A New Temperature Stable Microwave Dielectric Material Mg_(0.5)Zn_(0.5)TiNb_2O_8

摘要

A new temperature stable, low-loss, low sintering temperature microwave dielectric material Mg_(0.5)Zn_(0.5)TiNb_2O_8 was investigated for the first time. Single phase Mg_(0.5)Zn_(0.5)TiNb_2O_8 was obtained, and it showed Columbite structure which was tri-ixio-lite structure. The variation trend of dielectric constant was in accordance with variation trend of relative density. When the sintering temperature was lower than 1120℃, the Qf value increased with the increasing of relative density. When the sintering temperature was higher than 1120℃, the Qf value decreased with the increasing of the unit cell volume. With the decrease of bond strength, the τ_f increased. The typical values of e = 30.74, Qf= 66 900 GHz, τ_f = -4.01 × 10~(-6)/℃ were obtained for Mg_(0.5)Zn_(0.5)TiNb_2O_8 sintered at 1120℃ for 6 h.