Phase compositions and dielectric properties of Li2Mg3Sn1 − xO6 ceramics attained by reaction sintering process

Abstract

The reaction sintering, without calcination and following re-grinding, has been paid increasing attention. Non - stoichiometric Li₂Mg₃Sn_1 − xO₆ (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 Li₂Mg₃Sn_1 − xO₆ samples prepared after sintering at 1,305 ℃ for 6 h indicates that green bodies are mainly composed of Li₂Mg₃SnO₆ phase, accompanied by the second phase of Mg₂SnO₄. A host of pores, elliptic - like grains and wrinkle - like grains were visibly observed from the SEM images of Li₂Mg₃Sn_1 − xO₆ 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 Mg₂SnO₄ phase to a large extent. Finally, when x = 0.08, Li₂Mg₃Sn_0.92O₆ ceramics have optimal dielectric performances: ε_r = 9.133, Q×f = 55,429 GHz, τ_f = -36.1 ppm/℃.