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Physics and Chemistry of Minerals

, Volume 35, Issue 1, pp 49–58 | Cite as

A neutron diffraction study of alkali cation migration in montmorillonites

  • D. GournisEmail author
  • A. Lappas
  • M. A. Karakassides
  • D. Többens
  • A. Moukarika
Original Paper

Abstract

Neutron powder diffraction measurements on lithium and cesium saturated montmorillonite samples before and after heat treatment at 300°C are studied, in order to undertake a complete refinement of crystal structure and unravel the migration mechanism for the interlayer cations of Li or Cs. Rietveld analysis of the corresponding diffraction patterns finds that montmorillonite crystallizes in the C2/m space group with unit cell dimensions consistent with the size of the specific interlayer cation. We show that thermal treatment affects the two types of samples in a different way. This is with respect to their unit cell dimensions and the migration of Li from the 2b to the 2c clay lattice site, in constrast to the Cs positioning which remains effectively unchanged.

Keywords

Montmorillonite Neutron diffraction Lithium migration Infrared reflectance Hoffman Klemen effect 

Notes

Acknowledgments

The experiments at BENSC in Berlin were supported by the European Commission under the Access to Research Infrastructures Action of Human Potential Programme (contract: HPRI-CT-1999-00020).

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • D. Gournis
    • 1
    Email author
  • A. Lappas
    • 2
  • M. A. Karakassides
    • 1
  • D. Többens
    • 3
  • A. Moukarika
    • 4
  1. 1.Department of Materials Science and EngineeringUniversity of IoanninaIoanninaGreece
  2. 2.Institute of Electronic Structure and LaserFoundation for Research and Technology-HellasHeraklionGreece
  3. 3.Berlin Neutron Scattering CenterHahn-Meitner-InstitütBerlinGermany
  4. 4.Department of PhysicsUniversity of IoanninaIoanninaGreece

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