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Article
Compositional variation of the phonon dispersion curves of bcc Fe-Ga alloys
Physical Review B
  • Jerel L. Zarestky, Iowa State University
  • V. O. Garlea, Iowa State University
  • Thomas A. Lograsso, Iowa State University
  • Deborah L. Schlagel, Iowa State University
  • C. Stassis, Iowa State University
Document Type
Article
Publication Date
11-28-2005
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
Date Available
2013-09-23
File Format
application/pdf
Citation Information
Jerel L. Zarestky, V. O. Garlea, Thomas A. Lograsso, Deborah L. Schlagel, et al.. "Compositional variation of the phonon dispersion curves of bcc Fe-Ga alloys" Physical Review B Vol. 72 Iss. 18 (2005) p. 180408(R)
Available at: http://works.bepress.com/thomas_lograsso/115/