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The surface energy and stress of metals
Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland.
KTH Royal Inst Technol, Appl Mat Phys, Dept Mat Sci & Engn, SE-10044 Stockholm, Sweden.
Univ Djillali Liabes Sidi Bel Abbes, Lab Catalysis & React Syst, Sidi Bel Abbes 22000, Algeria.
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2018 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 674, p. 51-68Article in journal (Refereed) Published
Abstract [en]

We investigated surface properties of metals by performing first-principles calculations. A systematic database was established for the surface relaxation, surface energy (gamma), and surface stress (tau) for metallic elements in the periodic table. The surfaces were modeled by multi-layered slab structures along the direction of low-index surfaces. The surface energy gamma of simple metals decreases as the atomic number increases in a given group, while the surface stress tau has its minimum in the middle. The transition metal series show parabolic trends for both gamma and tau with a dip in the middle. The dip occurs at half-band filling due to a long-range Friedel oscillation of the surface charge density, which induces a strong stability to the Peierls-like transition. In addition, due to magnetic effects, the dips in the 3d metal series are shallower and deeper for gamma and tau respectively, than those of the 4d and 5d metals. The surface stress of the transition metals is typically positive, only Cr and Mn have a negative tau for the (100) surface facet, indicating that they are under compression. The light actinides have an increasing gamma trend according to the atomic number. The present work provides a useful and consistent database for the theoretical modelling of surface phenomena.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 674, p. 51-68
Keywords [en]
Surface relaxation, Surface energy, Surface stress, Density-functional theory calculations, Metals
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-356604DOI: 10.1016/j.susc.2018.03.008ISI: 000432759200009OAI: oai:DiVA.org:uu-356604DiVA, id: diva2:1236612
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research VINNOVA, 2014-03374Swedish Energy AgencyThe Swedish Foundation for International Cooperation in Research and Higher Education (STINT)Carl Tryggers foundation Available from: 2018-08-03 Created: 2018-08-03 Last updated: 2018-08-03Bibliographically approved

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Kádas, KrisztinaAhuja, RajeevJohansson, BörjeVitos, Levente

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