Dielectric properties and current–voltage nonlinear behavior of Ca1−xSrxCu3Ti4O12 ceramics

The effects of Sr doping on the dielectric properties and current–voltage nonlinear behavior of CCTO were investigated. By combining the observations of dielectric properties, current–voltage nonlinearity and impedance spectroscopy, we have found that Sr doping has influenced the electrical properties by adjusting the impedance characteristics of the grain and grain boundary. Among the Sr-CCTO specimens in this work, as Sr doping concentration is 10%, the specimen (Sr-CCTO-2) has the highest permittivity and lowest nonlinear coefficient.