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|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|
|Type:||Articles in periodicals and books|
|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 Directorate:||Nuclear Safety and Security|
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