Abstract
Abstract Microwave dielectric properties of corundum-structured Mg 4 Ta 2 O 9 ceramics were investigated as a function of sintering temperatures by an aqueous sol–gel process. Crystal structure and microstructure were examined by X-ray diffraction (XRD) technique and field emission scanning electron microscopy (FE-SEM). Sintering characteristics and microwave dielectric properties of Mg 4 Ta 2 O 9 ceramics were studied as a function of sintering temperature from 1250 °C to 1450 °C. With increasing sintering temperature, the density, e r and Qf values increased, saturating at 1300 °C with excellent microwave properties of e r =11.9, Qf =195,000 GHz and τ f =−47 ppm/°C. Evaluation of dielectric properties of Mg 4 Ta 2 O 9 ceramics were also analyzed by means of first principle calculation method and ionic polarizability theory.
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