Effects of sintering method and BiFeO3 dopant on the dielectric and ferroelectric properties of BaTiO3–BiYbO3 based solid solution ceramics
(0.95– x ) BaTiO 3 –0.05 BiYbO 3 – x BiFeO 3 ( x = 0, 0.01, 0.02, and 0.04) (abbreviated as (0.95– x ) BT–0.05 BY– x BFO) ceramics were fabricated by conventional sintering (CS) and microwave sintering (WS) methods. Effects of sintering method and BFO dopant on the microstructure and electric properties of (0.95– x ) BT–0.05 BY– x BFO ceramics were comparatively investigated. X-ray diffraction showed that all CS and WS samples presented a single perovskite phase. It was also found that WS ceramics possessed denser microstructure and finer grains compared to CS samples as indicated by the surface morphology characterization. Dielectric measurements revealed that all samples exhibited the weak relaxation behavior; however, the degree of relaxation behavior of BT–BY based ceramic could be strengthened by addition of BFO and by WS method. Moreover, the temperature and frequency stability could be improved with doped BFO. The density of 0.93BT–0.05BY–0.02BFO ceramic was found to be the largest while that of 0.94BT–0.05BY–0.01BFO ceramic was the smallest, thus, the dielectric constant of 0.93BT–0.05BY–0.02BFO was significantly larger than that of 0.94BT–0.05BY–0.01BFO and 0.94BT–0.05BY–0.04 BFO ceramics. minimum dielectric constant of (0.95– x ) BT–0.05 BY– x BFO ceramic was obtained at x = 0.01. Ferroelectric measurements indicated that all samples showed the slim hysteresis loop. The remnant polarization ( P r ) and coercive field ( E C ) of (0.95– x ) BT–0.05 BY– x BFO ceramics first decreased and then increased with increasing x ，the minimum values were obtained at x = 0.01. Moreover, P r and E C of WS ceramics were slightly larger than those of CS ceramics, indicating that higher density and larger grain sizes contributed to enhancing the ferroelectric characteristic. These findings indicate that addition of moderate amount of BFO and use of WS technique can strengthen the degree of relaxation behavior and improve the ferroelectric properties of BT–BY based ceramics.
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