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Thermal vacancies in random alloys in the single-site mean-field approximation
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Materials Center Leoben Forschung GmbH, Austria. (ENHETEN STRUKTURER)
2016 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 93, no 13, 134115Article in journal (Refereed) PublishedText
Abstract [en]

A formalism for the vacancy formation energies in random alloys within the single-site mean-filed approximation, where vacancy-vacancy interaction is neglected, is outlined. It is shown that the alloy configurational entropy can substantially reduce the concentration of vacancies at high temperatures. The energetics of vacancies in random Cu0.5Ni0.5 alloy is considered as a numerical example illustrating the developed formalism. It is shown that the effective formation energy increases with temperature, however, in this particular system it is still below the mean value of the vacancy formation energy, which would correspond to the vacancy formation energy in a homogeneous model of a random alloy, such as given by the coherent potential approximation.

Place, publisher, year, edition, pages
American Physical Society , 2016. Vol. 93, no 13, 134115
National Category
Physical Sciences Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-186993DOI: 10.1103/PhysRevB.93.134115ISI: 000374938700002ScopusID: 2-s2.0-84964582906OAI: oai:DiVA.org:kth-186993DiVA: diva2:930503
Funder
Swedish Research Council
Note

Funding Details: ERC.

QC 20160524

Available from: 2016-05-24 Created: 2016-05-16 Last updated: 2016-05-24Bibliographically approved

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Ruban, Andrei V.
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