Title: Intrinsically Localized Vibrations and the Mechanical Properties of Alpha-uranium
Authors: MANLEY M. E.YETHIRAJ M.SINN H.VOLZ H. M.ALATAS A.LASHLEY J. C.HULTS W. L.LANDER G.h.THOMAS D. J.SMITH J. L.
Citation: JOURNAL OF ALLOYS AND COMPOUNDS vol. 444-445 p. 129-132
Publisher: ELSEVIER SCIENCE SA
Publication Year: 2007
JRC Publication N°: JRC40099
ISSN: 0925-8388
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC40099
DOI: 10.1016/j.jallcom.2006.09.137
Type: Contributions to Conferences
Abstract: Recent experiments have indicated that the high-temperature properties of alpha-uranium may be strongly influenced by the formation of randomly distributed intrinsically localized vibrational modes, just a few atoms across in size. One observation was a loss of mechanical ductility that coincided with the formation of the intrinsically localized mode (ILM). Here, we consider this observation in more detail. In particular, we use the anisotropic thermal expansion behaviour to estimate the strains associated with each ILM and consider the implications for the forces between ILMs and the defects responsible for mechanical deformation. In the process we also suggest that an unusual transition from positive to negative thermal expansion along the [0 1 0] direction may be caused by the formation of ILMs.
JRC Institute:Institute for Transuranium Elements

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