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The crystallographic properties and cationic distribution of M0.2Fe2.8O4 (M = Mn, Ni, Cu) and Fe3O4 thin films prepared by sol-gel method have been investigated by X-ray diffraction (XRD) and conversion electron Mössbauer spectroscopy (CEMS). The ionic valence, preferred site, and hyperfine field of Fe ions of the ferrites could be obtained by analyzing the CEMS spectra. The M0.2Fe2.8O4 films were found to maintain cubic spinel structure as in Fe3O4 with the lattice constant slightly decreased for Ni substitution and increased for Mn and Cu substitution from that of Fe3O4. Analyses on the CEMS data indicate that Mn 2+ and Ni ions substitute octahedral Fe sites mostly, while Cu ions substitute both the octahedral and tetrahedral sites. The observed intensity ratio AB/AA of the CEMS subspectra of the samples exhibited difference from the theoretical value. It is interpreted as due to the effect of the M substitution for A and B on the Debye temperature of the site. The relative line-broadening of the B-site CEMS subspectra can be explained by the dispersion of magnetic hyperfine fields due to random distribution of M cations in the B sites.

CEMS Study of Ferrite Films M0.2Fe2.8O4(M =Mn, Ni, Cu)

CEMS Study of Ferrite Films M_0.2Fe_2.8O₄(M =Mn, Ni, Cu)