溶融法によるα-Al_2O_3結晶の合成

概要

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This study of the crystallization of α-Al_2O_3 from the melt was undertaken to investigate the effect of adding substances to the melt, Al_2O_3-CaF_2-Na_3AlF_6 system as an accelerator. Compositions of the melt were decided in consideration of the phase diagram by P. P. Fedotjew. The accelerator was dropped into the melt in a small graphite crucible set in the electrode type furnace at temperatures, m. P. +70℃. After 20∿30min., the temperature was lowered slowly. The crystallized α-Al_2O_3 are in the form of plates crystallized. The X-Ray diffraction patterns has been shown that the plane of the plate is (0001) and the structure is identical with the natural α-Al_2O_3 crystal. It was found that the accelerators with high melting point and heavy specific gravity were effective on the crystal growth, and its ratio 1∿2% by weight to a melt was sufficient for optimum growth.
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