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Deviations from Vegard's law in ternary III-V alloys

Murphy, S. T.; Chroneos, A.; Jiang , C.; Schwingenschlögl, U. and Grimes, R. W. (2010). Deviations from Vegard's law in ternary III-V alloys. Physical Review B, 82(7) 073201.

URL: http://prb.aps.org/abstract/PRB/v82/i7/e073201
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1103/PhysRevB.82.073201
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Abstract

Vegard's law states that, at a constant temperature, the volume of an alloy can be determined from a linear interpolation of its constituent's volumes. Deviations from this description occur such that volumes are both greater and smaller than the linear relationship would predict. Here we use special quasirandom structures and density functional theory to investigate such deviations for MxN1-xAs ternary alloys, where M and N are group III species (B, Al, Ga, and In). Our simulations predict a tendency, with the exception of AlxGa1-xAs, for the volume of the ternary alloys to be smaller than that determined from the linear interpolation of the volumes of the MAs and BAs binary alloys. Importantly, we establish a simple relationship linking the relative size of the group III atoms in the alloy and the predicted magnitude of the deviation from Vegard's law.

Item Type: Journal Article
Copyright Holders: 2010 The American Physical Society
ISSN: 1098-0121
Extra Information: 4 pp.
Academic Unit/Department: Mathematics, Computing and Technology > Engineering & Innovation
Item ID: 35204
Depositing User: Alexander Chroneos
Date Deposited: 08 Nov 2012 10:28
Last Modified: 08 Nov 2012 10:28
URI: http://oro.open.ac.uk/id/eprint/35204
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