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- W2186181877 abstract "3-10 4 cm -2 . Using collimated beams, lattice distortions around a dislocation are projected on the topograph with fine contrasts because only the region suffering from a certain misorientation satisfies the Bragg condition. In our previous study[2], typical strain contrasts around screw dislocations threading across a wafer were observed by weak beam topography in the Bragg-case geometry, revealing their senses of screw and depth profiles. In this report, we show further study on dislocation contrasts by the Laue-case X-ray topography using collimated beam. Experiment Samples were 4H-SiC wafers with 4°-off {0001} faces. In an ideal double-crystal topography, the first crystal as beam collimator and the second one as specimen are identical planes. Since the dislocation-free SiC crystals were unavailable at present, however, Si was used for the first crystal. The Laue-case diffractions with g 2200, 2020 and 0220, were observed using a beam of the wavelength 0.0657 nm collimated by a Si 224 asymmetric reflection. X-ray topographs were recorded on nuclear emulsion plates (Ilford L4)." @default.
- W2186181877 created "2016-06-24" @default.
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- W2186181877 date "2011-01-01" @default.
- W2186181877 modified "2023-09-27" @default.
- W2186181877 title "Threading dislocations in 4H-SiC observed by X-ray topography using collimated beams" @default.
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