Low temperature sintering and dielectric properties of Li2MgTiO4 microwave ceramics with BaCu(B2O5) addition for LTCC applications

The sintering behaviors and dielectric properties of the Li2MgTiO4 ceramics at microwave frequency were investigated as a function of BaCu(B2O5) in this paper. The addition of BaCu(B2O5) dramatically decreased the sintering temperature of Li2MgTiO4 ceramics from 1250 to 900 degrees C. No secondary phase was detected and single phase Li2MgTiO4 with NaCl structure in the 1.0-4.0 wt% BaCu(B2O5) doped Li2MgTiO4 ceramics was confirmed, while a small amount of BaCu(B2O5) phase was found in the 8.0 wt% BaCu(B2O5) doped Li2MgTiO4 ceramics. No much deterioration of dielectric properties at microwave frequency of the BaCu(B2O5) doped Li2MgTiO4 ceramics sintered at 900 degrees C for 3 h occurs and favorable dielectric properties (epsilon(r) = 15.8, Qf = 74,790 GHz and tau(f) = - 24.3 ppm/degrees C) at microwave frequency were obtained for the Li2MgTiO4 ceramics with 4.0 wt% BaCu(B2O5) addition. Accordingly, such a favorable 4.0 wt% BaCu(B2O5)-doped Li2MgTiO4 ceramic might be a potential candidate material for LTCC applications.