Abstract
An X-ray topographic study of helical line defects in Czochralski grown Gd 3Ga 5O 12 is described. Both the Lang transmission configuration and the double reflection method have been employed to characterize the strain field in and around the helices. From this study it is concluded that the helix is a dislocation of the prismatic, interstitial type which surrounds a helicoidal region of smaller lattice constant. The topographs also reveal an alignment of the helix loops with the crystal growth striae.
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