Compositional variation of the phonon dispersion curves of bcc Fe-Ga alloysPhysical Review B
AbstractInelastic 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.
Copyright OwnerAmerican Physical Society
Citation InformationJerel 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/