Abstract
Gd2Mo3O12 ceramics were prepared using the traditional solid-phase reaction method. All samples were found to possess an orthorhombic crystal structure with a space group of Pba2, as revealed by refined XRD results. The ceramic sintered at 1000 °C exhibited a high relative density of 96.95% and superior microwave dielectric properties, including εr of 9.42 ± 0.05, Q × f of 49258 ± 1200 GHz, and τf of -71.8 ± 0.7 ppm/°C. The results suggest a correlation between an increase in εr and higher relative density, and a more compact and uniform microstructure can lead to higher Q × f value. Chemical bonding theories and Raman spectroscopy analysis reveal that Mo-O bonds, rather than Gd-O bonds, dominate the microwave dielectric properties. Furthermore, the εr of Gd2Mo3O12 ceramic was closely related to bond ionicity, while Q × f and τf were mainly determined by lattice energy and bond energy, respectively.
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