Abstract
Low-permittivity Sr2MgSi2O7 ceramics with tetragonal crystal structure were prepared through the conventional solid-state method. X-ray diffraction patterns and scanning electron microscopy were used to analyze the phase and micromorphology of the specimens sintered at temperature from 1260 to 1320 °C. The bond ionicity, lattice energy and bond energy of Sr2MgSi2O7 ceramics were calculated to investigate the relationships between microwave dielectric properties and microstructures. Optimum microwave dielectric properties were obtained when the sample was sintered at 1280 °C for 4h: er = 6.85, Q × f0 = 22,530 GHz (f = 9.20 GHz), τf = − 32 ppm/°C.
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