Abstract
The effects of CuO additives on the microstructures and the microwave dielectric properties of (1-x)(Mg0.95Co0.05)TiO3–xCaTiO3 ceramics were investigated. The CuO additives can effectively reduce the sintering temperature of the ceramics to as low as 1175°C. With x = 0.08, at 1275°C, the 0.92(Mg0.95Co0.05)TiO3–0.08CaTiO3 ceramic possesses excellent microwave dielectric properties: a dielectric constant εr of 22.1, a Q×f value of 86400 GHz (at 7 GHz) and a τf value of 5.4 ppm/°C. Sintered ceramic samples were characterized by using X-ray diffraction pattern and SEM. Dielectric constants (εr) are not significantly affected by various additives and range from 20 to 23. By properly adjusting the x of (1-x)(Mg0.95Co0.05)TiO3–xCaTiO3 ceramics, small temperature coefficients (< ±3 ppm/°C) of resonant frequency (τf) are obtained for 0.93(Mg0.95Co0.05)TiO3–0.07CaTiO3 with 0.25 wt% CuO additives.
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