Study of the phase composition of the FePt nanosystem.

The paper is devoted to a study of the phase composition of bimetallic FePt nanoparticles synthesized by the co-reduction of precursor solutions by an alkaline solution of hydrazine hydrate. XRD structural analysis revealed the solubility limit of the components in a solid solution of a nanostructured Fe-Pt system (about 10 mol.% Fe). It was found that there was a difference between the molar fraction of iron determined by the XRD method and elemental analysis. Such a phenomenon made it possible to put forward an assumption about the existence of a diffraction-invisible part in the system under study. [ABSTRACT FROM AUTHOR]