EXAFS STUDY OF A QUITE RELAXED ZINC-BLENDE LATTICE : THE GaAsySb1-y ALLOY

1 December 1986

journal article
Published by EDP Sciences in Le Journal de Physique Colloques

Vol. 47 (C8) , C8-369
https://doi.org/10.1051/jphyscol:1986872

Abstract

EXAFS measurements above the K-edge of Ga, As and the LIII-edge of Sb in GaAsySby are performed. The analysis of data above the Ga K-edge, on both sides of the miscibility gap (0 ⩽ y ⩽ .11, .9 ⩽ y ⩽ 1), leads to nearest-neighbor (NN) distances around Ga atom. The distribution of cation-anion distances is bimodal (d(Ga-As) = 2.46 ± 02 Å, d (Ga-Sb) = 2.63 ± .01 Å) and very close to the PAULING-HUGGINS limit. This great relaxation of the zinc-blende structure is explained by using a Valence-Force-Field model (Keating) and searching for the configuration at which the elastic forces acting upon every atom vanish : both sublattices are distorded and multimodal second-neighbor distribution of distance is predicted, in agreement with the broadening of the corresponding peak of the radial distribution (NNN distances)

Keywords

ZINC

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