Engineering self-organising helium bubble lattices in tungsten

Research output: Contribution to journalArticle

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Abstract

The self-organisation of void and gas bubbles in solids into superlattices is an intriguing nanoscale phenomenon. Despite the discovery of these lattices 45 years ago, the atomistics behind the ordering mechanisms responsible for the formation of these nanostructures are yet to be fully elucidated. Here we report on the direct observation via transmission electron microscopy of the formation of bubble lattices under He ion bombardment. By careful control of the irradiation conditions, it has been possible to engineer the bubble size and spacing of the superlattice leading to important conclusions about the significance of vacancy supply in determining the physical characteristics of the system. Furthermore, no bubble lattice alignment was observed in the <111> directions pointing to a key driving mechanism for the formation of these ordered nanostructures being the two-dimensional diffusion of self-interstitial atoms.
Original languageEnglish
Article number7724
Number of pages8
JournalScientific Reports
Volume7
Early online date10 Aug 2017
DOIs
Publication statusPublished - 10 Aug 2017

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organizing
tungsten
bubbles
helium
engineering
engineers
superlattices
bombardment
voids
interstitials
alignment
spacing
transmission electron microscopy
irradiation
gases
atoms
ions

Cite this

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title = "Engineering self-organising helium bubble lattices in tungsten",
abstract = "The self-organisation of void and gas bubbles in solids into superlattices is an intriguing nanoscale phenomenon. Despite the discovery of these lattices 45 years ago, the atomistics behind the ordering mechanisms responsible for the formation of these nanostructures are yet to be fully elucidated. Here we report on the direct observation via transmission electron microscopy of the formation of bubble lattices under He ion bombardment. By careful control of the irradiation conditions, it has been possible to engineer the bubble size and spacing of the superlattice leading to important conclusions about the significance of vacancy supply in determining the physical characteristics of the system. Furthermore, no bubble lattice alignment was observed in the <111> directions pointing to a key driving mechanism for the formation of these ordered nanostructures being the two-dimensional diffusion of self-interstitial atoms.",
author = "Harrison, {R. W.} and G. Greaves and Hinks, {J. A.} and Donnelly, {S. E.}",
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Engineering self-organising helium bubble lattices in tungsten. / Harrison, R. W.; Greaves, G.; Hinks, J. A.; Donnelly, S. E.

In: Scientific Reports, Vol. 7, 7724, 10.08.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Engineering self-organising helium bubble lattices in tungsten

AU - Harrison, R. W.

AU - Greaves, G.

AU - Hinks, J. A.

AU - Donnelly, S. E.

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Y1 - 2017/8/10

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AB - The self-organisation of void and gas bubbles in solids into superlattices is an intriguing nanoscale phenomenon. Despite the discovery of these lattices 45 years ago, the atomistics behind the ordering mechanisms responsible for the formation of these nanostructures are yet to be fully elucidated. Here we report on the direct observation via transmission electron microscopy of the formation of bubble lattices under He ion bombardment. By careful control of the irradiation conditions, it has been possible to engineer the bubble size and spacing of the superlattice leading to important conclusions about the significance of vacancy supply in determining the physical characteristics of the system. Furthermore, no bubble lattice alignment was observed in the <111> directions pointing to a key driving mechanism for the formation of these ordered nanostructures being the two-dimensional diffusion of self-interstitial atoms.

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