Abstract
Conventional solid-state route method was used to prepare barium titanate ceramics doped with Y2O3 and Nb2O5, Ba(Y0.5Nb0.5)xTi(1-x)O3 (x = 0.02, 0.04, 0.06, 0.08). The X-ray diffraction results confirmed that Y3+ and Nb5+ both substitute for Ti4+ at the B-site of ABO3 perovskite type structure, and second phase appeared for x = 0.04 and 0.06. With the increases of Y3+ and Nb5+ concentrations, peak of dielectric constant of Ba(Y0.5Nb0.5)xTi(1-x)O3 ceramics shifts to lower temperature more rapidly than that of BaZrxTi1-xO3 ceramics as the same x content. It was found that Ba(Y0.5Nb0.5)0.06Ti0.94O3 ceramics has compact structure, better temperature stability of dielectric constant, larger dielectric tunability under DC electric field. The results showed that, the Y2O3 and Nb2O5 doping improved the figure of merit for the BaTiO3 ceramics.
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