Abstract

Mixed-type [a+c] dislocations can be identified in atomic-resolution high-angle annular dark-field scanning transmission electron microscope images of GaN viewed along [0001] by use of a Burgers loop analysis and by observation of the depth-dependent displacements associated with the Eshelby twist. These dislocations are found to be able to dissociate resulting in a fault that lies perpendicular to the dislocation glide plane. Consideration of the bonding that occurs in such a fault allows the dissociation reaction to be proposed, and the proposed fault agrees with the experimental images when kinks are incorporated into the model.

Details

Title
A dissociation mechanism for the [a+c] dislocation in GaN
Author
Nellist, P D 1 ; Hirsch, P B 1 ; Rhode, S 2 ; Horton, M K 3 ; Lozano, J G 1 ; Yasuhara, A 4 ; Okunishi, E 4 ; Zhang, S 2 ; S-L Sahonta 2 ; Kappers, M J 2 ; Humphreys, C J 2 ; Moram, M A 3 

 Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK 
 Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge, CB2 3QZ, UK 
 Department of Materials, Imperial College London, Exhibition Road, London, SW7 2AZ, UK 
 JEOL Ltd., EM Application Group, 1-2 Musashino 3-Chome, Akishima, 196-8558, Tokyo, Japan 
Publication year
2014
Publication date
Jun 2014
Publisher
IOP Publishing
ISSN
17426588
e-ISSN
17426596
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2576683824
Copyright
© 2014. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.