SURFACE STUDIES OF RE3FE5O12 GARNETS, REFEO3 ORTHOFERRITES AND REVO4 ORTHOVANADATES

The X-ray photoelectron spectra for Re3Fe5O12 garnets, ReFeO3 orthofer rites and ReVO4 orthovanadates have been measured by using Mg K-alpha radiation. The O 1s, Re 4d, Fe 2p, and V 2p photoelectron spectra were studied. A very big difference was observed between ReFeO3 orthoferri tes and ReVO4 orthovanadates, mainly the Fe 2p(3/2) lines were double broader than V 2p(3/2) ones, and the O 1s line is split by about 1.6 e V for orthoferrites, while this line is single for orthovanadates. The O 1s peak at 531.8 eV with intensity about 70% of the main peak is in terpreted as originated from a charge fluctuation between oxygen and i ron ions due to superexchange interaction.