Impact of intrinsic localized modes of atomic motion on materials properties

Details Impact of intrinsic localized modes of atomic motion on materials properties Impact of intrinsic localized modes of atomic motion on materials properties

2010-01-26

arxiv.org/abs/1001.4583v2

Acta Materialia 58 (2010) 2926-2935

Physics

Condensed Matter

Materials Science

34 pages, 11 figures

Scientific paper

10.1016/j.actamat.2010.01.021

Recent neutron and x-ray scattering measurements show intrinsic localized modes (ILMs) in metallic uranium and ionic sodium iodide. Here, the role ILMs play in the behavior of these materials is examined. With the thermal activation of ILMs, thermal expansion is enhanced, made more anisotropic, and, at a microscopic level, becomes inhomogeneous. Interstitial diffusion, ionic conductivity, the annealing rate of radiation damage, and void growth are all influenced by ILMs. The lattice thermal conductivity is suppressed above the ILM activation temperature while no impact is observed in the electrical conductivity. This complement of transport properties suggests that ILMs could improve thermoelectric performance. Ramifications also include thermal ratcheting, a transition from brittle to ductile fracture, and possibly a phase transformation in uranium.

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