Phonon dispersion of Mo-stabilized γ-U measured using inelastic x-ray scattering

Brubaker, Zach E.; Ran, Sheng; Said, A. H.; Manley, Michael E.; Söderlind, P.; Rosas, Debra; Idell, Yaakov; Zieve, Rena J.; Butch, Nicholas P.; Jeffries, J. R.

doi:10.1103/PhysRevB.100.094311

Title: Phonon dispersion of Mo-stabilized $γ$ -U measured using inelastic x-ray scattering

Journal Article · 30 September 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.100.094311 · OSTI ID:1570896

^[1]; Ran, Sheng ^[2]; Said, A. H. ^[3];

^[1]; Söderlind, P. ^[4]; Rosas, Debra ^[4]; Idell, Yaakov ^[4];

^[5]; Butch, Nicholas P. ^[2]; Jeffries, J. R. ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of California, Davis, CA (United States)

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. As a result, the elastic constants of γ-UMo are similar to those of body-centered cubic elemental metals.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Thermal Energy Transport under Irradiation (TETI); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1570896

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 9 Vol. 100; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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