Emission Mössbauer studies of 57Co2+ and 119Sb5+ adsorbed on γ-Fe2O3 and NiFe2O4 surfaces |
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Authors: | S. Ambe T. Okada F. Ambe |
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Affiliation: | (1) The Institute of Physical and Chemical Research (RIKEN), 351-01 Wako-shi, Saitama, Japan |
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Abstract: | Summary Surface chemical states of57Co2+ and119Sb5+ ions adsorbed on γ-Fe2O3 and NiFe2O4 were studied in the presence of the aqueous phase using the magnetic interaction between the substrates and57Fe2+ or119Sn4+ arising from the adsorbed species. Two chemical forms were observed for the57Co2+ adsorbed on γ-Fe2O3; one giving a peak in the high-field region and another giving a broad distribution in the lower fields, which were attributed to57Co2+ at surfaceB sites of the spinel structure of γ-Fe2O3 and57Co2+ species weakly bonded to the substrate, respectively. In case of the NiFe2O4 substrate, the latter species was dominant and was converted to the former by heating. Most of the119Sb5+ ions adsorbed on the γ-Fe2O3 and NiFe2O4 particles were found to have a certain magnetic interaction with the magnetically ordered ions of the substrates. Paper presented at the ICAME-95, Rimini, 10–16, September 1995 |
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Keywords: | M?ssbauer spectra |
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