Abstract
Zn-doped and (Zn+Mn) co-doped CaCu3Ti4O12 ceramics were prepared by the citrate–nitrate combustion derived powders in order to investigate the effect of dopants on the microstructure and electrical properties. The results showed that giant dielectric response was enhanced by co-doping of Zn and Mn. Compared with other samples, (Zn+Mn) co-doped ceramics exhibit a fine-grained microstructure. Much stronger nonohmic properties were realized in these ceramics. It is significant that the (Zn+Mn) co-doping effectively reduced the dielectric loss in the medium frequency region and at room temperature. At x = 0.05 and y = 0.03, low dielectric loss ~0.026 and moderate dielectric constant ~6620 were observed at room temperature and 10 kHz. The present results indicate that (Zn+Mn) co-doping may improve the dielectric properties and increase the grain boundary resistance of CaCu3Ti4O12.
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