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A model for the interpretation of Mössbauer spectra of muscovite

Geological Institute of the Russian Academy of Science, Pyjzhevsky Street 7, 109017 Moscow, Russia

^* Corresponding author, e-mail: dainyak{at}ginras.ru

The literature Mössbauer parameters for a representative collection of muscovites, which were interpreted assuming the possible coexistence of trans- and cis-vacant sheets, were used to prove an alternative interpretation in terms of the local structure. Crystal-chemical models including the assignment of the local cation arrangements (LCA) around Fe³⁺ and Fe²⁺ to predicted and tentative quadrupole splitting values, respectively, and the LCA occurrence probabilities provided by the simulation of two-dimensional cation distribution (CD) were used. The obtained CD reconstructions in dioctahedral trans-vacant sheets correspond to the two types of muscovites revealed by Mössbauer spectroscopy. The main contributors into type-I muscovite are the 2R²⁺Al LCAs around Fe²⁺ (R²⁺ stands for Fe²⁺ and Mg) whereas in type-II muscovite the 3Al and 2AlFe³⁺ LCAs are more important. This implies a more ordered CD in type-II muscovites than that in type-I muscovites from the point of view of Pauling’s principle of the homogeneous dispersion of charge.

Key-words: Mössbauer spectroscopy, muscovite, isomorphous cations, order-disorder, crystal-chemical models.

This article has been cited by other articles:

				L. G. Dainyak, V. S. Rusakov, I. A. Sukhorukov, B. B. Zviagina, and V. A. Drits An improved model for the interpretation of Mossbauer spectra of dioctahedral 2:1 trans-vacant Fe-rich micas: refinement of parameters European Journal of Mineralogy, October 1, 2009; 21(5): 995 - 1008. [Abstract] [Full Text] [PDF]