Partial dislocations in the X-ray topography of as-grown hexagonal silicon carbide crystals

Dislocations visible in X-ray topographs of as-grown hexagonal silicon carbide Lely platelets and physical vapor transport process wafers extinguished as if they had Burgers vectors of 1/3〈 11 2 ̄ 0 〉. Under the electron microscope, beneath the resolution of X-ray topography, short lengths of these...

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Veröffentlicht in:Materials Science and Engineering. A 2001-11, Vol.87 (2), p.173-177
Hauptverfasser: Vetter, William M, Dudley, Michael
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Dudley, Michael
description Dislocations visible in X-ray topographs of as-grown hexagonal silicon carbide Lely platelets and physical vapor transport process wafers extinguished as if they had Burgers vectors of 1/3〈 11 2 ̄ 0 〉. Under the electron microscope, beneath the resolution of X-ray topography, short lengths of these dislocations were shown to consist of pairs of 1/3〈 10 1 ̄ 0 〉 Shockley partials spanning narrow ribbons of stacking fault. An unusual example of a b =1/3〈 11 2 ̄ 0 〉 dislocation in a Lely platelet visibly separated into its partials in an X-ray topograph was presented.
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subjects Condensed matter: structure, mechanical and thermal properties
Defects and impurities in crystals
microstructure
Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.)
DISLOCATIONS
Exact sciences and technology
Linear defects: dislocations, disclinations
NATIONAL SYNCHROTRON LIGHT SOURCE
NSLS
PARTICLE ACCELERATORS
Physics
Silicon carbide crystals
SILICON CARBIDES
Structure of solids and liquids
crystallography
TOPOGRAPHY
X-ray topographs
title Partial dislocations in the X-ray topography of as-grown hexagonal silicon carbide crystals
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