Abstract
The defects in single crystals of diacetylene (PTS) are studied by X-ray topography (Lang's method). Three types of isolated dislocations are observed and two kinds of Burgers vectors are determined. The first is the dislocation with the Burgers vector [001] and the slip plane (100), which has the straight part, which is the pure edge part. The second is the dislocation with the Burgers vector [211]. The third is the dislocation which is perpendicular to (100). In addition, the bundle of pure screw dislocations with the Burgers vector [010] and the planar defect are observed.
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