Abstract
Abstract The microwave dielectric properties of the (1 − x )(Mg 0.95 Co 0.05 )TiO 3 – x Ca 0.6 La 0.8/3 TiO 3 ceramic system prepared by mixed oxide route have been investigated. The crystal structures and the microstructures of the ceramics were characterized by means of X-ray and SEM. The microwave dielectric properties are functions of the sintering temperature as well as the composition. Alternation of phases between ilmenite-type structure and pseudo-cubic perovskite crystal is observed. The 0.9(Mg 0.95 Co 0.05 )TiO 3 –0.1Ca 0.6 La 0.8/3 TiO 3 ceramics possesses excellent microwave dielectric properties with a dielectric constant ɛ r of 21.86, a Q × f value of 131,000 GHz (at 7 GHz) and a τ f value of −15.5 ppm/°C at 1350 °C/4 h. It is proposed as a suitable material candidate for applications requiring low microwave dielectric loss.
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