Investigação das propriedades magnéticas de amostras de IrO2 e Co:IrO2 sintetizadas via método de Pechini

Abstract

In this work the magnetic properties of iridium oxide synthesized via Pechini s method and doped with different concentrations of cobalt were studied. The proposal was to investigate the possibility of applying it as a diluted magnetic oxide (DMO1). The samples were characterized by x-ray diffraction to study the structural features by Rietveld refinement, which indicated that there is no inconsistency between the observed intensities and the calculated profile. The samples were characterized by magnetization measurements as a function of temperature and applied magnetic field. A paramagnetic behavior was observed in samples doped with low Co concentrations. However, a small change in the magnetism appears in samples with concentrations up to 10 mol% of Co. A new metamagnetic phase was observed for samples with 25% and 30% in mol of Co.