Imaging dislocation cores - The way forward

John Spence, H. R. Kolar, G. Hembree, C. J. Humphreys, J. Barnard, R. Datta, C. Koch, F. M. Ross, J. F. Justo

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Although the sub-angstrom resolution of the modern transmission electron microscope (TEM) has made major contributions to defect structure analysis in many fields (such as oxides, interfaces, nanoparticles and superconductors) it has yielded little direct information on the core structure of dislocations. We suggest that "forbidden reflection" lattice images recorded in an ultra-high vacuum TEM in projections normal to the dislocation line could provide interpretable images of cores at atomic resolution. These could answer crucial questions, such as the nature of kinks, core reconstruction and periodicity, the nature of obstacles, and help distinguish obstacle theories of kink motion from the secondary Peierls-valley Hirth-Lothe theory. We give experimental forbidden reflection images and a new image obtained from silicon under UHV conditions with atomically smooth surfaces, whose preparation did not anneal out all dislocations. We also show experimental coherent nanodiffraction patterns and scanning transmission electron microscope (STEM) images recorded with the beam parallel to the core, so that core reconstruction can be expected to introduce a "half-order" Laue zone ring. We discuss the contribution that energy-loss spectroscopy from dislocation cores can be expected to make if a nanoprobe beam is used.

Original languageEnglish (US)
Pages (from-to)4781-4796
Number of pages16
JournalPhilosophical Magazine
Volume86
Issue number29-31
DOIs
StatePublished - Oct 11 2006

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electron microscopes
ultrahigh vacuum
valleys
Dislocation
Imaging
periodic variations
energy dissipation
projection
nanoparticles
preparation
scanning
oxides
rings
defects
silicon
Microscope
spectroscopy
Energy
Nanoparticles
Rudolf Peierls

ASJC Scopus subject areas

  • Philosophy

Cite this

Spence, J., Kolar, H. R., Hembree, G., Humphreys, C. J., Barnard, J., Datta, R., ... Justo, J. F. (2006). Imaging dislocation cores - The way forward. Philosophical Magazine, 86(29-31), 4781-4796. https://doi.org/10.1080/14786430600776322

Imaging dislocation cores - The way forward. / Spence, John; Kolar, H. R.; Hembree, G.; Humphreys, C. J.; Barnard, J.; Datta, R.; Koch, C.; Ross, F. M.; Justo, J. F.

In: Philosophical Magazine, Vol. 86, No. 29-31, 11.10.2006, p. 4781-4796.

Research output: Contribution to journalArticle

Spence, J, Kolar, HR, Hembree, G, Humphreys, CJ, Barnard, J, Datta, R, Koch, C, Ross, FM & Justo, JF 2006, 'Imaging dislocation cores - The way forward', Philosophical Magazine, vol. 86, no. 29-31, pp. 4781-4796. https://doi.org/10.1080/14786430600776322
Spence J, Kolar HR, Hembree G, Humphreys CJ, Barnard J, Datta R et al. Imaging dislocation cores - The way forward. Philosophical Magazine. 2006 Oct 11;86(29-31):4781-4796. https://doi.org/10.1080/14786430600776322
Spence, John ; Kolar, H. R. ; Hembree, G. ; Humphreys, C. J. ; Barnard, J. ; Datta, R. ; Koch, C. ; Ross, F. M. ; Justo, J. F. / Imaging dislocation cores - The way forward. In: Philosophical Magazine. 2006 ; Vol. 86, No. 29-31. pp. 4781-4796.
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