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.
