Preparation and property of low loss niobate microwave dielectric ceramics
In order to obtain niobate-based microwave dielectric ceramics with lower loss,Zn[(Ge0.5Mo0.5)xNb1-x]2O6(x=0.05,0.10,0.15,0.20)niobate microwave dielectric ceramics were prepared by solid-state reaction method with ZnO,GeO2,MoO3,and Nb2O5 as main raw materials.XRD,SEM,and vector network analyzer were used to characterize the phase composition,microscopic morphologies,and dielectric properties of materials,respectively.The results show that when the sintering temperature is 1 180℃,the surface morphology of microwave dielectric ceramics with x=0.05 is the most compact,with the maximum relative density of 94.58%,and has good microwave dielectric properties,dielectric constant εr is 21.7,quality factor Qf is 64 610 GHz,and temperature coefficient of resonant frequency τf is-81.2×10-6/℃.
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