Изучение фазообразования в нанокомпозитах Fe2O3-Nd2O3→NdFeO3/Fe2O3 в результате термического отжига

Аннотация

The aim of this work is systematic study of the thermal annealing effect on the preparation of nanostructured composites NdFeO₃/Fe₂O₃ with a spinel type structure. The interest in these nanocomposites is due to the enormous potential of their application as a basis for magnetic devices, catalysts, and magnetic carriers for targeted drug delivery. As a synthesis method, two-stage synthesis was used, which includes mechanochemical grinding of nanopowders Fe₂O₃ and Nd₂O₃ in a planetary mill, followed by thermal annealing of the resulting mixture in a wide temperature range: 600-1000°C. During the studies carried out, it was found that in the initial state the obtained nanocomposites are a mixture of a solid solution of interstitial and substitutional Fe₂O₃ and Nd₂O₃. At an annealing temperature of 600°C, the onset of the formation of the NdFeO₃ phase is observed, which at a temperature of 1000°C is fully formed and dominates in the composite structure (content more than 85%). It was also found that during thermal sintering, the processes of phase transformations of the Fe₂O₃-Nd₂O₃→NdFeO₃/Fe₂O₃ type are accompanied by an increase in the particle size by a factor of 1.5-2.