Impedance spectroscopy of Li_2CO_3 doped (Ba,Sr)TiO_3 ceramic

摘要

(Ba_xSr_(1-x))TiO_3-based ceramic has been considered as one of the most important electronic materials widely employed in microwave passive device applications. Many researches have been performed to lower the high sintering temperature, by adding various dopants such as B_2O_3, La_2O_3, etc. In our previous study, by adding Li_2CO_3 to (Ba_(0.5),Sr_(0.5))TiO_3 ceramics, the sintering temperature of Li_2CO_3 doped (Ba_(0.5),Sr_(0.5))TiO_3 ceramics decreased from 1350 to 900 °C. This study observed the crystalline structure and electrical properties of Li_2CO_3 doped (Ba_(0.5),Sr_(0.5))TiO_3 ceramics. In scanning the crystalline structure of Li_2CO_3 doped (Ba_(0.5),Sr_(0.5))TiO_3 ceramics, no pyro phase was observed by X-ray diffraction analysis. To investigate the electrical properties of Li_2CO_3 doped (Ba_(0.5),Sr_(0.5))TiO_3 ceramics, real and imaginary parts of the impedances were analyzed. Complex impedance data were measured from 100 Hz to 1 MHz at various temperature ranges.