Evaluation of ferrous and ferric Mössbauer fractions. Part II
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Mössbauer fractions f are reported for various ferrous- and/or ferric-containing oxides, hydroxides, silicates, and phosphates to extend the list previously reported by De Grave and Van Alboom (1991). The f fractions were evaluated from the experimental temperature dependencies of their center shifts, assuming the Debye model for the lattice vibrations. For most Fe2+ sites the characteristic Mössbauer or lattice temperatures ΘM are in the range 300–400 K, while those for Fe3+ sites are close to or exceed 500 K, implying significantly higher f fractions for Fe3+ than for Fe2+, in particular at room temperature. A correlation between ΘM and the coordination type, or, for a given valence state and coordination type, between ΘM and the mineral type is, however, not obvious.
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