New dielectric material system of (Mg0.95Zn0.05)TiO3–Ca0.61Nd0.26TiO3 at microwave frequency

The microstructures and the microwave dielectric properties of the x(Mg0.95Zn0.05)TiO3–(1 − x)Ca0.61Nd0.26TiO3 ceramic system prepared by conventional solid state method were investigated. In order to achieve a temperature-stable material, two compounds with negative and positive temperature coefficients were employed to form a mixed phases. With partial replacement of Mg by Zn, dielectric properties of the x(Mg0.95Zn0.05)TiO3–(1 − x)Ca0.61Nd0.26TiO3 ceramics can be promoted. The microwave dielectric properties are strongly correlated with the sintering temperature and the composition. An excellent Q × f value of 130,000 GHz can be obtained for the system with x = 0.9 at 1300 °C. For practical application, a dielectric constant (ɛr) of 24.3, a Q × f value of 112,000 GHz and a temperature coefficient of resonant frequency (τf) of −10.1 ppm/°C for 0.85(Mg0.95Zn0.05Ti)O3–0.15Ca0.61Nd0.26TiO3 at 1300 °C is proposed in this paper.