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Hydration Behavior of Na-Smectite Crystals Synthesized at High Pressure and High Temperature

Published online by Cambridge University Press:  28 February 2024

Hirohisa Yamada ,
Hiromoto Nakazawa ,
Hideo Hashizume ,
Shuichi Shimomura  and
Takashi Watanabe
Hirohisa Yamada
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1, Tsukuba, Ibaraki, 305 Japan
Hiromoto Nakazawa
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1, Tsukuba, Ibaraki, 305 Japan
Hideo Hashizume
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1, Tsukuba, Ibaraki, 305 Japan
Shuichi Shimomura
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1, Tsukuba, Ibaraki, 305 Japan
Takashi Watanabe
Affiliation:
Department of Geoscience, Joetsu University of Education, Yamayashiki, Joetsu, Niigata, 943 Japan
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Abstract

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Hydration behavior of Na-smectite crystals synthesized at a pressure of 5.5 GPa and temperatures of 1400°–1500°C was examined by X-ray powder diffraction at various relative humidities (RH) in the range of 0–100%. The basal spacing of the Na-smectite crystal increased stepwise with increase in RH. The reflections observed were only normal reflections of a single or dual hydration states of smectite. No irrational, intermediate, or asymmetrical reflections were observed. The simple hydration behavior, not known for natural smectite with fine particle sizes and low crystallinity, indicates that the Na-smectite crystals are as perfect as common inorganic crystals with an ordered structure.

Keywords

High-pressure experimentHydrationRelative humiditySmectite crystal
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 1 , February 1994 , pp. 77 - 80
Copyright
Copyright © 1994, Clay Minerals Society

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