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Title: 引き下げ法によるLi2B4O7単結晶の育成とその評価
Other Titles: Growth of Li2B4O7 Single Crystals by a Pulling-Down Method
Authors: 北川, 高郎1 Browse this author
樋口, 幹雄2 Browse this author →KAKEN DB
小平, 紘平3 Browse this author
Authors(alt): Kitagawa, Takao1
Higuchi, Mikio2
Kodaira, Kohei3
Keywords: Li2B4O7
Single crystal
Pulling-down method
Issue Date: 1-Jul-1997
Publisher: Ceramic Society of Japan
Journal Title: Journal of the Ceramic Society of Japan
Journal Title(alt): 日本セラミックス協会学術論文誌
Volume: 105
Issue: 1223
Start Page: 616
End Page: 619
Publisher DOI: 10.2109/jcersj.105.616
Abstract: Bubble-free, transparent Li2B4O7 single crystals were grown by a newly developed pulling-down method. The use of a two-zone vertical furnace with a Pt-crucible realized a relatively steep temperature gradient of about 50°C/cm around the growth interface and a moderate gradient of about 13°C/cm below the interface, contributing to prevent grown crystals from cracking. Even at a pulling-down rate of 0.75mm/h, which is higher than that in the Czochralski growth, the formation of bubbles was effectively suppressed at a rotation rate of 25rpm. Any crystals grown along [110] direction involved no low-angle grain boundaries, but twinning was occasionally recognized. The dislocation density in the initial part of the crystal growth was found to be about 5×103/cm2 from an etch pit pattern, while X-ray topography of a vertical cross section revealed that the number of dislocation lines decreased as the growth proceeded.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 樋口 幹雄

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