Energetics of stable and metastable low-temperature iron oxides and oxyhydroxides

Details Energetics of stable and metastable low-temperature iron oxides and oxyhydroxides Energetics of stable and metastable low-temperature iron oxides and oxyhydroxides

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998gecoa..62.2905l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 62, Issue 17, pp.2905-2913

Physics

6

Scientific paper

The energetics of a set of synthetic iron oxides and oxyhydroxides were determined by transposed temperature drop calorimetry and high temperature solution calorimetry using sodium molybdate as a solvent at 979 K. The experiments allow the calculation of the enthalpy of formation from the elements of -Fe 2 O 3 with tetragonal symmetry (812.7 ± 2.6 kJ/mol) and with cubic symmetry (-812.3 ± 2.5 kJ/mol) and -FeOOH (557.6 ± 2.4 kJ/mol), values currently unavailable in the literature. Maghemite, -Fe 2 O 3 , is 15.3 ± 0.9 kJ/mol less stable in enthalpy than hematite, -Fe 2 O 3 .

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