Modeling of dioctahedral 2:1 phyllosilicates by means of transferable empirical potentials |
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| Authors: | C I Sainz-Diaz A Hernández-Laguna M T Dove |
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| Institution: | (1) Estacion Experimental del Zaidin (CSIC), C/ Profesor Albareda, 1. 18008-Granada, Spain Fax: +34 958 129600 e-mail: sainz@eez.csic.es, ES;(2) Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK, GB |
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| Abstract: | Dioctahedral 2:1 phyllosilicates with different interlayer charge have been studied theoretically by using transferable empirical
interatomic potentials. The crystal structures of pyrophyllite, muscovite, margarite, beidellite, montmorillonite, and different
smectites and illites have been simulated. The interatomic potentials were able to reproduce the experimental structure of
phyllosilicates with high, medium and low interlayer charge. The calculated structures are in agreement with experiment for
the main structural features of the crystal lattice. The effect of the cation substitution in the octahedral and tetrahedral
sheets on the structural features has been also studied. Good linear relationships have been found, and the calculated effects
are consistent with experimental results. Some unknown structural features of the crystal structures of clays are predicted
in this work.
Received: 8 March 2000 / Accepted: 19 September 2000 |
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| Keywords: | Dioctahedral 2:1 phyllosilicates Pyrophyllite Mica Smectite/illite Theoretical study Crystal structure Cation substitution effect |
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