Structural, magnetic and dielectric properties of Sc modified (1 − y)BiFeO 3– yBaTiO 3 ceramics

Abstract

In this study, the bulk ceramics with general formula (1 − y)BiFe 1− x Sc x O 3– yBaTiO 3 ( x = 0.1–0.3, y = 0.1–0.3 mol%) were prepared by the traditional solid-state method. Their structural, magnetic, dielectric properties were investigated. X-ray diffraction analysis indicated that all samples crystallized in pure perovskite structure. The structural phase transition from R3c to Pm-3m occurred when the amount of BaTiO 3 exceeded 20 mol%. The room temperature M– H curves were obtained and scandium doping could decrease the magnetic coercive field. Thus the soft magnetic property of prepared solid solutions could be improved. Frequency dependence of dielectric constant and loss were studied. The results indicated that addition of an appropriate amount of scandium could reduce the dielectric loss. The dielectric losses of 0.7BiFe 1− x Sc x O 3–0.3BaTiO 3 ( x = 0, 0.1, 0.2, 0.3) at 1 kHz were 0.104, 0.094, 0.043 and 0.057 respectively.