The Observation of Helical Dislocations in Sapphire
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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Helical dislocations have been found in sapphire for the first time. Lang X-ray diffraction topographs, including a stereotopograph revealing such helical dislocations are shown. The Burgers vectors, in all cases, have been found to be parallel to the 2-1-10 directions as well as with the axes of the helical dislocations.