Abstract
Novel Ca3Al2(GeO4)3 microwave dielectric ceramic with high Q was prepared by a conventional solid-phase reaction method. X-ray diffraction patterns (XRD) and X-ray Photoelectron Spectroscopy (XPS) analysis shown that the ceramic was a single garnet phase with parameters of a = b = c = 12.11845(16)Å, V = 1779.625(69) Å3 and Z = 8. As the sintering temperature increased from 1250 °C to 1350 °C, the bulk density (ρ), relative permittivity (εr) and quality factor (Q × f) values increased first, reached a maximum value and then decreased. The temperature coefficient of resonator frequency (τf) varied slightly in a small negative range from −15 to –22 ppm/°C. The Ca3Al2(GeO4)3 ceramic sintered at 1325 °C exhibited the best microwave dielectric properties of εr = 7.6, Q × f = 104,100 GHz and τf = −15 ppm/°C, showing that it is a good candidate for microwave devices with low dielectric loss.
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