Abstract
In this paper, Mg2Ti1-xAl4/3xO4 ceramics (0.01 ≤ x ≤ 0.09) were synthesized through conventional solid-state ceramic route. The cubic spinel structure, microstructure and microwave properties of Mg2Ti1-xAl4/3xO4 (x = 0.01, 0.03, 0.05, 0.07, 0.09) ceramics were investigated by X-ray diffraction, Raman spectra, infrared spectra. Rietveld refinements confirm that a spinel structure phase with space group Fd-3m is formed. The variation of the permittivity was concerned with the ionic polarizability, and the value of τf was influenced by the bond valence. Both Q × f values and relative density showed an identical trend. Intrinsic properties of Mg2Ti1-xAl4/3xO4 ceramics were analyzed by infrared spectra and Raman spectra. In addition, the Mg2Ti1-xAl4/3xO4 ceramic sintered at 1420 °C for 4 h possessed optimal dielectric properties (εr = 14.65, Q × f = 182347 GHz, τf = −57.7 ppm/°C) when x = 0.09.
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