Other
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hyint.110..217d&link_type=abstract
Hyperfine Interactions, Volume 110, Issue 3-4, pp. 217-225
Other
4
Scientific paper
Room temperature 57Fe Mössbauer effect measurements have been used to investigate the local Fe environment and the Fe3+/Fe2+ ratio in a Tibetan tektite. The spectrum has been analyzed in terms of two quadrupole splitting distributions; one corresponding to Fe2+ and one corresponding to Fe3+. The Fe2+ sites show a mean isomer shift of +1.011 mm/s relative to α-Fe and a mean quadrupole splitting of 1.845 mm/s. The Fe2+ quadrupole splitting distribution showed a large peak for positive values, which has been identified with Fe2+ with local octahedral coordination, and a smaller peak for negative values, which has been identified with Fe2+ with local tetrahedral coordination. The Fe3+ sites showed an average isomer shift of +0.20 mm/s and a single peaked quadrupole splitting distribution with a mean near zero. The Fe3+/Fe2+ ratio, based on the relative areas of the spectra components was found to be 0.015. These results are discussed in terms of those obtained using fitting methods based on discrete sites and other distributions of parameters. Hyperfine parameters for the Tibetan tektite are compared with those obtained for tektites from other regions of the Australasian strewn field. All tektites studied show similar quadrupole distributions and similar mean hyperfine parameters. Fe3+/Fe2+ ratios ranged from 0.005 to 0.036. The relationship of the microstructure of the Tibetan tektite with that of tektites from various regions of the Australasian strewn field is discussed.
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