On the thickness periodicity of atomic-resolution images of dislocation cores

John Spence; M. A. O'Keefe; S. Iijima

doi:10.1080/01418617808239247

On the thickness periodicity of atomic-resolution images of dislocation cores

John Spence, M. A. O'Keefe, S. Iijima

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

Experimental conditions needed to obtain atomic-resolution images of dislocation cores are discussed. Experimental and computer-simulated images are used to show that, to a limited but useful resolution, these images are periodic functions of the specimen thickness as a consequence of dynamical scattering. Useful images may therefore be obtained from some specimens of sufficient thickness to allow surface relaxation effects to be neglected. End-on projections of stair-rod dislocations and dislocation dipoles are suggested for further study.

Original language	English (US)
Pages (from-to)	463-482
Number of pages	20
Journal	Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Volume	38
Issue number	4
DOIs	https://doi.org/10.1080/01418617808239247
State	Published - Oct 1978

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Materials Science(all)
Condensed Matter Physics
Physics and Astronomy (miscellaneous)
Metals and Alloys

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abstract = "Experimental conditions needed to obtain atomic-resolution images of dislocation cores are discussed. Experimental and computer-simulated images are used to show that, to a limited but useful resolution, these images are periodic functions of the specimen thickness as a consequence of dynamical scattering. Useful images may therefore be obtained from some specimens of sufficient thickness to allow surface relaxation effects to be neglected. End-on projections of stair-rod dislocations and dislocation dipoles are suggested for further study.",

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AU - O'Keefe, M. A.

AU - Iijima, S.

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N2 - Experimental conditions needed to obtain atomic-resolution images of dislocation cores are discussed. Experimental and computer-simulated images are used to show that, to a limited but useful resolution, these images are periodic functions of the specimen thickness as a consequence of dynamical scattering. Useful images may therefore be obtained from some specimens of sufficient thickness to allow surface relaxation effects to be neglected. End-on projections of stair-rod dislocations and dislocation dipoles are suggested for further study.

AB - Experimental conditions needed to obtain atomic-resolution images of dislocation cores are discussed. Experimental and computer-simulated images are used to show that, to a limited but useful resolution, these images are periodic functions of the specimen thickness as a consequence of dynamical scattering. Useful images may therefore be obtained from some specimens of sufficient thickness to allow surface relaxation effects to be neglected. End-on projections of stair-rod dislocations and dislocation dipoles are suggested for further study.

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