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Effects of Octahedral-Iron Reduction and Swelling Pressure on Interlayer Distances in Na-Nontronite

Published online by Cambridge University Press:  02 April 2024

Jun Wu ,
P. F. Low  and
C. B. Roth
Jun Wu*
Affiliation:
Department of Agronomy, Purdue University, West Lafayette, Indiana 47907
P. F. Low
Affiliation:
Department of Agronomy, Purdue University, West Lafayette, Indiana 47907
C. B. Roth
Affiliation:
Department of Agronomy, Purdue University, West Lafayette, Indiana 47907
*
2Permanent address: Institute of Soil Science, Academia Sinica, Nanking, People's Republic of China.
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Abstract

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A new type of environmental chamber for X-ray diffraction was designed that could sustain elevated, internal pressures of nitrogen or any other gas under oxygen-free conditions and that allowed the positions of the specimen and edge aperture to be adjusted by remote control. It was used to determine the values of the interlayer spacing, λ, of nontronite from Garfield, Washington, in different stages of reduction at different values of Π, the swelling pressure of the nontronite. At equilibrium, Π was equal to the pressure under which water was expressed from the clay. Both partially and fully expanded layers were found to exist in the reduced nontronite, the fraction of partially expanded layers increasing with increasing Π and Fe2+/Fe3+, the ratio of Fe2+ to Fe3+ in octahedral sites. Also, λ for the partially expanded layers was found to depend on Fe2+/Fe3+ but not on Π, and λ for the fully expanded layers was found to depend on Π but not on Fe2+/Fe3+. These findings were interpreted to mean that the reduction of Fe affected the short-range interlayer forces, but not the long-range ones.

Keywords

Interlayer distanceIronNontroniteReductionSwelling pressureX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 37 , Issue 3 , June 1989 , pp. 211 - 218
Copyright
Copyright © 1989, The Clay Minerals Society

Footnotes

1

Journal paper 11,660, Purdue University Agricultural Station.

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