Compositional Variation of the Phonon Dispersion Curves of bcc Fe-Ga Alloys

Journal Article · Sat Jan 01 00:00:00 EST 2005 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.72.180408· OSTI ID:978147

Zarestky, Jerel L ^[1]; Garlea, Vasile O ^[1]; Lograsso, Tom ^[2]; Schlagel, D. L. ^[2]; Stassis, C. ^[2]

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1. ORNL
2. Ames Laboratory

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 0 branch and, to a lesser extent, the L branch in the vicinity of = 2 3. The concentration dependence of the shear elastic constant C =1/2 C11?C12 , calculated from the slope of the T2 0 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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 978147
• Journal Information: Physical Review B, Vol. 72, Issue R; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALLOYS
ATOMS
NEUTRONS
PHONONS
SCATTERING
SHEAR
VELOCITY