Abstract
The Mössbauer fractions f for various ferrous- and/or ferric-containing oxides and oxyhydroxides, silicates and carbonates were evaluated from the experimental temperature dependence of their center shifts, using the Debye approximation for the second-order Doppler shift. It is concluded that ferrous ions exhibit a lower fraction as compared to ferric ions. Using standard mixtures of α-Fe2O3 with selected Fe2+ or Fe3+ compounds, it is found that the calculated Fe3+ f values are somewhat overestimated with respect to those of Fe2+. Possible explanations for this shortcoming are discussed and it is suggested that a different temperature dependence of the intrinsic isomer shift is the most likely reason. This suggestion is corroborated by analyses of hematite and hedenbergite data which are available for temperatures up to 900 K and 800 K respectively.
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De Grave, E., Van Alboom, A. Evaluation of ferrous and ferric Mössbauer fractions. Phys Chem Minerals 18, 337–342 (1991). https://doi.org/10.1007/BF00200191
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DOI: https://doi.org/10.1007/BF00200191