Crystal Research and Technology
Cryst. Res. Technol. 34 (1999) 817 - Abstract -

A. Miyazaki, H. Kimura, X. Jia*, K. Shimamura**, T. Fukuda**

National Research Institute for Metals, Tsukuba, Japan
*DEO, Rifu, Japan
**IMR, Tohoku University, Sendai, Japan

Comparison of Ba(B1-xAlx)2O4 Single Crystals on their Diameters

Small diameter crystals of Ba(B1-xAlx)2O4 were grown by Floating zone pulling down method and Micro-pulling down method to be compared with large diameter crystals grown by Czochralski method. While the Czochralski grown crystal was opaque, the crystal transparency was actually improved with the decrease of crystal diameter, i.e., the decrease of constitutional supercooling. The reason was the increase of temperature gradient caused by down-sizing of the crystal diameter deduced by down-sizing of the growth furnace. The adequate diameter for transparent crystal was determined depending on the Al content.

Keywords: melt growth, constitutional supercooling, transparent, opaque


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