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Sites occupancy of Fe3+ in Garfield Nontronite: A spectroscopic study |
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| Authors: | Dominique Bonnin Georges Calas Hélène Suquet Henri Pezerat |
| Institution: | 1. Laboratoire de Physique Quantique, ERA CNRS no 676, ESPCI, 10 rue Vauquelin, F-75231, Paris Cedex 05, France 2. Laboratoire de Minéralogie et Cristallographie, LA CNRS no 09, Universités Paris VI et VII, 4 place Jussieu, F-75230, Paris Cedex 05, France 3. Laboratoire de Chimie des Solides, ERA CNRS no 3, Université Paris VI, 4 place Jussieu, F-75230, Paris Cedex 05, France |
| Abstract: | New data on the structure of Garfield nontronite have been produced by the use of different spectroscopic techniques: Mössbauer spectroscopy, optical spectroscopy, X-ray absorption edges and EXAFS and NMR. The tetrahedral iron content is found to be no higher than 1 percent. All iron atoms belong to the octahedral sheet excluding the possibility of the presence of non crystallized phases. Some ambiguities remain about the coherence of the octahedral sheet because of the presence of two doublets in the Mössbauer spectrum and at least two lineshapes in NMR spectra of OH which correspond to different environments. |
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