Clays and Clay Minerals

, Volume 34, Issue 3, pp 239–249 | Cite as

Relation Between Structural Disorder and Other Characteristics of Kaolinites and Dickites

  • G. W. Brindley
  • Chih-Chun Kao
  • J. L. Harrison
  • M. Lipsicas
  • R. Raythatha


A suite of Georgia kaolinites, ranging from well-ordered to very poorly ordered samples, were studied to explore correlations between degree of structural disorder, geological environment, Fe3+ content, Fe3+ electron paramagnetic resonance (EPR) spectrum, and infrared (IR) hydroxyl-stretching band frequencies and bandwidths. Samples from different localities showed a wide range of disorder which appears to be related to differences in their geological environments. High iron content correlated strongly with low degree of order. The areas of both the I and E components of the EPR spectrum and the fractional I area correlated inversely with degree of order. Fourier-transform IR studies of kaolinites and dickites showed that (1) interlayer hydrogen bonding is weaker in dickite than in kaolinite; (2) frequency of the ν1 stretching band of the inner-surface hydroxyls increases sequentially from well-ordered kaolinite through the disordered structures to well-ordered dickite, which is consistent with a model for disorder based on vacancy displacement; and (3) the character and temperature dependence of the inner hydroxyl-stretching band is not compatible with the crystal structures of kaolinite and dickite as refined by Suitch and Young.

Key Words

Crystallinity Dickite Disorder Electron paramagnetic resonance Fourier-transform infrared spectroscopy Kaolinite 


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Copyright information

© The Clay Minerals Society 1986

Authors and Affiliations

  • G. W. Brindley
    • 1
  • Chih-Chun Kao
    • 1
  • J. L. Harrison
    • 2
  • M. Lipsicas
    • 3
  • R. Raythatha
    • 3
  1. 1.Mineral Sciences BuildingThe Pennsylvania State UniversityUniversity ParkUSA
  2. 2.Georgia Kaolin ResearchSpringfieldUSA
  3. 3.Schlumberger-Doll ResearchRidgefieldUSA

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