Abstract
The crystalline phase and microwave dielectric properties of the (1-x)Al2O3–xTiO2 ceramics with 2 wt% MgO–CaO–SiO2–Al2O3 (MCAS) glass additions have been investigated. Combining the material with negative temperature coefficient of the resonant frequency (τf) (Al2O3, τf=-60 ppm/°C) with the positive one (TiO2, τf=+450 ppm/°C) can produce the composite with τf∼0 ppm/°C. The Al2TiO5 phase starts to appear at 1250°C and the crystalline intensity of the Al2TiO5 phase increases with the increase of sintering temperature. The density, dielectric constant (εr) and quality factor (Q×f) of the MCAS-added Al2O3–TiO2 ceramics reach maximum values in samples sintered at 1250–1300°C and then decrease with the increase of sintering temperature. The density and the Q×f values of the MCAS-added Al2O3–TiO2 ceramics decrease with the increase of the TiO2 content, while the εr and τf values increase. The MCAS-added (1-x)Al2O3–xTiO2 ceramic with x=0.12 sintered at 1300°C exhibits a minimum τf value of -0.6 ppm/°C.
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