Abstract
The microwave dielectric properties of the (1−x)MgAl2O4–x(Ca0.8Sr0.2)TiO3 (x = 0.02 to 0.10) ceramic system synthesized by the traditional solid-state reaction method have been investigated. Spinel-structured MgAl2O4 was present together with perovskite-structured (Ca0.8Sr0.2)TiO3, and this multiphase system was verified by x-ray diffraction (XRD) and energy spectrum analyses throughout the whole compositional range. With increasing x, the temperature coefficient of resonant frequency (τf) and permittivity (er) gradually increased. Consequently, near-zero τf could be obtained for samples with x = 0.08. Excellent microwave dielectric properties with relative permittivity (er) of 10.92, quality factor (Q × f) of 52,563 GHz (at 12.9 GHz), and temperature coefficient of resonant frequency (τf) of −5.6 ppm/°C were obtained for 0.92MgAl2O4−0.08(Ca0.8Sr0.2)TiO3 composite sintered at 1440°C for 3 h, making this material a promising candidate for use in global communication satellites and radar detectors.
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