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
General Materials Science
Condensed Matter Physics
Physics and Astronomy (miscellaneous)
Metals and Alloys

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10.1080/01418617808239247

Cite this

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title = "On the thickness periodicity of atomic-resolution images of dislocation cores",

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.",

author = "John Spence and O'Keefe, \{M. A.\} and S. Iijima",

note = "Funding Information: The authors acknowledge useful discussions with Dr. A. Winter, Dr. 0. Krivanek and Professor J. M. Cowley. This work was supported by the Centre for Solid State Science at Arizona State University with assistance gratefully received from Mr. J. Wheatley and Mr. H. Kolar. We further acknowledge the support of NSF Grant No. EAR 77-00128 (M.A.O.).",

year = "1978",

month = oct,

doi = "10.1080/01418617808239247",

language = "English (US)",

volume = "38",

pages = "463--482",

journal = "Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties",

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T1 - On the thickness periodicity of atomic-resolution images of dislocation cores

AU - Spence, John

AU - O'Keefe, M. A.

AU - Iijima, S.

N1 - Funding Information: The authors acknowledge useful discussions with Dr. A. Winter, Dr. 0. Krivanek and Professor J. M. Cowley. This work was supported by the Centre for Solid State Science at Arizona State University with assistance gratefully received from Mr. J. Wheatley and Mr. H. Kolar. We further acknowledge the support of NSF Grant No. EAR 77-00128 (M.A.O.).

PY - 1978/10

Y1 - 1978/10

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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VL - 38

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JO - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties

JF - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties

IS - 4

ER -

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

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