The study on electrical behavior of Gd2O3-WO3 complex ceramics at high temperature

Gd2O3-WO3 complex ceramics are fabricated by the conventional solid-state reaction process. The electrical characteristics and dielectric properties of the samples were measured at various ambient temperatures in a low electric field (E < 150 V/mm). As the temperature increases, the dielectric constant and the loss tangent show an obvious change at about 50 °C and 330 °C. When the temperature is above 200 °C, the samples display stable nonlinear electrical properties characterized by semiconductivity, and the nonlinearity increases along with increasing temperature. XRD analysis reveals that Gd2W2O9 is the main phase and Gd2O3 is the secondary phase. Based on the phase transition of tungsten trioxide, these electrical properties of Gd2O3-WO3 complex ceramics can be simply explained.