Low temperature sintering and dielectric properties of Li_2MgTiO_4 microwave ceramics with BaCu(B_2O_5) addition for LTCC applications

摘要

The sintering behaviors and dielectric properties of the Li_2MgTiO_4 ceramics at microwave frequency were investigated as a function of BaCu(B_2O_5) in this paper. The addition of BaCu(B_2O_5) dramatically decreased the sintering temperature of Li_2MgTiO_4 ceramics from 1250 to 900 ℃. No secondary phase was detected and single phase Li_2MgTiO_4 with NaCl structure in the 1.0-4.0 wt% BaCu(B_2O_5) doped Li_2MgTiO_4 ceramics was confirmed, while a small amount of BaCu(B_2O_5) phase was found in the 8.0 wt% BaCu(B_2O_5) doped Li_2MgTiO_4 ceramics. No much deterioration of dielectric properties at microwave frequency of the BaCu(B_2O_5) doped Li_2MgTiO_4 ceramics sintered at 900 ℃ for 3 h occurs and favorable dielectric properties (ε_r = 15.8, Qf= 74,790 GHz and τf= — 24.3 ppm/℃) at microwave frequency were obtained for the Li_2MgTiO_4 ceramics with 4.0 wt% BaCu(B_2O_5) addition. Accordingly, such a favorable 4.0 wt% BaCu(B_2O_5)-doped Li_2MgTiO_4 ceramic might be a potential candidate material for LTCC applications.