Friction on the atomic scale : an ultrahigh vacuum atomic force microscopy study on ionic crystals

Luthi, R. and Meyer, E. and Bammerlin, M. and Howald, L. and Haefke, H. and Lehmann, T. and Loppacher, C. and Guntherodt, H. J. and Gyalog, T. and Thomas, H.. (1996) Friction on the atomic scale : an ultrahigh vacuum atomic force microscopy study on ionic crystals. Journal of vacuum science & technology. B, Microelectronics and nanometer structures processing, measurement, and phenomena, Vol. 14, H. 2. pp. 1280-1284.

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Official URL: http://edoc.unibas.ch/dok/A5839477

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We performed atomic force microscopy in ultrahigh vacuum on the ionic crystal of KBr(001), The morphology and the tribological properties of this cleavage face are characterized and discussed, The local friction coefficient was extracted by means of the two-dimensional histogram technique. For loads below 3 nN a linear behavior was found between normal and lateral forces yielding a friction coefficient of less than 0.04, Ln this load regime, wearless friction is observed. For higher lends, the friction coefficient increases to a value of about 0.7-1.2, The corresponding topography images reveal the typical onset of wear, On the atomic scale a periodicity of 4.7 Angstrom was found which corresponds to the distance of equally charged ions on the KBr(001) surface. On this scale, the lateral force map exhibits the typical stick-slip phenomenon which is discussed in terms of a novel theoretical approach. (C) 1996 American Vacuum Society.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Meyer, Ernst
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Vacuum Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Sep 2012 07:18
Deposited On:14 Sep 2012 06:43

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