Complementary pathway in the synthesis of strontium hexaferrite by the polyol method
Abstract
Strontium hexaferrite (SrFe12O19) is a type of magnetic material that belongs to the family of hard ferrites, that is, with a high coercive field. Due to their magnetic properties, they are generally used for the manufacture of electronic devices, mainly in power generation, magnetic recording and telecommunications. The present work is focused on the synthesis of SrFe12O19, by the polyol method, from stoichiometric mixtures of Sr(CH2COO)2 and Fe(CH3CO2)2, in diethylene glycol (DEG) and subsequent heat treatment in a range of temperatures between 500 and 1000°C. X-ray diffraction was used for the crystallographic characterization of the obtained powders, in this way it was verified that it is possible to synthesize strontium hexaferrite by means of polyol and thermal treatment at a temperature of 950°C. The polyol synthesis allowed to obtain magnetite with reverse spinel structure and when applying the thermal treatment the crystalline structure changed to hexagonal structure of the space group P63/mmc. On the other hand, by means of vibrating sample magnetometry, hysteresis cycles were performed in a range of ± 18 kOe, at room temperature, obtaining saturation magnetization values of 56 emu/g and a coercive field of 5.7 KOe. These results are similar to the values reported by other authors who used different synthesis routes.
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