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

The microstructures and the microwave dielectric proper-ties 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 x f value of 130,000GHz can be obtained for the system with x = 0.9 at 1300 degrees C. For practical application, a dielectric constant (epsilon(r)) of 24.3, a Q x f value of 112,000 GHz and a temperature coefficient of resonant frequency (tau(f)) of -10.1 ppm/degrees C for 0.85(Mg0.95Zn0.05TiO3-0-15Ca(0.61)Nd(0.26)TiO(3) at 1300 degrees C is proposed in this paper. (c) 2006 Elsevier B.V. All rights reserved.