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Magnetic NiFe2O4 structure formation was studied through structural,  compositional and magnetic characterization of obtained reaction products of  a simple, high yielding and low-cost solid-state reaction. Initial annealing  of the starting oxides mixture at 700ºC did not allow us to observe formation  of the desired magnetic phase. In contrast, subsequent thermomagnetic  measurements up to 800ºC indicated the considerable increase of the magnetic  moment, which can be reasonably assigned to the changes in phase composition  and formation of magnetic NiFe2O4 structure during the heating cycle of  measurements. Nanosized NiFe2O4 phase formation has been confirmed by the  following XRD and MS phase analyses and its nanocrystalline structure by XRD  and SEM/TEM techniques. The obtained hysteresis loop taken after TM  measurements suggest the increased volume of magnetically active material and  thus additionally support the previous findings

Formation of magnetic microstructure of the nanosized NiFe2O4 synthesized via solid-state reaction