The Debye-Waller factor of stabilized delta-Pu

Details The Debye-Waller factor of stabilized delta-Pu The Debye-Waller factor of stabilized delta-Pu

2007-10-05

arxiv.org/abs/0710.1241v1

Journal of Alloys and Compounds 444-445, 268-270 (2007) (3 pages)

Physics

Condensed Matter

Materials Science

Presented at the conference Plutonium Futures - The Science 2006

Scientific paper

10.1016/j.jallcom.2006.10.031

The Debye-Waller factor has been calculated for stabilized delta-phase plutonium with 5% aluminum. A quasi-harmonic Born-von Karman force model with temperature dependent phonon frequencies was used to calculate the mean-square thermal atomic displacement from absolute zero to 800 K. Implementation of the observed anomalous softening of the long wavelength phonons with increasing temperature cannot account for the softening of the measured thermal parameter at high temperatures nor for its rather high value at low temperatures. The implications for diffraction measurements on delta-phase stabilized plutonium alloys are discussed.

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