Phonon dispersion of Mo-stabilized γ -U measured using inelastic x-ray scattering
| Autor: | Per Söderlind, Debra L. Rosas, Nicholas P. Butch, Ayman Said, Z. E. Brubaker, R. J. Zieve, Jason R. Jeffries, Yaakov Idell, Michael Manley, Sheng Ran |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Condensed matter physics Phonon Scattering X-ray 02 engineering and technology Neutron scattering 021001 nanoscience & nanotechnology 01 natural sciences Phase (matter) Metastability 0103 physical sciences Dispersion (optics) 010306 general physics 0210 nano-technology Softening |
| Zdroj: | Physical Review B. 100 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We have measured the room-temperature phonon spectrum of Mo-stabilized $\gamma-$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 $\gamma-$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 $\gamma$-UMo are similar to those of body-centered cubic elemental metals. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|