Abstract
The microstructures and microwave dielectric properties of the (1-x)(Mg0.95Zn0.05)TiO3–xCa0.6La0.8/3TiO3 ceramic system were investigated. To achieve a temperature-stable material, we studied a method of combining a positive-temperature-coefficient material with a negative one. Ca0.6La0.8/3TiO3 has the following dielectric properties: a dielectric constant of εr∼109, a Q×f of ∼17,600 GHz and a large positive τf of ∼213 ppm/°C. (Mg0.95Zn0.05)TiO3 possesses a dielectric constant of εr∼16, a high Q×f of ∼210,000 (at 9 GHz) and a negative τf of -60 ppm/°C. As x varies from 0 to 0.9, the (1-x)(Mg0.95Zn0.05)TiO3–xCa0.6La0.8/3TiO3 ceramic system has the following dielectric properties: 16<εr<88, 32,800<Q×f<210,000 and -60<τf<205. By appropriately adjusting the x value in the (1-x)(Mg0.95Zn0.05)TiO3–xCa0.6La0.8/3TiO3 ceramic system, a zero τf value can be attained. With x=0.15, a dielectric constant εr of ∼26, a Q×f value of ∼86,000 GHz (at 9 GHz) and a τf value of ∼0.5 ppm/°C were obtained for 0.85(Mg0.95Zn0.05)TiO3–0.15Ca0.6La0.8/3TiO3 ceramics sintered at 1320 °C for 4 h.
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