Intrinsically localized vibrations and the mechanical properties of α-uranium

Autor:	Harald Sinn, Ahmet Alatas, Jason C. Lashley, H. M. Volz, W. L. Hults, Dan J. Thoma, Michael Manley, G. H. Lander, J. L. Smith, Mohana Yethiraj
Rok vydání:	2007
Předmět:	Materials science Condensed matter physics Mechanical Engineering Metals and Alloys Thermal expansion Vibration Negative thermal expansion Mechanics of Materials Molecular vibration Materials Chemistry Deformation (engineering) Ductility Anisotropy Nonlinear Sciences::Pattern Formation and Solitons
Zdroj:	Journal of Alloys and Compounds. :129-132
ISSN:	0925-8388
DOI:	10.1016/j.jallcom.2006.09.137
Popis:	Recent experiments have indicated that the high-temperature properties of α-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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c6ab175e968521c3160f2fa74f48e393 https://doi.org/10.1016/j.jallcom.2006.09.137 Zobrazit plný text záznamu Full Text from ScienceDirect