TY - JOUR
T1 - Energetics of stable and metastable low-temperature iron oxides and oxyhydroxides
AU - Laberty, Christel
AU - Navrotsky, Alexandra
N1 - Funding Information:
This work was supported by the National Science foundation (grant EAR-9725020). We thank Huiming Bao for providing the β-FeOOH phase.
PY - 1998/9
Y1 - 1998/9
N2 - 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.
AB - 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.
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U2 - 10.1016/S0016-7037(98)00208-7
DO - 10.1016/S0016-7037(98)00208-7
M3 - Article
AN - SCOPUS:0032409669
VL - 62
SP - 2905
EP - 2913
JO - Geochmica et Cosmochimica Acta
JF - Geochmica et Cosmochimica Acta
SN - 0016-7037
IS - 17
ER -