Physics and Chemistry of Minerals

, Volume 33, Issue 10, pp 655–666 | Cite as

DFT study of the cation arrangements in the octahedral and tetrahedral sheets of dioctahedral 2:1 phyllosilicates

  • Alfonso Hernández-Laguna
  • Elizabeth Escamilla-Roa
  • Vicente Timón
  • Martin T. Dove
  • C. Ignacio  Sainz-Díaz
Original Paper

Abstract

Quantum mechanical calculations based on the density functional theory (DFT) are used to study the crystal structures of dioctahedral 2:1 phyllosilicates. The isomorphous cation substitution is investigated by exploring different substitutions of octahedral Al3+ by Mg2+ or Fe3+, tetrahedral substitution of Si4+ by Al3+, and different interlayer cations (IC) (Na+, K+, Ca2+, and Mg2+). Samples with different kinds of layer charges are studied: only tetrahedrally charged, only octahedrally charged, or mixed octahedral/tetrahedral charged. The effect of the relative arrangements of these substitutions on the lattice parameters and total energy is studied. The experimental observation of segregation tendency of Fe3+ and dispersion tendency of Mg2+ in the octahedral sheet is reproduced and explained with reference to the relative energies of the octahedral cation arrangements. These energies are higher than those due to the IC/tetrahedral and IC/octahedral relative arrangements. The tetrahedral and octahedral substitutions that generate charged layers also tend to be dispersed. The octahedral cation exchange potentials change with the IC-charge/ionic radius value.

Keywords

Cation Substitution Octahedral Sheet Interlayer Cation Tetrahedral Sheet Octahedral Cation 

Notes

Acknowledgments

Authors are thankful to E. Artacho, J. M. Soler, and O. Paz for their useful discussions about SIESTA, A. R. Oganov for his comments, exchange program Royal Society of United Kingdom/Consejo Superior de Investigaciones Científicas (CSIC) of Spain, the “Centro Técnico de Informática” of CSIC, “Centro de Supercomputación de Galicia” (CESGA), and the “Centro de Supercomputación de la Universidad de Granada” for allowing the use of its computational facilities. E. Escamilla-Roa is thankful to Agencia Española de Cooperación Internacional (AECI), University of Granada and the BTE2000-1146-CO2-01 grant for financial support. This work was supported by Spanish Ministerio de Educación y Ciencia (MEC) and European FEDER grants BTE2002-03838 and PPQ2004-04648 grants.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Alfonso Hernández-Laguna
    • 1
  • Elizabeth Escamilla-Roa
    • 1
  • Vicente Timón
    • 1
  • Martin T. Dove
    • 2
  • C. Ignacio  Sainz-Díaz
    • 3
  1. 1.Estación Experimental del ZaidínConsejo Superior de Investigaciones Científicas (CSIC)GranadaSpain
  2. 2.Department of Earth SciencesUniversity of CambridgeCambridgeUK
  3. 3.Instituto Andaluz de Ciencias de la TierraConsejo Superior de Investigaciones Científicas (CSIC)/Universidad de GranadaGranadaSpain

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