Moessbauer parameters for ferrihydrites at 4 K

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Abstract
The Moessbauer spectra at 4.2 K for 5 ferrihydrites (1 natural, 4 synthetic) were determined. Two of the samples contained Si (atomic ratio Si/Fe 18, 21%) and one contained Al Al/Fe = 19%). The Moessbauer parameters were calculated from peak positions estimated by a fit of 1 set of 6 Lorentzian lines to each spectrum and by judging absorption maxima by eye. Hyperfine magnetic field (H) values were 50.0-50.4 T [tesla] for pure samples and 48.3-49.2 T for samples containing Si or Al. Variations as small as these, due to impurities, would not prevent ferrihydrite being distinguished from lepidocrocite (H = 46.0 .+-. 0.5 T for pure, well-crystallized material) in Moessbauer spectra of soil samples at 4.2 K.

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