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Stepwise Hydration of High-Quality Synthetic Smectite with Various Cations

Published online by Cambridge University Press:  28 February 2024

Kenji Tamura ,
Hirohisa Yamada  and
Hiromoto Nakazawa
Kenji Tamura*
Affiliation:
Central Research Laboratory, Kawasaki, Showa Denko K.K., 3-2 Chidori-cho, Kawasaki-ku, Kawasaki, Kanagawa, 210-0865 Japan
Hirohisa Yamada
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044 Japan
Hiromoto Nakazawa
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044 Japan
*
E-mail of corresponding author: tamurak2@kpl.sdk.co.jp
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Abstract

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Smectites synthesized from experiments at 5.5 GPa and 1500°C are of high quality, crystals are large at >10 μm, and the 2:1 layers may have a homogeneous charge distribution. Smectite was exchanged with various cations (Na+, Li+, K+, Ca2+, and Mg2+) and the hydration behavior of each sample was observed by an in situ powder X-ray diffraction method under precisely controlled relative humidity (RH). The smectite showed distinct stepwise (discontinuous) hydration versus RH. During the transition between two hydration states, the coexistence of the two states was observed. Randomly interstratified structures with one and two planes of H2O are time-dependent phenomena and relate to hydration and dehydration processes.

Keywords

Crystalline SwellingHydrationInterlayer CationSmectite
Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 3 , June 2000 , pp. 400 - 404
Copyright
Copyright © 2000, The Clay Minerals Society

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