Preparação, caracterização estrutural e magnética da hexaferrita de estrôncio dopada com cobalto

Abstract

In this work, pure samples of strontium hexaferrite (SrFe12O19), were synthesized at three different calcination temperatures of 1000°C, 1100°C, 1200°C. And also samples where Fe ions were replaced by Cobalt ions in four different Quantities, following the balancing SrFe12-xCoxO19 where x = 0.1, x= 0.3, x = 0.5 and x = 2.0 a °C, through the solid state reaction method. These samples were characterized by X-ray diffraction and magnetic hysteresis, the results of the diffractograms showed that the desired phase (SrFe12O19) was evident, in all samples, but in the substituted samples x = 0.3 and x = 2.0, the phase of Hematite (Fe2O3). In the hysteresis analysis it was evidenced that the coercive field and the saturation magnetization did not undergo significant changes in the pure samples with increased temperature, however for the dosed samples there was a gradual decrease in the field Coercive and saturation magnetization.