Influence of V ₂ O ₅ Additions to 5Li ₂ O–1Nb ₂ O ₅ –5TiO ₂ Ceramics on Sintering Temperature and Microwave Dielectric Properties

Abstract

The effects of the addition of V 2 O 5 on the sintering behavior, microstructure, and microwave dielectric properties of 5Li 2 O–1Nb 2 O 5 –5TiO 2 (LNT) ceramics have been investigated. With low‐level doping of V 2 O 5 (≤3 wt%), the microstructure of the LNT ceramic changed from a special two‐level intergrowth structure into a two‐phase composite structure with separate grains. And the sintering temperature of the LNT ceramics could be lowered to around 900°C by adding a small amount of V 2 O 5 without much degradation in microwave dielectric properties. Typically, better microwave dielectric properties of ɛ r =41.7, Q × f =7820 GHz, and τ f =45 ppm/°C could be obtained for the 1 wt% V 2 O 5 ‐doped ceramics sintered at 900°C.