Preparation and microwave dielectric properties of CaTiO3 added Mg0.95Ni0.05Ti0.98Zr0.02O3 composite ceramics for high frequency applications

Mg0.95Ni0.05Ti0.98Zr0.02O3 and CaTiO3 were prepared separately using solid state reaction method. The effect of CaTiO3 addition on the microwave dielectric properties of Mg0.95Ni0.05Ti0.98Zr0.02O3 was investigated to get low loss and temperature stable ceramics in (1 - x)Mg0.95Ni0.05Ti0.98Zr0.02O3-xCaTiO(3) series. Mg0.95Ni0.05Ti0.98Zr0.02O3 formed as the major phase along with Mg0.95Ni0.05Ti2O5 phase that formed as minor secondary phase for the composition with x = 0. Microwave dielectric properties epsilon(r) similar to 17.1, Q(u)f(o) of 195,855 GHz and tau(f) of -46.3 ppm/degrees C were obtained for the composition with x = 0. The positive tau(f) value of CaTiO3, tuned the tau(f) value of Mg0.95Ni0.05Ti0.98Zr0.02O3 through zero and epsilon(r) similar to 28.4, Q(u)f(o) similar to 108,775 GHz and tau(f) similar to 3.1 ppm/degrees C were attained for x = 0.15 in this study. This composition is the best choice for high frequency applications.