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Stepwise hydration of high-quality synthetic smectite with various cations

Kenji Tamura, Hirohisa Y. Yamada and Hiromoto Nakazawa
Stepwise hydration of high-quality synthetic smectite with various cations
Clays and Clay Minerals (June 2000) 48 (3): 400-404

Abstract

Smectites synthesized from experiments at 5.5 GPa and 1500 degrees C are of high quality, crystals are large at >10 mu m, and the 2:1 layers may have a homogeneous charge distribution. Smectite was exchanged with various cations (Na (super +) , Li (super +) , K (super +) , Ca (super 2+) , and Mg (super 2+) ) 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 H (sub 2) O are time-dependent phenomena and relate to hydration and dehydration processes.


ISSN: 0009-8604
Coden: CLCMAB
Serial Title: Clays and Clay Minerals
Serial Volume: 48
Serial Issue: 3
Title: Stepwise hydration of high-quality synthetic smectite with various cations
Affiliation: Central Research Laboratory, Kawasaki, Japan
Pages: 400-404
Published: 200006
Text Language: English
Publisher: Clay Minerals Society, Clarkson, NY, United States
References: 16
Accession Number: 2000-054342
Categories: Geochemistry of rocks, soils, and sedimentsSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: National Institute for Research in Inorganic Materials, JPN, Japan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200018
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