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Thermally activated electron delocalization in deerite |
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| Authors: | G Amthauer K Langer M Schliestedt |
| Institution: | 1. Institut für Mineralogie, Universit?t Marburg, 3550, Marburg, Germany (F.R.G.) 2. Institut für Mineralogie und Kristallographie, Technische Universit?t Berlin, 1000, Berlin 12, Germany (F.R.G.) 3. Mineralogisch-Petrographisches Institut, Technische Universit?t Braunschweig, 3300, Braunschweig, Germany (F.R.G.) |
| Abstract: | The 57Fe Mössbauer spectra of deerites of different chemical composition, taken at several temperatures, show that Fe2+ and Fe3+ occupy all the six-coordinated lattice sites with a preference of Fe3+ probably for the M(1) to M(3) positions, and a preference of Fe2+ probably for the M(4) to M(6) and the M(7) to M(9) sites. The room and high temperature spectra reveal absorption patterns due to thermally activated Fe2+ → Fe3+ electron delocalization. The extent of electron delocalization is dependent on the chemical composition, e.g., the amount of ions (Mg, Mn, Al) substituting for Fe. |
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