Sintering Behavior and Microwave Dielectric Properties of LiF-Doped Li2Mg3Ti0.95(Mg1/3Ta2/3)0.05O6 Ceramics for LTCC Applications

Low-firing 1–4 wt.% LiF-doped Li 2 Mg 3 Ti 0.95 (Mg 1/3 Ta 2/3 ) 0.05 O 6 (LMTT) ceramics were synthesized via solid state reaction method. The effects of LiF on the phase composition, sintering behavior as well as microwave dielectric properties were systematically discussed. Adding LiF additives could lower the sintering temperature to 950°C for LMTT ceramics. X-ray powder diffraction analysis indicated that all the compounds prepared in this work have cubic symmetry with space group Fm - 3m . Typically, LMTT with 2 wt.% LiF exhibited a dense uniform microstructure and optimized microwave dielectric properties of ε r  ∼ 15.1 (± 0.2), Q · f  ∼ 60,100 GHz (at 8.3 GHz), and τ f  ∼ − 20.45 ppm/°C at 950°C. In addition, the good chemical compatibility with Ag electrode made LMTT-2 wt.% LiF ceramic an appropriate candidate for low temperature co-fired ceramic.