Abstract
The microstructures and the microwave dielectric properties of the (1 − x)(Mg0.97Co0.03)2(Ti0.95Sn0.05)O4–xCaTiO3 ceramic system prepared by the conventional solid-state route were investigated. (Mg0.97Co0.03)2(Ti0.95Sn0.05)O4 possesses high dielectric constant (er = 14.23), high quality factor (Q × f = 188,760 GHz), and negative τf value (τf = −55.48 ppm/°C) at 1,390 °C for 4 h. In order to achieve a temperature stable material, CaTiO3, having a large positive τf value of 800 ppm/°C, was added to (Mg0.97Co0.03)2(Ti0.95Sn0.05)O4. Two phase system was confirmed by the X-ray diffraction patterns and the energy-dispersive X-ray analysis. Although the er of the specimen could be boosted by increasing amount of CaTiO3, it would instead render a decrease in the Q × f. By appropriately adjusting the x value in the (1 − x)(Mg0.97Co0.03)2(Ti0.95Sn0.05)O4–xCaTiO3 ceramic system, zero τf value can be achieved. A new microwave dielectric material, 0.91(Mg0.97Co0.03)2(Ti0.95Sn0.05)O4–0.09CaTiO3 ceramic sintered at 1,390 °C had optimal dielectric properties (er = 18.13, Q × f = 87,562 GHz, τf = 3.75 ppm/°C) which satisfied microwave applications in resonators, filters and antenna substrates.
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