Bulk and surface phases of iron oxides in an oxygen and water atmosphere at low pressure
作者： Guido Ketteler , Werner Weiss , Wolfgang Ranke , Robert Schlögl
DOI: 10.1039/B009288F
关键词: Oxygen 、 Platinum 、 Magnetite 、 Mineralogy 、 Iron oxide 、 Analytical chemistry 、 Dissociation (chemistry) 、 Phase diagram 、 Phase boundary 、 Hematite 、 Chemistry
摘要: Thermodynamic stability ranges of different iron oxides were calculated as a function the ambient oxygen or water gas phase pressure (p⩽1 bar) and temperature by use computer program EquiTherm. The diagram for Fe–H2O is almost completely determined O2 due to H2O dissociation equilibrium. formation epitaxially grown oxide films on platinum ruthenium substrates agrees very well with diagrams. Thin exhibit advantage over single crystals that bulk diffusion has only limited influence establishment equilibrium phases. Near boundary Fe3O4–Fe2O3, surface structures are observed consisting biphase ordered domains FeO(111) on both oxides. They formed kinetic effects in course oxidation hematite reduction magnetite, respectively. Annealing Fe3O4(111) film 5 × 10−5 mbar at 920–1000 K results new γ-Fe2O3(111)-like intermediate during α-Fe2O3(0001). A model suggested growth redox processes involving several phases discussed.
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