Abstract
Gallium-based SrREGa3O7 (RE = La, Pr) melilite ceramics were prepared and selected to modify their microwave dielectric properties. Sintered at 1425 °C for 6 h, SrLaGa3O7 (SLGO) and SrPrGa3O7 (SPGO) ceramics exhibited high relative densities of 98.33 and 95.23%, low εr values of 11.8 and 10.9, Q×f values of 32,500 GHz (at 12.1 GHz) and 26,400 GHz (at 12.7 GHz), negative τf values of −32 and −54 ppm/°C. As a compensator, CaTiO3 can tune the τf values of SLGO and SPGO to near zero (+2 and −4 ppm/°C). In SrREGa3O7 melilite ceramics, the εr and τf values are mainly dependent on ionic polarizability, crystal structure and the “rattling” effect. The micromorphology, XPS, Raman spectrum and A-site bond valence (VRE) of SrREGa3O7 (RE = La, Pr) microwave dielectric ceramics have also been comprehensively reported.
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