Abstract
The energy-storage properties of SrTiO3-doped (15, 20, 25, and 30 mol%) 0.80Bi1/2Na1/2TiO3–0.20Bi1/2K1/2TiO3 lead-free antiferroelectric ceramics were investigated by two-step sintering method. The ceramics with higher SrTiO3 content had smaller grain sizes and a more homogeneous distribution. About 25 mol% SrTiO3 doping induced antiferroelectric properties, showing a typical double hysteresis loops, accompanied by a large energy density. The first sintering temperature of the ceramics had main impact on the relative density, and the high relative density possessed large external breakdown strength. The optimum electrical performances with a low remanent polarization (Pr = 1.9 μC/cm2), a low coercive field (Ec = 1.7 kV/cm) and a large energy density (W = 0.97 J/cm3) at 10 Hz were obtained at 1,190 °C for a SrTiO3 content of 25 mol%.
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