Síntese e investigações estruturais e magnéticas no sistema BaTi0,7Fe0,3O3 dopado com manganês e cromo

Abstract

The present dissertation proposes to make Barium Titanate (BaTiO3) a magnetoelectric multiferroic material by replacing 30% titanium with iron. Magnetoelectric multiferroic materials have ferroelectricity as well as magnetic properties and there is an increase in research on these materials as they may contribute to the development of multifunctional devices that are present in almost every aspect of modern technology due to the possibility of mutual control of ferroelectric characteristics with application of magnetic fields and vice versa. The samples were synthesized by the solid-state method. BaTi0,7Fe0,3O3 samples was doped with different percentages of manganese and chromium, these elements chosen to be filled as gaps that arise from the damage caused by the replacement of titanium with iron and increase the ferroelectricity of the material. The samples were calcined at 1100 ºC for 5 hours in a muffle furnace and the following characterization techniques were applied: X-ray diffraction, which allowed to verify the crystal structures and lattice patterns; magnetic hysteresis that allowed to verify as magnetic properties and; infrared spectroscopy which investigated as molecular properties. In addition, the unit cell volume and density values were calculated, where the values were compared with the JCPDS (Joint Committee for Powder Diffraction Studies) database.