Microwave Dielectric Properties of 5Li ₂ O–0.583Nb ₂ O ₅ –3.248TiO ₂ Ceramics with V ₂ O ₅

Abstract

The effects of V 2 O 5 addition on the sintering behavior, microstructure, and the microwave dielectric properties of 5Li 2 O–0.583Nb 2 O 5 –3.248TiO 2 (LNT) ceramics have been investigated. With addition of low‐level doping of V 2 O 5 (≤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% V 2 O 5 addition. The addition of V 2 O 5 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 ɛ r =21.5, Q × f =32 938 GHz, and τ f =6.1 ppm/°C could be obtained for the 1 wt% V 2 O 5 ‐doped sample sintered at 920°C, which is promising for application of the multilayer microwave devices using Ag as an internal electrode.