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Clays and Clay Minerals

, Volume 34, Issue 3, pp 323–329 | Cite as

Quantification Curves for the X-Ray Powder Diffraction Analysis of Mixed-Layer Kaolinite/Smectite

  • Katsutoshi Tomita
  • Hidewo Takahashi
Article

Abstract

X-ray powder diffraction patterns for many interstratified kaolinite/glycolated smectites were calculated by changing combinations of probabilities and transition probabilities of two component layers. Reichweite = 0 and Reichweite = 1 structures were investigated. The calculated d-values were plotted, with PKS (the probability that a smectite layer succeeds a kaolin layer given that the first layer is a kaolinite layer) and PSK as the axes of coordinates. These d-values were then linked into equal d-value curves on a graph. Four equal d-value diagrams for mixed reflections ranging from 34.0 to 17.1 Å, from 8.5 to 7.2 Å, from 6.13 to 5.68 Å, and from 3.540 to 3.401 Å were constructed. Two examples of identifying natural kaolinite/smectite minerals using these diagrams are presented.

Key Words

Ethylene glycol Interstratification Kaolinite/smectite Mixed-layer quantification X-ray powder diffraction 

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Copyright information

© The Clay Minerals Society 1986

Authors and Affiliations

  • Katsutoshi Tomita
    • 1
  • Hidewo Takahashi
    • 2
  1. 1.Institute of Earth Sciences, Faculty of ScienceKagoshima UniversityKagoshimaJapan
  2. 2.Department of Geology, Faculty of EducationKagoshima UniversityKagoshimaJapan

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