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Phonon Dispersion of Mo-stabilized -γ-U measured using Inelastic X-ray Scattering



Z. E. Brubaker, Sheng NMN Ran, A. H. Said, M. E. Manley, P. Soderlind, D. Rosas, Y. Idell, R. J. Zieve, Nicholas Butch, J. R. Jeffries


We have measured the room-temperature phonon spectrum of Mo-stabilized γ−U. The dispersion curves show unusual softening near the H point, q=[1/2,1/2,1/2], which may derive from the metastability of the γ−U phase or from strong electron-phonon coupling. Near the zone center, the dispersion curves agree well with theory, though significant differences are observed away from the zone center. The experimental phonon density of states is shifted to higher energy compared to theory and high-temperature neutron scattering. The elastic constants of γ-UMo are similar to those of body-centered cubic elemental metals.
Physical Review B




Brubaker, Z. , Ran, S. , Said, A. , Manley, M. , Soderlind, P. , Rosas, D. , Idell, Y. , Zieve, R. , Butch, N. and Jeffries, J. (2019), Phonon Dispersion of Mo-stabilized -γ-U measured using Inelastic X-ray Scattering, Physical Review B, [online], (Accessed June 19, 2024)


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Created September 29, 2019, Updated October 12, 2021