Atomic Core Structures Associated to the Threading Dislocation with <11̄00> Burgers Vector and [0001] Line Direction in GaN

The edge dislocation in GaN has been investigated by means of atomistic computer simulation. It's core structure exhibits three configurations that are related to the location of the origin of displacements imposed to the atoms when generating the dislocation in the initial configuration. They...

Full description

Saved in:
Bibliographic Details
Published in:Japanese Journal of Applied Physics 2013-11, Vol.52 (11S), p.11
Main Authors: Béré, Antoine, Ruterana, Pierre, Chauvat, Marie-Pierre, Koulidiati, Jean
Format: Article
Language:English
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The edge dislocation in GaN has been investigated by means of atomistic computer simulation. It's core structure exhibits three configurations that are related to the location of the origin of displacements imposed to the atoms when generating the dislocation in the initial configuration. They are described by: (a) 8- and 4-coordinated channels (8/4 core); (b) 8-, 5-, and 5-coordinated channels (8/5/5 core); and (c) 9- and 5-coordinated channels (9/5 core). An additional configuration where the dislocation decomposes in two 8-coordinated channels a= 1/3 dislocations is also generated and it exhibits the lowest energy. This is in agreement with high resolution transmission electron microscopy observations and image simulations carried out on an asymmetric Σ7 [0001] tilt grain boundary in which only cores of elemental a type dislocations have been determined.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.52.11NG06