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

Christel Laberty, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

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 γ-Fe2O3 with tetragonal symmetry (812.7 ± 2.6 kJ/mol) and with cubic symmetry (-812.3 ± 2.5 kJ/mol) and β-FeOOH (557.6 ± 2.4 kJ/mol), values currently unavailable in the literature. Maghemite, γ-Fe2O3, is 15.3 ± 0.9 kJ/mol less stable in enthalpy than hematite, α-Fe2O3.

Original languageEnglish (US)
Pages (from-to)2905-2913
Number of pages9
JournalGeochimica et Cosmochimica Acta
Volume62
Issue number17
DOIs
StatePublished - Sep 1998
Externally publishedYes

ASJC Scopus subject areas

  • Geochemistry and Petrology

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