Microwave dielectric properties of 5Li₂O-0.583Nb ₂O₅-3.248TiO₂ ceramics with v₂O ₅

The effects of V₂O₅ addition on the sintering behavior, microstructure, and the microwave dielectric properties of 5Li ₂O-0.583Nb₂O₅-3.248TiO₂ (LNT) ceramics have been investigated. With addition of low-level doping of V ₂O₅ (≤2 wt%), the sintering temperature of the LNT ceramics could be lowered down to around 920°C due to the liquid phase effect. A secondary phase was observed at the level of 2 wt% V₂O ₅ addition. The addition of V₂O₅ does not induce much degradation in the microwave dielectric properties but lowers the τ_f value to near zero. Typically, the excellent microwave dielectric properties of ε_r = 21.5, Q × f=32938 GHz, and τ_f = 6.1 ppm/°C could be obtained for the 1 wt% V ₂O₅-doped sample sintered at 920°C, which is promising for application of the multilayer microwave devices using Ag as an internal electrode.