ZnTiO_3 Doping Effect on Dielectric Properties of CCTO Ceramics via a Molten Salt Process

摘要

CaCu_3Ti_4O_(12) (CCTO) powder was prepared by solid-state reaction. CCTO-ZnTiO_3 composites were prepared by reaction of CCTO powder with molten ZnCl_2 in air, at 400°C. The products were examined by X-ray diffraction and scanning electron microscopy. The electric properties of CCTO-ZnTiO_3 composite ceramic were investigated. It is shown that the ceramic composites have higher grain-boundary resistivity and nonlinear coefficient. The addition of Zn mainly formed in the form of ZnTiO_3 also affected the low frequency capacitance values, reduced the CCTO ceramic dielectric loss, which showed a Schottky-type nature of potential barrier. Moreover, the mechanisms involved in the NBLC model were discussed, where it is working with the IBLC model.