Synthesis and Properties of Superparamagnetic Y-Fe2O3

Abstract

Method of nanodispersed g-Fe₂O₃ synthesis by thermal decomposition of iron citrate is proposed. The investigations of obtained oxides crystal­line and magnetic structures are done. Nanodispersed g-Fe₂O₃ with sizes of coherent scattering regions about 4-7 nm was is only one phase after gel sintering at 200, 250 and 300^оС; the particles of synthesized materials are in a state of magnetic ordering and in superparamagnetic state. The influence of mag­netic dipole interparticles interaction on parameters of Moss­bauer spectra is observed. The phenomenological mo­del of the differences between nanodispersed g-Fe₂O₃ magnetic micro­structures ob­tained after annealing at different tem­pe­ra­tu­res is presented.