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Investigation of Al/Si ordering in tetrahedral phyllosilicate sheets by Monte Carlo simulation
-
Erika J. Palin
and
Martin T. Dove
Published/Copyright:
March 28, 2015
Abstract
We have investigated by Monte Carlo simulation the Al/Si ordering behavior of the tetrahedral phyllosilicate sheet, with a variety of compositions from Al1Si1 to Al1Si7, using atomic interaction parameters determined for the tetrahedral sheet in muscovite. Three different ordering schemes operate, depending on composition, with relatively Al-poor systems ordering in a muscovite-like (Al:Si = 1:3) pattern and relatively Al-rich compositions ordering in an “ABABAB” or margarite-like (Al:Si = 1:1) pattern, where ABABAB indicates the arrangement of atoms around a hexagonal ring of tetrahedral cation sites. The pattern corresponding to Al:Si = 1:2 occurs in intermediate compositions, but always in conjunction with another ordering pattern, except for one composition close to Al:Si = 1:2. Simulations of the same composition but with different ordering schemes can show different behavior, and this is evidence for metastability fields. The transition temperature for order-disorder Tc is strongly dependent on composition, and the dilution effect can be observed at low Al concentrations, with a critical concentration xc between 0.12 and 0.15.
Received: 2003-2-1
Accepted: 2003-5-6
Published Online: 2015-3-28
Published in Print: 2004-1-1
© 2015 by Walter de Gruyter Berlin/Boston
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