Abstract
Urea single crystals were grown by solution growth and melt growth by the Czochralski method. The perfection of the grown crystals was evaluated by X-ray topography. The crystal defects, especially dislocations, in the crystals were characterized by analysis of their images. As a result, the Burgers vectors of the dislocations in urea crystals were determined to be (001). Almost every long straight dislocation in the crystals was a type of screw dislocation.
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