Formation mechanism of twin boundaries in lithium tetraborate

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We investigated the relationship between crystal growth direction and twin boundary orientation in lithium tetraborate. We found that there are two twin boundary orientations, {1 0 0} and {1 1 2}, and that the twin boundary orientation depends on the growth interface orientation. Using the micro-pulling-down method, the tilting angle of a seed crystal containing a (0 1 0) twin boundary has a critical effect on controlling the twin boundary orientation. Only a (0 1 0) twin boundary forms in a growing crystal for tilting angles between 0° and 45°, whereas both (0 1 0) and (1 0 0) twin boundaries form when the tilting angle is 45°. Employing a periodic twin structure in a borate crystal may be useful for fabricating quasi-phase-matching structures since the twin boundary orientation could be controlled by selecting an appropriate growth direction.

Original languageEnglish
Pages (from-to)78-82
Number of pages5
JournalJournal of Crystal Growth
Issue number1
Publication statusPublished - 2011 Sept 15


  • A1. Growth models
  • A2. Growth from melt
  • B1. Borates
  • B2. Nonlinear optic materials


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