Document Type

Article

Publication Date

11-28-2005

Journal or Book Title

Physical Review B

Volume

72

Issue

18

First Page

180408(R)

DOI

10.1103/PhysRevB.72.180408

Abstract

Inelastic neutron scattering techniques have been used to measure the phonon dispersion curves of bcc Fe1−xGax (x=10.8, 13.3, 16.0, 22.5) alloys as a function of Ga concentration. The phonon frequencies of every branch were found to decrease significantly with increasing Ga concentration. The softening was most pronounced for the T2[ξξ0] branch and, to a lesser extent, the L[ξξξ] branch in the vicinity of ξ=2/3. The concentration dependence of the shear elastic constant C′=1∕2(C11−C12), calculated from the slope of the T2[ξξ0] branch, was found to agree with the results of sound velocity measurements. For the higher concentration sample measured, 22.5 at. % Ga, new branches appeared, an effect associated with the increase in the number of atoms per unit cell.

Comments

This article is from Physical Review B 72 (2005): 180408(R), doi:10.1103/PhysRevB.72.180408.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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