Abstract
(1-x)LaGaO3-xSrTiO3 (x = 0–0.6) microwave dielectric ceramics were synthesized by using conventional solid-state reaction method and sintered at 1450 °C with different sintering conditions. The variations of microstructure, relative density, and phase formation were observed by different composition and sintering conditions. The microwave properties, such as permittivity/dielectric constant (εr), quality factor (Qf), and temperature coefficient of resonant frequency (TCF, τf) at a high frequency were investigated in terms of lattice distortion, chemical ordering, and chemical homogeneity according to the composition and equilibrium sintering conditions. A maximum Qf ∼64,900 GHz was observed at x = 0, and the best τf ∼ 0 ppm/°C was obtained at x = 0.4. Consequently, it was found that the permittivity is related mainly to the lattice distortion, whereas the quality factor is primarily affected by chemical ordering and chemical homogeneity of the microstructure-induced composition.
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