Abstract
Y2O3 was selected as a substitute for Bi2O3 and the effects of substitution on the sintering behavior and microwave dielectric properties of BiNbO4 ceramics were studied. With the addition of 0.5 wt% CuO–V2O5 mixtures, all Bi(1-x)YxNbO4 ceramics could be densified below 900°C. The triclinic phases were identified in Bi(1-x)YxNbO4 ceramics with x=0.03 and the intensities of triclinic peaks increased with increasing x and sintering temperature. Saturated bulk density decreased from 7.17 g/cm3 to 6.99 g/cm3 and εr from 44.21 to 37.32 with increasing x from 0 to 0.1 for Bi(1-x)YxNbO4 ceramics. Q×f was mainly influenced by sintering temperature. τf changed with x and sintering temperature. The τf values of dense Bi(1-x)YxNbO4 ceramics continuously decreased from 28.32 ppm/°C to -8.78 ppm/°C with the increase in x from 0 to 0.1.
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