Dielectric Properties and Electrical Conductivity of CaCu_3Ti_4O_(12) Ceramics Doped with Zr^(4+)

摘要

CaCu3Ti4O12 (CCTO) ceramics doped with Zr4+ were prepared. Effects of Zr4+ on microstructure, dielectric properties and conduction behavior of CaCu3Ti4-xZrxO12 (x=0, 0.05, 0.10, 0.20) ceramics were studied in the frequency range of 10-106 Hz. Grain size and dielectric loss of Zr4+-doped CCTO ceramic decreased compared with pure CCTO. The loss tangent (tanδ) of CaCu3Ti4-xZrxO12 (x=0.20) ceramic droped to 0.05 at a frequency of 1 kHz, which was reduced by 55% compared with pure CCTO ceramic. The mechanism effect of electrical conductivity on dielectric loss of Zr4+-doping CCTO ceramics was also discussed.