ISSN:
1432-2021
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
Abstract Natural and synthetic olivines with ferrous and ferric iron have been studied by Mössbauer spectroscopy. Their spectra exhibit three superimposed quadrupole-split doublets corresponding to Fe2+ at M1 and M2 sites and Fe3+ at an unidentified position, which is probably M2. The hyperfine parameters of Fe3+ at temperatures between 300°C and 450°C are: Δ=0.67–1.23 mm/s, δ=0.04–0.23 mm/s relative to metallic iron, and the full width at half height, HW=0.15–0.43 mm/s. The Fe2+ populations of M2 decrease with increasing Fe3+ content. However, Fe2+ prefers M1 in synthetic olivines, even at high temperatures (800°–1,400°C). In kirschsteinite, Fe2+ and Fe3+ are exclusively in M1. Fe2+/Fe3+ ratios estimated from the peak areas are consistent with chemical analyses.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00309458
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