Abstract
The effect of V2O5 addition on the aqueous tape casting of Li1.075Nb0.625Ti0.45O3 microwave ceramics has been investigated. The isoelectric point of the ceramic particles moved slightly toward more acid region after the dispersant absorbed on the particles, while the zeta potential increased significantly. The rheological test indicated that the ceramic slurry exhibited a typical pseudoplastic behavior without thixotropy and the addition of V2O5 increased the viscosity of the slurries. It is found that doping of V2O5 can improve the densification of Li1.075Nb0.625Ti0.45O3 green tapes. Due to the liquid phase effect of V2O5 addition, Li1.075Nb0.625Ti0.45O3 ceramic could be sintered at 900°C. A secondary phase was observed at the level of 3 wt% V2O5 addition. The addition of V2O5 does not induce much degradation on the microwave dielectric properties. In the case of 2 wt% V2O5 addition, the ceramics show good microwave dielectric properties of ɛr = 65, Q×f = 6350GHz. It represents that the ceramics could be promising for multilayer low-temperature co-fired ceramics (LTCC) application.
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