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Contrast Mechanism in Superscrew Dislocation Images on Synchrotron Back-Reflection Topographs

Published online by Cambridge University Press:  10 February 2011

X. R. Huang
Affiliation:
Dept. of Materials Science & Engineering, SUNY at Stony Brook, NY 11794-2275
M. Dudley
Affiliation:
Dept. of Materials Science & Engineering, SUNY at Stony Brook, NY 11794-2275
W. M. Vetter
Affiliation:
Dept. of Materials Science & Engineering, SUNY at Stony Brook, NY 11794-2275
W. Huang
Affiliation:
Dept. of Materials Science & Engineering, SUNY at Stony Brook, NY 11794-2275
S. Wang
Affiliation:
Dept. of Materials Science & Engineering, SUNY at Stony Brook, NY 11794-2275
C. H. Carter Jr.
Affiliation:
Cree Research, Inc., 4600 Silicon Drive, Durham, NC 27703
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Abstract

The topographic contrast of superscrew dislocations in 6H-SiC crystals has been studied by synchrotron white-beam x-ray topography in the Bragg reflection geometry. The diffraction images of these dislocations are simulated using a ray-tracing method. Systematical simulations, which coincide with the dislocation images taken by back-and grazing-reflection topography, clearly reveal the kinematic diffraction mechanisms of the superscrew dislocation, and illustrate that synchrotron reflection topography is capable of providing accurate descriptions of the strain fields, the Burgers vector magnitudes, and the senses of these dislocations. In addition, our experiments and simulations demonstrate straightforwardly the relation between the topographic contrast and the lattice distortions, and therefore the general mechanisms underlying contrast formation of defect images in synchrotron reflection topographs are provided.

Type
Research Article
Copyright
Copyright © Materials Research Society 1998

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References

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Contrast Mechanism in Superscrew Dislocation Images on Synchrotron Back-Reflection Topographs
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