DiP227: Microwave dielectric properties of complex perovskite Ba(Mg1/3Ta2/3)O3

The microwave dielectric properties of complex perovskite Ba(Mg1/3Ta2/3)O3 have been investigated in the temperature range from 20°C to 110°C and the frequency range from 10.5 GHz to 14.5 GHz as a function of annealing time. The ordering of Mg and Ta in Ba(Mg1/3Ta2/3)O3. increases with increasing annealing time, and there is no drastic change in the ordering of Mg and Ta when the annealing time was over 20 hr at 1500°C. Unloaded Q which depends on the ordering of Mg and Ta shows maximum value when the specimens are annealed at 1500°C for 20 hr. With increasing annealing time, the dielectric constant, the temperature dependence of dielectric constant and the temperature coefficient of resonant frequency increase, while the temperature dependence of unloaded Q decreases. These results are due to the increase of lattice distortion with increasing annealing time.