Ferrites-spinels of the MFe2O4 type (M = Co, Ni, Zn), produced by glycine-nitrate combustion were studied. A physicochemical study of ferrite samples was performed by X-ray fluorescence analysis, scanning electron microscopy, X-ray phase analysis, and X-ray spectroscopy. The average size of the coherent scanning region was found to be (nm): 28 ± 2 for CoFe2O4, 32 ± 2 for NiFe2O4, and 26 ± 2 for ZnFe2O4. Magnetic characteristics were determined by the NMR method. The specific residual magnetization, specific saturation magnetization, and coercive force were, respectively, 14.1 A m2 kg−1, 20.1 A m2 kg−1, 31800 A m−1 for CoFe2O4; 4.4 A m2 kg−1, 23.1 A m2 kg−1, 6550 A m−1 for NiFe2O4; and 5.1 A m2 kg−1, 18.3 A m2 kg−1, 3200 A m−1 for ZnFe2O4. Their magnetic properties show that the resulting ferrospinel powders can be used in the following fields of technology: CoFe2O4 in those areas where heat transfer is necessary (hyperthermia) and in development of data storage media; NiFe2O4 and ZnFe2O4 in those areas where low heat exchange is necessary, ZnFe2O4 for fast remagnetization and NiFe2O4 as a core or shell for transportation of other substances. The ferrospinel samples compare well in magnetic properties with their foreign commercial analogs, which makes these compounds commercially viable.
Russian Journal of Applied Chemistry – Springer Journals
Published: Jul 15, 2016
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