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Magnetism-driven anomalous surface alloying between Cu and Cr
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
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2009 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 94, no 17, 172507- p.Article in journal (Refereed) Published
Abstract [en]

Cu-Cr contact materials are widely used as medium- and high-voltage vacuum interrupters. The microstructure of these materials is critical in their performance: the finer structure they have, the better are their physical properties. A solid solution of Cu and Cr could significantly increase the performance of such contact materials. However, Cu and Cr are practically immiscible in the bulk phase. Based on first principles density functional theory we show here that the solubility of Cr in Cu is dramatically increased on Cu surfaces already at room temperature and Cu-Cr alloys are formed on both the Cu(111) and Cu(100) surfaces. We demonstrate that the origin of this phenomenon is the unique magnetic properties of Cr atoms near surfaces.

Place, publisher, year, edition, pages
2009. Vol. 94, no 17, 172507- p.
Keyword [en]
chromium alloys, copper, copper alloys, crystal microstructure, density functional theory, solid solutions, solubility, surface alloying, surface magnetism
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-129074DOI: 10.1063/1.3116649ISI: 000265738700046OAI: oai:DiVA.org:uu-129074DiVA: diva2:337544
Available from: 2010-08-06 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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Kádas, KrisztinaEriksson, OlleJohansson, BörjeVitos, Levente

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