Abstract
The effect of MgO content on the microstructure and microwave dielectric properties of MgO-doped 0.84CaTiO3–0.16Sm0.9Nd0.1AlO3 ceramics, prepared by solid-state reaction method, was investigated. The permittivity, ϵr, of the MgO-doped 0.84CaTiO3–0.16Sm0.9Nd0.1AlO3 ceramics was about 65, and it decreased slightly with increasing MgO content. And the temperature coefficient of resonant frequency, τf was tuned from +53.3ppm/°C to +26.4ppm/°C as the MgO addition increasing. In addition, it is found that a small amount of MgO could effectively promote the uniformity of the grain morphology, which is beneficial for the improvement of Q×f value. However, grain growth was restrained, and secondary phase MgAl2O4 was observed as MgO content increasing to 0.8wt%; thus, Q×f value deteriorated seriously. Considering these three parameters of the microwave dielectric properties, the 0.4wt% MgO-doped 0.84CaTiO3–0.16Sm0.9Nd0.1AlO3 ceramics exhibited the best performance of ϵr=64.21, Q×f=30867GHz, and τf=26.4ppm/°C sintered at 1375°C for 3h.
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