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Title: Direct Determination of Dislocation Sense of Closed-Core Threading Screw Dislocations using Synchrotron White Beam X-ray Topography in 4H Silicon Carbide

Abstract

Grazing-incidence synchrotron white beam x-ray topography images of closed-core threading screw dislocations in 4H silicon carbide appear as roughly elliptically shaped white features, with an asymmetric perimeter of dark contrast which is greatly enhanced on one side or other of the g vector. Ray-tracing simulations indicate that the relative position of the enhanced dark contrast feature reveals the sense of the closed-core screw dislocation. Dislocation senses so obtained were validated using back-reflection images recorded with small Bragg angle. Therefore, the sense of the closed-core threading screw dislocations can be unambiguously revealed using either grazing-incidence or 'small Bragg angle' back-reflection synchrotron white beam x-ray topography.

Authors:
;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
959623
Report Number(s):
BNL-82609-2009-JA
Journal ID: ISSN 0003-6951; APPLAB; TRN: US1005767
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 91
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; BRAGG REFLECTION; DISLOCATIONS; SCREW DISLOCATIONS; SILICON CARBIDES; SYNCHROTRONS; TOPOGRAPHY; national synchrotron light source

Citation Formats

Chen,Y., and Dudley, M. Direct Determination of Dislocation Sense of Closed-Core Threading Screw Dislocations using Synchrotron White Beam X-ray Topography in 4H Silicon Carbide. United States: N. p., 2007. Web. doi:10.1063/1.2793705.
Chen,Y., & Dudley, M. Direct Determination of Dislocation Sense of Closed-Core Threading Screw Dislocations using Synchrotron White Beam X-ray Topography in 4H Silicon Carbide. United States. doi:10.1063/1.2793705.
Chen,Y., and Dudley, M. Mon . "Direct Determination of Dislocation Sense of Closed-Core Threading Screw Dislocations using Synchrotron White Beam X-ray Topography in 4H Silicon Carbide". United States. doi:10.1063/1.2793705.
@article{osti_959623,
title = {Direct Determination of Dislocation Sense of Closed-Core Threading Screw Dislocations using Synchrotron White Beam X-ray Topography in 4H Silicon Carbide},
author = {Chen,Y. and Dudley, M.},
abstractNote = {Grazing-incidence synchrotron white beam x-ray topography images of closed-core threading screw dislocations in 4H silicon carbide appear as roughly elliptically shaped white features, with an asymmetric perimeter of dark contrast which is greatly enhanced on one side or other of the g vector. Ray-tracing simulations indicate that the relative position of the enhanced dark contrast feature reveals the sense of the closed-core screw dislocation. Dislocation senses so obtained were validated using back-reflection images recorded with small Bragg angle. Therefore, the sense of the closed-core threading screw dislocations can be unambiguously revealed using either grazing-incidence or 'small Bragg angle' back-reflection synchrotron white beam x-ray topography.},
doi = {10.1063/1.2793705},
journal = {Applied Physics Letters},
number = ,
volume = 91,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}