Tesis caracterización estructural y magnética del multiferroico Bi0.96Sm0.04FeO3 y Bi0.93Sm0.07FeO3

Abstract

This work reports synthesis and characterization of the systems and , produced by the solid-state reaction method. The oxides obtained was characterized by X ray diffraction (XRD), Rietveld refinement and magnetization measures in function of the magnetic field applied and temperature. The structural characterization by Rietveld refinement and XRD allow identification perovskite type structure on all the materials with rhombohedral crystalline system and R3c space group. The characterization by scanning electron microscope (SEM) allow determinate that the sintered solids present a homogenous microstructure. The magnetization curves in function of magnetic field applied between 50 and 300 K and in function of the temperature between 500 and 1000 Oe of the sintered solids exhibited a ferromagnetic behavior, with a rise of the permanent magnetization (MR), the coercive field (HC) and the magnetic susceptibility when the samarium concentration rise up. The structural and magnetic characteristic that are generated in the obtained solids make these materials to big interest as multiferroic components.