Dielectric and ferroelectric properties of (1−x)BaTiO3–xBi0.5Na0.5TiO3 ceramics

Abstract Lead-free (1 − x )BaTiO 3 – x Bi 0.5 Na 0.5 TiO 3 ( x = 0.01, 0.02, 0.05, 0.1, 0.2, 0.3) ferroelectric ceramics were fabricated by the conventional ceramic technique. Sintering was made at 1200 °C for 2–4 h in air atmosphere. The crystal structure was investigated by X-ray diffraction. The dielectric and ferroelectric properties were also studied. Room temperature permittivity was found to decrease as Bi 0.5 Na 0.5 TiO 3 (BNT) content increases. Only the sample with 0.3 mol BNT was found to have relaxor behaviour. The T c shifted slightly only for BNT addition lower than 0.1 mol. The highest T c (about 150 °C) was obtained for 0.2 mol BNT addition. The remanent polarization, P r , decreases whereas the coercive field, E c , increases monotonously as the BNT content increases.