Abstract

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 °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 εr = 13.1, Q×f = 28 900 GHz (at 7.86 GHz), τf = −5.1 ppm/°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.

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