Sintering behavior and microwave dielectric properties of V 5+ substituted Li 3 Mg 2 SbO 6 ceramics

The Li 3 Mg 2 (Sb 1−x V x )O 6 (0.01 ≤ x ≤ 0.04) ceramics have been synthesized by the solid-state reaction method. The effects of V 5+ ion substitution on the sinterability, phase composition and microwave dielectric properties of Li 3 Mg 2 (Sb 1−x V x )O 6 ceramics were investigated. The dehiscence and secondary phase in Li 3 Mg 2 SbO 6 -based ceramics could be effectively inhibited by partial substitution of V 5+ on the Sb 5+ sites. The optimum microwave dielectric properties (ε r = 11.2, Qxf = 54,700 GHz, τ f = − 20 ppm/°C) were obtained for Li 3 Mg 2 (Sb 1−x V x )O 6 (x = 0.03) ceramics sintered at 1250 °C. The ε r of Li 3 Mg 2 (Sb 0.97 V 0.03 )O 6 ceramics was mainly depended on ionic polarizability as well as density, whereas its Qxf was strongly dominated by average grain size.