Quantitative assessment for cracking in oxide bulk single crystals during Czochralski growth: Development of a computer program for thermal stress analysis

N. Miyazaki, H. Uchida, T. Tsukada, T. Fukuda

研究成果: Article査読

28 被引用数 (Scopus)

抄録

A three-dimensional finite element computer program for thermal stress analyses was developed to deal with the cracking of trigonal class 3m oxide bulk single crystals, such as lithium niobate (LN) and lithium tantalate (LT) during Czochralski growth. A tensor transformation technique was used to obtain the elastic constant matrix and thermal expansion coefficient vector corresponding to an arbitrary pulling direction. The anisotropy of the elastic constants and thermal expansion coefficients as well as their temperature dependence were considered in the program. Using this program, we performed thermal stress analyses of LN bulk single crystals with three types of temperature distribution or the shape of crystal-melt interface. The analyses were performed both for the pulling directions of the a-axis [100] and c-axis [001]. The results show that the thermal stress is very sensitive to the shape of the crystal-melt interface, and that the thermal stress is lower in the c-axis pulling than in the a-axis pulling. The relation between the thermal stress and the cracking and the quality of a bulk single crystal is also discussed.

本文言語English
ページ(範囲)83-88
ページ数6
ジャーナルJournal of Crystal Growth
162
1-2
DOI
出版ステータスPublished - 1996 4

ASJC Scopus subject areas

  • 凝縮系物理学
  • 無機化学
  • 材料化学

フィンガープリント

「Quantitative assessment for cracking in oxide bulk single crystals during Czochralski growth: Development of a computer program for thermal stress analysis」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル