Magnetic and Dielectric Properties of BST/BF Multiferroic Ceramic Materials

Abstract

Abstract:The lead-free multiferroic ceramic of (1-x)Ba 0.70 Sr 0.30 TiO 3 (BST) + xBiFeO 3 (BFO) was synthesized by a conventional solid-state reaction method. The dielectric, ferroelectric and magnetic properties was studied. The X-ray diffractomentry (XRD) revealed that the ceramic formed a single perovskite structure. The results suggested that the remanent magnetization (Mr) reached to maximum when the BFO content is up to 0.05. The powder of the samples Mr = 70 memu/g when x = 0.05. The change of the electrical resistance with magnetic field of the (1-x)Ba 0.70 Sr 0.30 TiO 3 + xBiFeO 3 samples reached 25.6% when x = 0.03. The relative dielectric constant was reduced under magnetic field compared with no magnetic field and the change is 13.1% as x = 0.01. It is indicated that the lead-free multiferroic ceramic of (1-x)Ba 0.70 Sr 0.30 TiO 3 + xBiFeO 3 exhibited both ferroelectric and magnetic at room temperature. The ferroelectric and magnetic properties are derived from the displacement of magnetic atom iron and the change of the atomic spin state.