Thermodynamics of Fe oxides: Part II. Enthalpies of formation and relative stability of goethite (α-FeOOH), lepidocrocite (γ-FeOOH), and maghemite (γ-Fe 2 O 3 )
2003; Mineralogical Society of America; Volume: 88; Issue: 5-6 Linguagem: Inglês
10.2138/am-2003-5-614
ISSN1945-3027
AutoresJuraj Majzlan, Klaus-Dieter Grevel, Alexandra Navrotsky,
Tópico(s)Electrochemical Analysis and Applications
ResumoThe enthalpy of formation from the elements at 298.15 K (ΔH0f ) of lepidocrocite (γ-FeOOH) and maghemite (γ-Fe2O3) has been measured by acid-solution calorimetry as -549.4 ± 1.4 and -808.1 ± 2.0 kJ/mol, respectively. The ΔH0f of goethite (α-FeOOH) was measured by high-temperature transposed temperature drop and acid-solution calorimetry as -559.5 ± 1.1 and -560.7 ± 1.2 kJ/mol, respectively.
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