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Relation Between Structural Disorder and Other Characteristics of Kaolinites and Dickites

Published online by Cambridge University Press:  02 April 2024

G. W. Brindley ,
Chih-Chun Kao ,
J. L. Harrison ,
M. Lipsicas  and
R. Raythatha
G. W. Brindley
Affiliation:
Mineral Sciences Building, The Pennsylvania State University, University Park, Pennsylvania 16802
Chih-Chun Kao*
Affiliation:
Mineral Sciences Building, The Pennsylvania State University, University Park, Pennsylvania 16802
J. L. Harrison
Affiliation:
Georgia Kaolin Research, Springfield, New Jersey 07081
M. Lipsicas*
Affiliation:
Schlumberger-Doll Research, Ridgefield, Connecticut 06877
R. Raythatha
Affiliation:
Schlumberger-Doll Research, Ridgefield, Connecticut 06877
*
1Present address: Department of Materials Engineering, Tatung Institute of Technology, Taipei, Taiwan, Republic of China.
2To whom all correspondence should be addressed.
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Abstract

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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 ν11 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.

Keywords

CrystallinityDickiteDisorderElectron paramagnetic resonanceFourier-transform infrared spectroscopyKaolinite
Type
Research Article
Information
Clays and Clay Minerals , Volume 34 , Issue 3 , June 1986 , pp. 239 - 249
Copyright
Copyright © 1986, The Clay Minerals Society

Footnotes

†

Deceased October 23, 1983.

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