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Shear properties of potassium chloride films on iron obtained using density functional theory
Michael Garvey1, Octavio J Furlong, M Weinert
1Department of Chemistry and Biochemistry, and Laboratory for Surface Studies, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA.
Abstract:
Density functional theory is used to calculate the shear strength of a thin KCl film grown epitaxially on an Fe(100) substrate. It is first demonstrated that the calculations accurately reproduce the experimental values of the shear moduli of bulk KCl. The method is then extended to calculating the shear properties of a three-layer slab of KCl on an Fe(100) substrate, where shear is found to take place at the KCl-Fe(100) interface and the KCl essentially moves as a rigid body. The resulting calculated values of the shear strength at zero pressure along the [linear span]10[linear span] (79.8 MPa) and [linear span]11[linear span] (70.3 MPa) directions are in excellent agreement with the experimentally measured value of 65 ± 5 MPa.
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