Title: Lattice Vibrations in Alpha-Uranium - Non-Linearity and Localization
Authors: MANLEY M.e.YETHIRAJ M.SINN H.VOLZ H.m.ALATAS A.LASHLEY J.c.HULTS W.l.LANDER GerardSMITH J.l.
Citation: Proceedings of Plutonium Futures - The Sciences 2006 - A Topical Conference on Plutonium and Actinides vol. UCRL-PROC-222342 p. 126-127
Publisher: U.S. Department of Energy by University of California, Lawrence Livermore National Laboratory
Publication Year: 2006
JRC N°: JRC35866
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC35866
Type: Contributions to Conferences
Abstract: Non-linearity refers to a situation where small perturbations cause large shifts in the excitation spectrum. By this definition the phonons in α-uranium are quite non-linear, the phonon DOS can soften by as much as 10% when the temperature changes by as little as 100 K [1]. Although thermal softening is an expected consequence of anharmonicity, α- uranium is unusual in that it does not show behavior typically associated with a strongly anharmonic solid. First, the elastic energy of expansion can only account for about 10% of the observed softening
JRC Institute:Institute for Transuranium Elements

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