small grain and prevent that of the large grain at grain boundary.Meanwhile, the dielectric loss at the higher frequency is decreased.At x=1,the tan δ is less than 1.1 in the frequency range of 1 kHz~1 MHz, and the ceramic varistor voltage is increased to 100 V/mm.
