摘要: Hydrothermal investigation of a portion the system Fe2O3-H2O has served to locate approximately hematite-goethite phase boundary. Calculations derived from experimental data provide following estimates thermodynamic properties goethite at 25°C: ΔHƒ = −132 Kcal/mol; S° +18.1 cal/mol-degree; ΔSƒ −51.0 ΔGƒ −117 Kcal/mol. Goethite is shown be stable ferric oxide under sub-aerial weathering conditions where relative humidity exceeds 60 percent. also in all normal marine environments, though hematite may become contact with saline liquors an evaporite basin.
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