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The crystal perfection of a Czochralski-grown lithium niobate single crystal was investigated by the X-ray topographic technique. Pendellösung fringes as well as dislocations were observed in the crystal grown from the congruent melt in the [00.1] direction. The fringes, which have been interpreted using the dynamical theory of X-ray diffraction, indicate that such a boule is high in crystal quality.