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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Room temperature (57)Fe Mossbauer spectroscopy has been used to investigate the structural and oxidation state of Fe in tektites from different strewn fields. Spectra have been analyzed in terms of two quadrupole splitting distributions corresponding to Fe(3+) and Fe(2+). All tektites show similar distribution of quadrupole splitting. Each distribution has one peak. The Fe(2+) sites show a narrow region of Mossbauer line shift ( delta) and quadrupole splitting ( e), d = 1.02 - 1.10 mm/ s and e = 0.85 - 1.00 mm/ s relative to alpha- Fe. These values have been assigned to intermediate coordination between tetrahedral and octahedral. The Fe3+ sites show wider regions of hyperfine parameters: d = 0.25 - 0.45 mm/ s and e = 0.65 - 0.90 mm/ s. The Fe(3+)/ Fe(2+) ratio was found to be 0.05 - 0.15.