PROCEDE DE FABRICATION D'UN COMPOSE MONOCRISTALLIN DU GROUPE IIIB-VB

When the growth of a single crystalline IIIb-Vb group compound is carried out employing the horizontal Bridgeman method or the gradient freeze method, it is likely that polycrystals will be grown, crystal defects will form, and the distribution of impurities will not be uniform, especially if the di...

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Bibliographische Detailangaben
1. Verfasser:	FUMIO ORITO
Format:	Patent
Sprache:	fre
Schlagworte:	AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE APPARATUS THEREFOR CHEMISTRY CRYSTAL GROWTH METALLURGY PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE REFINING BY ZONE-MELTING OF MATERIAL SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE SINGLE-CRYSTAL-GROWTH UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL
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Beschreibung
Zusammenfassung:	When the growth of a single crystalline IIIb-Vb group compound is carried out employing the horizontal Bridgeman method or the gradient freeze method, it is likely that polycrystals will be grown, crystal defects will form, and the distribution of impurities will not be uniform, especially if the diameter of the single crystal is large. In the present invention, the cooling rate of the melt is controlled in an inconstant manner. Namely, crystal growth is interrupted at least once and/or the cooling rate at an earlier growth period is controlled at a high value. From 40 to 65% of the total melt crystallizes at the time when 30% of the total time required for growth has elapsed. The high yield of a single crystal is attained according to the present invention.