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- W2005355118 abstract "Abstract The coupled thermal oxidation and deprotonation in air of iron-rich biotite (FeO + Fe 2 O 3 = 34%) has been investigated by EXAFS and XANES spectroscopy at the Fe- K edge and by XANES spectroscopy at the Ti- K edge. Samples annealed for 5 h at temperatures between 250° to 600°C have been studied. Distortions mainly of the Fe-Fe correlation within the octahedral layers are reflected in increasing Debye-Waller factors of the Fe-Fe correlation peak proportional to the annealing temperature. Unchanged Fe-O nearest-neighbour and Fe-Fe next-nearest-neighbour coordination numbers show that these distortions, nonetheless, do not change the structural topology of the octahedral layers. A model is introduced to demonstrate that increasing distortions are compatible with the expected heterogenous deprotonation mechanism in biotite. Titanium occurs in octahedral coordination. It was found to be unaffected by the coupled oxidation/deprotonation process. Both the coordination number and the valence state stay constant during the annealing process, in spite of dramatic changes of the Fe 2+ /Fe 3+ ratio. Thermally activated hopping conduction involving Ti according to Fe 2+ Ti 4+ → Fe 3+ Ti 3+ is, therefore, not a significant process during thermal deprotonation and oxidation in biotite." @default.
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- W2005355118 date "1989-12-01" @default.
- W2005355118 modified "2023-09-26" @default.
- W2005355118 title "EXAFS and XANES spectroscopy study of the oxidation and deprotonation of biotite" @default.
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- W2005355118 doi "https://doi.org/10.1180/minmag.1989.053.373.10" @default.
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