Abstract
The (Mg 0.93Ca 0.05Zn 0.02)(Ti 1− x Zr x )O 3 ceramics were prepared by conventional solid-state route. The dielectric properties and structure of (Mg 0.93Ca 0.05Zn 0.02)(Ti 1− x Zr x )O 3 ceramics were investigated. It has been found that MgTiO 3 and CaTiO 3 are the main phases and a second phase CaZrTi 2O 7 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 ɛ r decrease from 22.6 to 19.91 and the temperature coefficient of dielectric constant α c 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 ɛ r of 22.02, a dielectric loss of 2.78 × 10 −4 and a temperature coefficient of dielectric constant α c value of 2.98 ppm/°C.
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