The Debye-Waller factor of stabilized δ-Pu

[摘要] 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 0 to OF 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. (c) 2006 Elsevier B.V. All rights reserved.

[发布日期] 2007-10-11

[效力级别]  Proceedings Paper

[关键词] metals;neutron scattering;diffraction