Phase structure, sintering behavior and adjustable microwave dielectric properties of Mg^sub 1−x^Li^sub 2x^Ti^sub x^O^sub 1+2x^ solid solution ceramics

Mg1-xLi2xTixO1+2x (1/5 ≤ x ≤ 1/2) solid solution ceramics were prepared by the solid state reaction method. The sintering behavior, microstructure and microwave dielectric properties of ceramics were investigated. X-ray diffraction patterns showed that MgO and Li2TiO3 could form Mg1-xLi2xTixO1+2x solid solutions with a rock salt structure. With increasing x values, the unit cell parameters of ceramics decreased, both the Q×f value and bulk density increased firstly, reached the max value and then decreased. Most importantly, the thermal stability of microwave dielectric properties for ceramics was improved. When x = 1/4, Li2Mg3TiO6 ceramics exhibited good microwave dielectric properties with Q×f = 110,703 GHz, εr = 13.6 and τf = -35.1 ppm/°C.