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Clays and Clay Minerals

, Volume 56, Issue 2, pp 272–282 | Cite as

Quantitative phase analysis of bentonites by the rietveld method

  • K. UferEmail author
  • H. Stanjek
  • G. Roth
  • R. Dohrmann
  • R. Kleeberg
  • S. Kaufhold
Article

Abstract

Thirty six bentonite samples from 16 different locations were examined in order to demonstrate the applicability of a new Rietveld description approach for quantitative phase analysis. X-ray diffraction patterns of the bulk material were obtained and analyzed by the Rietveld method. The samples contain up to ten different minerals, with dioctahedral smectite as the major component. A model for turbostratic disorder of smectites was formulated inside a structure-description file of the Rietveld program BGMN. The quality of the refinements was checked using an internal standard mineral (10.0 or 20.0 wt.% corundum) and by cross-checking results with X-ray fluorescence (XRF) data. The corundum content was reproduced with only small deviations from the nominal values. A comparison of the chemical composition obtained by XRF and the composition as re-calculated from quantitative Rietveld results shows a satisfactory agreement, although X-ray amorphous components such as volcanic glasses were not considered. As a result of this study, the Rietveld method combined with the new structure model for turbostratic disorder has proven to be a suitable method for routine quantitative analysis of bentonites with smectites as the dominant clay minerals.

Key Words

Bentonite Quantification Rietveld Analysis Smectite 

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Copyright information

© The Clay Minerals Society 2008

Authors and Affiliations

  • K. Ufer
    • 1
    Email author
  • H. Stanjek
    • 2
  • G. Roth
    • 3
  • R. Dohrmann
    • 4
  • R. Kleeberg
  • S. Kaufhold
    • 4
  1. 1.TU Bergakademie FreibergInstitute of MineralogyFreibergGermany
  2. 2.Clay and Interface MineralogyRWTH Aachen UniversityAachenGermany
  3. 3.Institute of CrystallographyRWTH Aachen UniversityAachenGermany
  4. 4.BGR/LBEGHannoverGermany

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