Microwave dielectric characteristics of Ba(Mg1/3Ta2/3)O3 ceramics sintered at low-temperatures

The microwave dielectric properties and microstructures of Ba(Mg1/3Ta2/3)O3 (BMT) ceramics sintered at low temperatures with 2–3 wt.% NaF additives were investigated. BMT ceramics sintered at 1340 °C for 3–12 h showed dielectric constants (εr) of 25.5–25.7, Qf values of 41 500–50 400 GHz and temperature coefficients of the resonator frequency (τf) of 10.9–21.4 ppm °C−1. The variation of sintering time almost had no effect on the dielectric constant. The Qf value increased and the τf decreased with increasing sintering time. The ordering degree of Mg2+ and Ta5+ at B-sites increased with increasing sintering time.