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...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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1999
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| _version_ | 1826264013231620096 |
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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.With apologies for using two beams instead of three! |
| first_indexed | 2024-03-06T20:01:01Z |
| format | Journal article |
| id | oxford-uuid:274c140f-5e24-4116-845e-7e14d377290e |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:01:01Z |
| publishDate | 1999 |
| record_format | dspace |
| spelling | oxford-uuid:274c140f-5e24-4116-845e-7e14d377290e2022-03-26T12:06:04ZDecoherence in electron backscattering by kinked dislocations.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:274c140f-5e24-4116-845e-7e14d377290eEnglishSymplectic 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.With apologies for using two beams instead of three! |
| 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 |