Decoherence in electron backscattering by kinked dislocations
A model is proposed that explains the origin of the bright contrast of dislocation walls consisting of edge dislocation dipoles in electron channelling contrast images (ECCI) of fatigued crystals, when the incident beam is parallel to the edge dislocations. The model is based on the assumption that...
| Asıl Yazarlar: | , , , |
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| Materyal Türü: | Journal article |
| Dil: | English |
| Baskı/Yayın Bilgisi: |
1999
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| _version_ | 1826256847122726912 |
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| author | Dudarev, S Ahmed, J Hirsch, P Wilkinson, A |
| author_facet | Dudarev, S Ahmed, J Hirsch, P Wilkinson, A |
| author_sort | Dudarev, S |
| collection | OXFORD |
| description | A model is proposed that explains the origin of the bright contrast of dislocation walls consisting of edge dislocation dipoles in electron channelling contrast images (ECCI) of fatigued crystals, when the incident beam is parallel to the edge dislocations. The model is based on the assumption that the contrast arises from the dislocation segments terminating the dipoles. These are modelled as screw-type kinks which scatter electrons. Scattering by randomly distributed kinks leads to the randomization of phase of transmitted and diffracted beams and suppresses the anomalous transmission of electrons. The predicted behaviour of electron-channeling contrast images agrees well with experimental observations. © 1999 International Union of Crystallography Printed in Great Britain - all rights reserved. |
| first_indexed | 2024-03-06T18:08:46Z |
| format | Journal article |
| id | oxford-uuid:024a8da5-16cf-4f22-8bb7-d9c9b12b6e34 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T18:08:46Z |
| publishDate | 1999 |
| record_format | dspace |
| spelling | oxford-uuid:024a8da5-16cf-4f22-8bb7-d9c9b12b6e342022-03-26T08:39:54ZDecoherence in electron backscattering by kinked dislocationsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:024a8da5-16cf-4f22-8bb7-d9c9b12b6e34EnglishSymplectic Elements at Oxford1999Dudarev, SAhmed, JHirsch, PWilkinson, AA model is proposed that explains the origin of the bright contrast of dislocation walls consisting of edge dislocation dipoles in electron channelling contrast images (ECCI) of fatigued crystals, when the incident beam is parallel to the edge dislocations. The model is based on the assumption that the contrast arises from the dislocation segments terminating the dipoles. These are modelled as screw-type kinks which scatter electrons. Scattering by randomly distributed kinks leads to the randomization of phase of transmitted and diffracted beams and suppresses the anomalous transmission of electrons. The predicted behaviour of electron-channeling contrast images agrees well with experimental observations. © 1999 International Union of Crystallography Printed in Great Britain - all rights reserved. |
| spellingShingle | Dudarev, S Ahmed, J Hirsch, P Wilkinson, A Decoherence in electron backscattering by kinked dislocations |
| title | Decoherence in electron backscattering by kinked dislocations |
| title_full | Decoherence in electron backscattering by kinked dislocations |
| title_fullStr | Decoherence in electron backscattering by kinked dislocations |
| title_full_unstemmed | Decoherence in electron backscattering by kinked dislocations |
| title_short | Decoherence in electron backscattering by kinked dislocations |
| title_sort | decoherence in electron backscattering by kinked dislocations |
| work_keys_str_mv | AT dudarevs decoherenceinelectronbackscatteringbykinkeddislocations AT ahmedj decoherenceinelectronbackscatteringbykinkeddislocations AT hirschp decoherenceinelectronbackscatteringbykinkeddislocations AT wilkinsona decoherenceinelectronbackscatteringbykinkeddislocations |