
TY  - JOUR
A1  - Childs, CW 
A1  - Dickson, DPE 
A1  - Goodman, BA 
A1  - Lewis, DG 
T1  - Moessbauer parameters for ferrihydrites at 4 K
JF  - Soil Research
JO  - Soil Res.
Y1  - 1984
VL  - 22
IS  - 2
SP  - 149
EP  - 154
KW  - 
UR  - https://doi.org/10.1071/SR9840149 
N2  - The Moessbauer spectra at 4.2K for five ferrihydrites (one natural, four synthetic) have been determined. Two of the samples contained silicon (atomic ratio Si/Fe= 18%, 21%) and one contained aluminium (Al/Fe = 19%). The Moessbauer parameters were calculated from peak positions estimated by a fit of one set of six Lorentzian lines to each spectrum and by judging absorption maxima by eye. Hyperfine magnetic field (H) values were between 50.0 and 50.4 T for pure samples and between 48.3 and 49.2 T for samples containing silicon or aluminium. 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. 
ER  -

