Abstract
Two melilite ceramics Sr2AGe2O7 (A = Mg, Zn) with low permittivity were prepared by a solid-state reaction method. The crystal structure and microstructure of the ceramics were characterized by X-ray diffraction, transmission electron microscopy, Raman spectroscopy, and scanning electron microscopy. Both ceramics crystallized in a single melilite structure with a tetragonal space group P-42m (113) and exhibited homogeneous microstructures. Optimum microwave dielectric properties with relative permittivity (εr) of 8.56, quality factor (Q × f) of 28,800 GHz, and temperature coefficient of resonance frequency (τf) of −70.5 ppm/°C were obtained in Sr2MgGe2O7 sintered at 1330 °C. Sr2ZnGe2O7 possessed εr of 8.81, Q × f of 35,700 GHz, and τf of −84.4 ppm/°C when sintered at 1290 °C. Thermal stability of resonance frequency was accessible when the negative τf values of Sr2AGe2O7 were adjusted after the formation of composite ceramics with CaTiO3.
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