Application of x-ray diffraction for analysis in the synthesis of ferrites

As a fundamental part of the work to obtain ferrites, from waste materials (Tailings) of the nickel industry, it is the analytical control and monitoring products as well as the conditions of synthesis. Through this work the study of magnetic products is carried out using magnetometry and X-ray diffraction characterization of their properties, and the qualitative and quantitative analysis. First, the ideal temperature calcination was determined for which an average crystallite size of magnetic spinel as large as possible and with high magnetic response is obtained. Subsequently the magnetic and phase analysis of final products, following five different formulations synthesis, was performed. This analysis showed, that in general the method results in solids, even with varying amounts of hematite as impurity in four formulations, having a high magnetic saturation after calcination. XRD analysis made to the products featured determining the average crystallite size as indicative aspect of border interference. Furthermore, the structural refinement (profile matching variant) for the quantitative analysis of phases was carried on, fact that arguments the differences of magnetism for the five formulations. Rietveld method for detailed determination of the structure of the ferrite F-59 and its nonstoichiometric formula was also applied. (Author)