The paper presents the results of a study of the effect of thermal annealing on the phase transformations and subsequent ordering of the magnetic texture and superfine magnetic parameters in Fe 3 O 4 /Nd 2 O 3 nanocomposites obtained by chemical deposition and subsequent mechanochemical synthesis. X-ray phase analysis and Mössbauer spectroscopy were used to characterize the properties of the obtained Fe 3 O 4 /Nd 2 O 3 nanocomposites. Thermal annealing was carried out in an oxygen-containing medium in the temperature range of 400°C -1000°C for 5 hours followed by cooling for 24 hours until reaching room temperature. The phase transformation dynamics of Fe 2 O 3 /NdFeO 3 → NdFeO 3 >>Fe 2 O 3 → NdFeO 3 type was established using X-ray phase analysis. According to the data of Mössbauer spectroscopy it was established that the domination of the NdFeO 3 phase in the nanocomposite structure at annealing temperatures above 800°С leads to an ordering of the magnetic texture and an increase in the value of the superfine magnetic field to 502.8 kE, approaching the values characteristic of the Fe 2 O 3 structure (513 kE).
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