OBSERVATION OF DISLOCATIONS IN ALPHA-ARSENIC SINGLE CRYSTALS BY X-RAY DIFFRACTION TOPOGRAPHY.
NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF APPLIED CHEMISTRY
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X-ray diffraction topographs were obtained from large arsenic single crystals. The camera employed copper K alpha radiation from a microfocus tube and an oscillating assemble of Soller slits limited the beam divergence. Reflections of the type 11-2 and 2-20 primitive rhombohedral cell were used to characterize dislocation Burgers vectors. The technique has been applied to arsenic single crystals grown from the vapour and from the melt. The majority of dislocations were found to belong to Burgers vectors 110. Comparison has been made between dislocation etch pit patterns on 111 surfaces and X-ray topographs. Author