Microwave dielectric characteristics of (1 − x)BaTi4O9-xBa(Mg1/3Ta2/3)O3 ceramics

The 1150 °C-calcined BaTi4O9 powder (BT4) and 1200 °C-calcined Ba(Mg1/3Ta2/3)O3 powder (BMT) are mixed to form the (1 − x)BMT-xBT4 compositions (x = 0.18, 0.3, 0.45, 0.6, and 0.8), and the mixed (1 − x)BMT-xBT4 compositions are sintered at 1240-1400 °C. The needed sintering temperatures of (1 − x)BMT-xBT4 ceramics are lowered down to about 1280-1320 °C, which are lower than that of Ba(Mg1/3Ta2/3)O3 ceramic is needed. The needed sintering temperatures of (1 − x)BMT-xBT4 ceramics are almost independent on the BaTi4O9 content. The morphologies changes from the disk-typed grains to two-phase structures, disk-typed grains and bar-typed grains coexist. The microwave dielectric characteristics of (1 − x)BMT-xBT4 ceramics are developed in this study. It is found that the content of BaTi4O9 has apparent effect on the crystal phase and the microwave dielectric characteristics of (1 − x)BMT-xBT4 ceramics.