METHOD FOR CONTACTING SEED CRYSTAL OR SUBSTRATE

Japanese Patent JPS5957984

A

PURPOSE:To detect accurately and easily the moment when a seed crystal or substrate contacts with a molten starting material over a long time while causing little fatigue to an observer by measuring resistance at the moment when the seed crystal or substrate contacts with the molten starting material. CONSTITUTION:Platinum wires 9, 10 are insulated from each other by an air layer 12 until a seed crystal or substrate 8 contacts with a molten starting material 1, and a resistance meter 11 indicates the maximum resistance. When the seed crystal or substrate 8 lowers and contacts with the melt 1, the wires 9, 10 are connected with the melt 1 and a crucible 2 in-between, and the resistance value of the meter 11 reduces remarkably by the value corresponding to the resistance of the air 12 because Bi12SiO20 has low resistance in the molten state. While lowering the seed crystal or substrate 8, the resistance value of the meter 11 is read to detect the moment when the resistance value reduces suddenly. By the detection the moment when the seed crystal or substrate 8 contacts with the melt 1 can be detected accurately and momentarily.

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NISHIURA YOUZOU
TADA KOUJI
TATSUMI MASAMI
NISHIWAKI YOSHIKAZU

JP17204082A

April 03, 1984

September 29, 1982

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SUMITOMO ELECTRIC INDUSTRIES

C30B15/00; C30B15/20; C30B29/32; C30B29/34; (IPC1-7): C30B15/00; C30B29/32; C30B29/34

Hideki Aoki

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