Abstract
(1-x)Bi0.5Na0.5TiO3-x(Bi3.25La0.75)Ti3O12; (1-x)BNT-xBLT ceramics with x = 0–0.20 wt.% were prepared by solid-state reaction method. The Bi0.5Na0.5TiO3 (BNT) and (Bi3.25La0.75)Ti3O12 (BLT) powders were calcined separately. The BNT powder was calcined at 850 °C for 2 h. and BLT powder at 750 °C for 4 h. The (1-x)BNT-xBLT samples were sintered between 1050 °C and 1200 °C for 4 h. All samples exhibit almost a pure perovskite phase with coexistence of rhombohedral and orthorhombic phases. The average grain size decreased with increased in x(BLT) contents. The maximum density and relative density of about 5.87 ± 0.11 g/cm3 and 97.2% were obtained for the composition of 0.97BNT–0.03BLT. The temperature at maximum permittivity (T m) tended to increase from 324 °C to 341 °C with increase in x(BLT) contents. The results revealed that the fatigue behavior was improved in the sample of 0.97BNT–0.03BLT, where a slight decrease in remanent polarization with low degradation of ferroelectric properties was observed after electrical fatigue.
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