Novel temperature-stable Mg2TiO4-Ba3(VO4)2 microwave dielectric ceramics for LTCC applications

Novel temperature-stable Mg2TiO4-based ceramics are fabricated by a solid-state reaction method for developing low-temperature co-fired ceramics (LTCC) applications. Ba3(VO4)2 and LiF was used as additive to improve the sintering ability and temperature stability. Well-dense Mg2TiO4-Ba3(VO4)2 composite ceramics were obtained at 900 degrees C due to LiF liquid-phase sintering. The microwave dielectric characteristics strongly depended on Ba3(VO4)2 content x. Typically, balanced microwave dielectric properties of er = 13.1, Qxf = 28 900 GHz (at 7.86 GHz), zf = -5.1 ppm/degrees C are obtained for 0.55Mg2TiO4-0.45Ba3(VO4)2-6 wt%LiF ceramics. The well chemical compatibility of such composition with Ag electrodes means that it is suitable as a substrate material for LTCC applications.