Abstract
The crystal structures and the microwave dielectric properties of the (1-x)CaTiO3–xCa(Mg1/3Nb2/3)O3 perovskite ceramic system have been investigated. The (1-x)CaTiO3–xCa(Mg1/3Nb2/3)O3 solid solution exhibited orthorhombic crystal structures for all compositions. As the x value increases from 0.2 to 0.8, the dielectric constant εr decreases from 109 to 36 and the unloaded quality value Q×f increases from 8600 to 39000 (at 6.7 GHz). The temperature coefficient of the resonant frequency (τf) varies from 298 to -30 ppm/°C as the x value increases from 0.2 to 0.8. A new microwave dielectric material, 0.4CaTiO3–0.6Ca(Mg1/3Nb2/3)O3, applicable in microwave devices is suggested and possesses the dielectric properties of a dielectric constant εr∼54, a Q×f value ∼32000 (at 6.7 GHz) and a τf value ∼18 ppm/°C. Further improvement of the τf value is expected by adjusting the x value of (1-x)CaTiO3–xCa(Mg1/3Nb2/3)O3 ceramics.
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