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Ab initio study of the Cr2AlC (0001) surface
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2006 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 88, no 16Article in journal (Refereed) Published
Abstract [en]

Using an ab initio total energy method, we have calculated the surface energy and surface stress of Cr2AlC (0001) with the configuration of the top layer as Al [(0001)(Al)], Cr [(0001)(Cr)], and C [(0001)(C)] atoms, respectively. Both the surface energy and surface stress of (0001)(Cr) are very close to (0001)(C). While those of (0001)(Al) are the lowest, suggesting that this surface configuration is the most stable one. Furthermore, the interplanar relaxation does not have any obvious effect on the surface energy, while the surface stress decreased dramatically under layer relaxation. The Cr-C bond length in the surface layer contracted by > 5%, and the bond contraction for Cr-Al is < 1.5%, showing that the bond strength in the surface layer is higher than that in the bulk region.

Place, publisher, year, edition, pages
2006. Vol. 88, no 16
Keyword [en]
molecular-dynamics, transition, cr, phases
URN: urn:nbn:se:kth:diva-15624DOI: 10.1063/1.2197938ISI: 000236969300039ScopusID: 2-s2.0-33646204680OAI: diva2:333666
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Ahuja, Rajeev
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