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Atomic-scale interlayer friction of gibbsite is lower than brucite due to interactions of hydroxyls

Hanaya Okuda, Kenji Kawai and Hiroshi Sakuma
Atomic-scale interlayer friction of gibbsite is lower than brucite due to interactions of hydroxyls
American Mineralogist (August 2023) 108 (8): 1476-1482

Abstract

To investigate the role of atomic-scale structure on the frictional properties of gibbsite, a dioctahedral-type aluminum hydroxide, we calculated the atomic-scale interlayer shear properties using the first-principles method based on density functional theory. We found that the presence of vacant sites within the octahedral sheet of gibbsite enables hydroxyls to move to more stable positions and reduce the repulsive force, leading to a lower atomic-scale shear stress of gibbsite compared with brucite, a trioctahedral-type magnesium hydroxide. We also estimated the macroscopic single-crystal friction coefficient of gibbsite with the assumption that only the atomic-scale interlayer friction controls macroscopic friction. The estimated single-crystal friction coefficient for gibbsite is 0.36(6), which is clearly lower than the experimentally obtained friction coefficient of the powdered gouge of gibbsite (0.74). This difference between the interlayer friction coefficient and gouge friction coefficient suggests the presence of additional mechanisms that affect the frictional strength, such as microstructures within a fault gouge.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 108
Serial Issue: 8
Title: Atomic-scale interlayer friction of gibbsite is lower than brucite due to interactions of hydroxyls
Affiliation: University of Tokyo, School of Science, Department of Earth and Planetary Science, Tokyo, Japan
Pages: 1476-1482
Published: 202308
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 35
Accession Number: 2023-053887
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: National Institute for Materials Science, JPN, Japan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2023, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2023
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