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Mechanochemical synthesis of SrFe12O19 from recycled mill scale: Effect of synthesis time on phase formation and magnetic properties

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Abstract In the present study, the strontium hexaferrite (SrFe12O19) has been successfully produced from recycled mill scale and strontium carbonate (SrCO3) powders with stoichiometric ratio (SrCO3/Fe2O3) of 1:6 by mechanochemical… Click to show full abstract

Abstract In the present study, the strontium hexaferrite (SrFe12O19) has been successfully produced from recycled mill scale and strontium carbonate (SrCO3) powders with stoichiometric ratio (SrCO3/Fe2O3) of 1:6 by mechanochemical synthesis process, followed by annealing at 975 oC temperature. As the mechanochemical synthesis time increased, the phase ratio of hard magnetically SrFe12O19 in the structure increased after the annealing, according to the XRD analysis. The SrFe12O19 phase formation temperature decreased from 851 °C to 762 °C with increasing mechanochemical synthesis time. Also, FTIR analysis showed that The C=O bond peaks are only visible for a 2 h synthesis time at 854 cm-1 wavenumbers. Magnetic properties have changed according to particle size, activation energy, and phase ratios. The best magnetic properties were obtained with the application of 16 h of synthesis time. The coercivity values of 3.3, 3.6, 4.6, 5.5, 5,4, and 3.7 kOe were obtained for 2, 4, 8, 16, 32, and 64 hours of mechanochemical synthesis times, respectively. The residual magnetization density (Br) values under 1 T magnetic field for the same synthesis times were obtained as 168, 221, 292, 347, 314, 258 mT, respectively.

Keywords: synthesis; synthesis time; magnetic properties; phase; mechanochemical synthesis

Journal Title: Journal of Alloys and Compounds
Year Published: 2021

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