Impact of intrinsic localized modes of atomic motion on materials properties

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,...

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Bibliographic Details
Published in:Acta materialia 2010-05, Vol.58 (8), p.2926-2935
Main Author: Manley, M.E.
Format: Article
Language:English
Subjects:
ANNEALING
Applied sciences
DIFFUSION
ELECTRIC CONDUCTIVITY
Exact sciences and technology
INTERSTITIALS
Intrinsic localized modes
IONIC CONDUCTIVITY
MATERIALS SCIENCE
Mechanical properties
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
NEUTRONS
PHASE TRANSFORMATIONS
Point defects
RADIATIONS
RATCHETING
SCATTERING
SODIUM IODIDES
THERMAL CONDUCTIVITY
THERMAL EXPANSION
TRANSPORT
URANIUM
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Summary: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 at 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.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2010.01.021