Anomalous Ion Accelerated Bulk Diffusion of Interstitial Nitrogen

Abrasonis, G.; Möller, W.; Xin, Xin

doi:10.1103/physrevlett.96.065901

Cited by 55 publications

(67 citation statements)

References 21 publications

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“…These observations combined with previous nonequilibrium ILM creation experiments [11,12] lend some support to the idea that radiation generated ILMs could enhance or at least influence kinetic processes [22,26]. The mechanical deformability of uranium is diminished with the appearance of ILMs, but this is not caused by the interaction of ILMs with dislocations or twins.…”

Section: Discussionsupporting

confidence: 69%

Impact of intrinsic localized modes of atomic motion on materials properties

Manley

2010

Acta Materialia

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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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Section: Discussionsupporting

confidence: 69%

Impact of intrinsic localized modes of atomic motion on materials properties

Manley

2010

Acta Materialia

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“…The understanding of the mechanism could help to explain and classify various athermal atomic transport processes known in the literature such as superdiffusion on solid surfaces 5,14,15,24 , quantum diffusion 4,5,23,32 , transient enhanced diffusion and intermixing 17,31 , transient cluster burrowing 22 , ultrafast adatom island nucleation 24 , coherent ballistic displacement of atoms 16 , the cooperative enhancement of surface roughening 66 , the facilitated intermixing near step edges 67 or the superdiffusive mixing in plastically deformed solids 69 .…”

Section: Discussionmentioning

confidence: 99%

“…During few of these processes no direct external forced conditions haven been applied, or the athermal process occurs beyond the spatial range of the external stimulus 16,17,24,31,66 . One can classify them as selforganized facilitated transient atomic transport processes which lead to superdiffusion due to still unknown or not clearly established reasons.…”

Section: Discussionmentioning

confidence: 99%

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Self-organized transient facilitated atomic transport in Pt∕Al(111)

Süle

2008

The Journal of Chemical Physics

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During the course of atomic transport in a host material, impurity atoms need to surmount an energy barrier driven by thermodynamic bias or at ultra-low temperatures by quantum tunneling. In the present article we demonstrate using atomistic simulations that at ultra-low temperature transient inter-layer atomic transport is also possible without tunneling when the Pt/Al(111) impurity/host system self-organizes itself spontaneously into an intermixed configuration. No such extremely fast athermal concerted process has been reported before at ultra low temperatures. The outlined novel transient atomic exchange mechanism could be of general validity. We find that the source of ultra-low temperature heavy particle barrier crossing is intrinsic and no external bias is necessary for atomic intermixing and surface alloying in Pt/Al although the dynamic barrier height is few eV. The mechanism is driven by the local thermalization of the Al(111) surface in a selforganized manner arranged spontaneously by the system without any external stimulus. The core of the short lived thermalized region reaches the local temperature of ∼ 1000 K (including few tens of Al atoms) while the average temperature of the simulation cell is ∼ 3 K. The transient facilitated intermixing process also takes place with repulsive impurity-host interaction potential leading to negative atomic mobility hence the atomic injection is largely independent of the strength of the impurity-surface interaction. We predict that similar exotic behaviour is possible in other materials as well.

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“…However, it has been proposed that anharmonic longitudinal vibrations, so called "discrete breathers," can dramatically enhance N atom migration in steels. 118 Electronic excitations associated with irradiation can naturally also cause photon emission when the electrons decay to lower-energy states. In materials with a band gap, the photons can travel far from the impact site.…”

Section: A Production Of Defects In Bulk Targetsmentioning

confidence: 99%

Ion and electron irradiation-induced effects in nanostructured materials

Krasheninnikov¹,

Nordlund²

2010

Journal of Applied Physics

946

591

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A common misconception is that the irradiation of solids with energetic electrons and ions has exclusively detrimental effects on the properties of target materials. In addition to the well-known cases of doping of bulk semiconductors and ion beam nitriding of steels, recent experiments show that irradiation can also have beneficial effects on nanostructured systems. Electron or ion beams may serve as tools to synthesize nanoclusters and nanowires, change their morphology in a controllable manner, and tailor their mechanical, electronic, and even magnetic properties. Harnessing irradiation as a tool for modifying material properties at the nanoscale requires having the full microscopic picture of defect production and annealing in nanotargets. In this article, we review recent progress in the understanding of effects of irradiation on various zero-dimensional and one-dimensional nanoscale systems, such as semiconductor and metal nanoclusters and nanowires, nanotubes, and fullerenes. We also consider the two-dimensional nanosystem graphene due to its similarity with carbon nanotubes. We dwell on both theoretical and experimental results and discuss at length not only the physics behind irradiation effects in nanostructures but also the technical applicability of irradiation for the engineering of nanosystems.

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Anomalous Ion Accelerated Bulk Diffusion of Interstitial Nitrogen

Cited by 55 publications

References 21 publications

Impact of intrinsic localized modes of atomic motion on materials properties

Impact of intrinsic localized modes of atomic motion on materials properties

Self-organized transient facilitated atomic transport in Pt∕Al(111)

Ion and electron irradiation-induced effects in nanostructured materials

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