Phase compositions and dielectric properties of Li 2 Mg 3 Sn 1 − x O 6 ceramics attained by reaction sintering process

The reaction sintering, without calcination and following re-grinding, has been paid increasing attention. Non - stoichiometric Li 2 Mg 3 Sn 1 − x O 6 ( x = 0.00, 0.02, 0.04, 0.06, 0.08, 0.10) ceramics were successfully gained through reaction sintering process in the study, and its phase composition, morphology and dielectric characteristics were studied. This XRD patterns of Li 2 Mg 3 Sn 1 − x O 6 samples prepared after sintering at 1,305 ℃ for 6 h indicates that green bodies are mainly composed of Li 2 Mg 3 SnO 6 phase, accompanied by the second phase of Mg 2 SnO 4 . A host of pores, elliptic - like grains and wrinkle - like grains were visibly observed from the SEM images of Li 2 Mg 3 Sn 1 − x O 6 ceramics, which is because of the severe volatilization of Li elements at high temperature. The apparent density, relative permittivity, quality factor and temperature coefficient of resonant frequency of samples will be devastate owing to porous morphology and Mg 2 SnO 4 phase to a large extent. Finally, when x = 0.08, Li 2 Mg 3 Sn 0.92 O 6 ceramics have optimal dielectric performances: ε r = 9.133, Q×f = 55,429 GHz, τ f = -36.1 ppm/℃.