e4+掺杂的(Ba0.7-xSr0.3Cax)TiO3陶瓷电容器的研究

eO2-doped (Ba0.7-xSr0.3Cax)TiO3 (BSCT) dielectric ceramics were prepared by conventional solid state method, and their dielectric properties were investigated with variation of CeO2 doping content and sintering temperature. The X-ray diffraction patterns indicated that all the BSCT specimens possessed the perovskite polycrystalline structure. The experimental results r eveal that the introduction of CeO2 into (Ba0.7-xSr0.3Cax)TiO3 can control the grain growth, reduce the relative dielectric constant and dielectric loss, shift the Curie temperature to lower temperature and significantly improve the thermal stability of the BSCT ceramics. The samples doped with 0.6 mol% CeO2 sintered at 1320 癈 for 2 h exhibited attractive properties, including high relative dielectric constant, low dielectric loss, low temperature coefficient of capacitor over a wide temperature range from −25 癈 to +85 癈.