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Distribution of Ca and Na Ions in Dioctahedral Smectites and Interstratified Dioctahedral Mica/Smectites

Published online by Cambridge University Press:  02 April 2024

Takashi Iwasaki  and
Takashi Watanabe
Takashi Iwasaki*
Affiliation:
Department of Geology, Faculty of Science, Kyushu University, Hakozaki, Fukuoka, 812 Japan
Takashi Watanabe*
Affiliation:
Department of Geology, Faculty of Science, Kyushu University, Hakozaki, Fukuoka, 812 Japan
*
1Present address: Government Industrial Research Institute, Tohoku, Nigatake 4-2-1, Sendai, 983, Japan.
2Present address: Joetsu University of Education, Yamayashiki 1, Joetsu, 943 Japan.
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Abstract

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The structures of 11 smectites and 2 interstratified mica/smectites containing mainly Ca2+ and Na+ as exchangeable cations in variable ratio were studied under a relative humidity of about 40%. Observed X-ray powder diffraction patterns were compared with diagrams calculated from interstratification models containing 15.2-Å Ca-smectite layers (C), 12.4-Å Na-smectite layers (N), and 10.0-Å mica layers (M) in various combinations. The smectites appear to be a random interstratification of component layers C and N, and display a tendency towards segregation. One of the interstratified minerals studied is a regular interstratification of C and M layers; the other is a regular interstratification of C, N, and M layers, in which N and C layers are randomly distributed in equal proportion and show a tendency towards segregation.

Keywords

DemixingExchangeable cationsInterstratified mica/smectiteRelative humiditySmectite, WaterX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 36 , Issue 1 , February 1988 , pp. 73 - 82
Copyright
Copyright © 1988, The Clay Minerals Society

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