Study of ultrafine magnetic parameters of Fe2O3 @NdFeO3 nanocomposites depending on the Nd2O3 dopant concentration

Abstract

the article presents the results of a study of the ultrafine magnetic parameters of Fe 2 O 3 @NdFeO 3 nanocomposites obtained by solid-phase synthesis followed by thermal sintering of samples at a temperature of 1000 ◦ C. The study of hyperfine magnetic parameters was carried out by changing the Mossbauer spectra of the studied nanocomposites depending on the concentration of dopants. The resulting dependences of the hyperfine magnetic parameters were studied for nanocomposites depending on the Nd 2 O 3 dopant concentration, the content of which varied from 0.1 to 0.5 mol. As shown earlier, varying the dopant concentration leads to phase transformations of the Fe 2 O 3 @NdFeO 3 /Fe 2 O 3 type, followed by the dominance of the NdFeO 3 phase at high dopant concentrations of 0.4-0.5 mol. During studies of the hyperfine parameters of the magnetic field for nanocomposites under study, it was found that the obtained parameters are characteristic of the hematite (Fe 2 O 3 ) structure, with a high structural and magnetic ordering degree. The obtained dependences of the hyperfine parameters indicate that the decrease in the hyperfine magnetic field depending on the dopant concentration is due to structural deformations of the crystal lattice, as well as the dominance of the NdFeO 3 phase, which is the substitution phase.