EFFECT OF THERMAL ANNEALING ON PHASE TRANSFORMATIONS AND ORDERING OF THE MAGNETIC TEXTURE OF Fe3O4/Nd2O3 NANOCOMPOSITES

Abstract

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 Fe₃O₄/Nd₂O₃ 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 Fe₃O₄/Nd₂O₃ 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 Fe₂O₃/NdFeO₃ → NdFeO₃ >>Fe₂O₃→ NdFeO₃ type was established using X-ray phase analysis. According to the data of Mössbauer spectroscopy it was established that the domination of the NdFeO₃ 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 kOe, approaching the values characteristic of the Fe₂O₃ structure (513 kOe).