Dielectric and Magnetic properties of (1-x)BiFeO3-xBa0.8 Sr0.2TiO3 ceramics

The polycrystalline samples of (1 x)BiFeO3-xBa(0.8)Sr(0.2)TiO(3) (x = 0, 0.1, 0.2, 0.25, 0.3, 0.4 and x = 1) were prepared by the conventional solid state reaction method. The effect of substitution in BiFeO3 by Ba0.8Sr0.2TiO3 on the structural, dielectric and magnetic properties was investigated. X-ray diffraction study showed that these compounds crystallized at room temperature in the rhombohedral distorted perovskite structure for x <= 0.3 and in cubic one for x = 0.4. As Ba0.8Sr0.2TiO3 content increases, the dielectric permittivity increases. This work suggests also that the Ba0.8Sr0.2TiO3 substitution can enhance the magnetic response at room temperature. A remanent magnetization M-r and a coercive magnetic field H-c of about 0.971 emu/g and 2.616 kOe, respectively were obtained in specimen with composition x = 0.1 at room temperature. (c) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.