Cracking process at lineages in Czochralski-grown 36°-RY LiTaO3 ingots

Yutaka Ohno, Tomio Kajigaya, Kazutaka Osako, Toshio Kochiya

Research output: Contribution to journalArticlepeer-review

Abstract

Cracking process at lineages during the Czochralski (CZ) growth of 36°-RY lithium tantalate (LiTaO3) single crystals was examined. Twin lamellae on (1¯012) and (11¯02) were generated at lineages beneath the –Z’ surface of the ingots, via the dissociation of the dislocations composing the lineages. Two kinds of twin lamellae grew with the CZ growth towards the bottom of the ingots, forming the intersections nearly parallel to the growth direction. Cracking occurred at the intersections with developing the twin lamellae. The twinning accompanied with cracking took place when the diameter of the ingots was suddenly decreased. It is hypothesized that the decrease was introduced by an accidental fluctuation of growth temperature, and therefore, radial tensile stresses needed for twinning would be applied at the circumference of the ingots.

Original languageEnglish
Article number126228
JournalJournal of Crystal Growth
Volume570
DOIs
Publication statusPublished - 2021 Sep 15

Keywords

  • A1. Characterization
  • A1. Defects
  • A1. Etching
  • A1. X-ray topography
  • A2. Czochralski method
  • B1. Lithium compounds

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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