The structure and properties of 0.95MgTiO3–0.05CaTiO3 ceramics co-doped with ZnO–ZrO2

The (Mg0.93Ca0.05Zn0.02)(Ti1−xZrx)O3 ceramics were prepared by conventional solid-state route. The dielectric properties and structure of (Mg0.93Ca0.05Zn0.02)(Ti1−xZrx)O3 ceramics were investigated. It has been found that MgTiO3 and CaTiO3 are the main phases and a second phase CaZrTi2O7 appeared in 95MCT ceramics co-doped with Zn–Zr. With Zn–Zr additive, the sintering temperature of 95MCT ceramics can be reduced to 1300 °C, and adjust the temperature coefficient of dielectric constant. With the increasing of Zr content, dielectric constant ɛr decrease from 22.6 to 19.91 and the temperature coefficient of dielectric constant αc from 5.93 to 2.52 ppm/°C when x = 0.01, 0.02, 0.03 and 0.04 mol respectively. The 95MCT ceramics with x = 0.02 has a dielectric constant ɛr of 22.02, a dielectric loss of 2.78 × 10−4 and a temperature coefficient of dielectric constant αc value of 2.98 ppm/°C.