Defect Structures in LiNbO3 Single Crystals Grown by Czochralski Method : Dislocation Etch Pits Morphology

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J. Korean Ceram. Soc. > Volume 26(5); 1989 > Article

Journal of the Korean Ceramic Society 1989;26(5): 661.

Czochralski법으로 성장시킨 LiNbO3 단결정의 결함구조 : Dislocation Etch Pits Morphology

장동석, 오근호

한양대학교 무기재료공학과

Defect Structures in LiNbO3 Single Crystals Grown by Czochralski Method : Dislocation Etch Pits Morphology

ABSTRACT

The defect structure in LiNbO3 single crystals grown by Czochralski method from the congruently melting composition were investigated. Chemical etching patterns were studied in x-plane, z-plane, and major cleavage plane, respectively, dislocation density was higher at the periphery of crystals than at the center because the thermal stress due to radial temperature gradient had a main effect on it, as compared with dislocations formed from the solid-liquid interface. Many dislocation lineages were arranged along several directions.