Mössbauer spectroscopic study of iron in Victorian brown coal

Details Mössbauer spectroscopic study of iron in Victorian brown coal Mössbauer spectroscopic study of iron in Victorian brown coal

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.1467c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 6, pp.1467-1475

Physics

4

Scientific paper

The forms of non-pyritic Fe in a suite of Victorian brown coals have been determined by 57 Fe Mössbauer analysis. The dominant Fe phase is a poorly-ordered ferric oxyhydroxide with a magnetic ordering temperature of (530 ± 50) K and particle size of approximately 50 Å. Upon exposure of the coal to air, this phase slowly crystallises to goethite. Most of the remaining Fe occurs as a high-spin Fe(II) species attributed to dissolved and hence mobile, Fe(II) humate, which precipitates as the ferric oxyhydroxide to an extent determined by the pH. A third species, present in a much lower concentration, appears to exhibit a transition from low-spin to high-spin Fe(II) as water is removed from the coal.

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