Characterization and origin of two Fe3+ EPR spectra in kaolinite |
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| Authors: | J M Gaite P Ermakoff J P Muller |
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| Institution: | 1. Centre de Recherche sur la Matière Divisée, Université d'Orléans — CNRS UMR 0131, Rue de Chartres, BP 6759, F-45067, Orléans Cedex 2
2. Laboratoire de Mineralogie et Cristallographie, Université de Paris VI et VII — CNRS URA 09, 4 Place Jussieu, F-7525, Paris Cedex 05
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| Abstract: | The electron paramagnetic resonance (EPR) spectra of Fe3+ in a well cristallized kaolinite from Decazeville in France are well resolved. It is shown that in this sample there are mainly two slightly different spectra, well separated at low temperature and characterized at -150° C by the constants B 2 0 = 0.112 cm?1, B 2 2 = 0.0688 cm?1 for one and B 2 0 = 0.116 cm?1, B 2 2 = 0.0766 cm?1 for the second. These two spectra arise from Fe3+ substituted for Al3+ at the two octahedral positions in equal amounts. The temperature dependence of EPR spectra was studied and was explained by a modification of the octahedral sites. |
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