MANUFACTURE OF LITHIUM TANTALATE SINGLE CRYSTAL

PURPOSE:To obtain a single crystal free from coloration and cracks by carrying out a growth of the single crystal by the pulling up method from a melt of LiTaO3 in an irridium crucible in an inert gas atmosphere contg. a specified a amount of oxygen. CONSTITUTION:Powdered LiTaO3 is put into an irrid...

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Bibliographische Detailangaben
1. Verfasser:	ABE MITSUAKI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE APPARATUS THEREFOR CHEMISTRY CRYSTAL GROWTH ELECTRICITY 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:	PURPOSE:To obtain a single crystal free from coloration and cracks by carrying out a growth of the single crystal by the pulling up method from a melt of LiTaO3 in an irridium crucible in an inert gas atmosphere contg. a specified a amount of oxygen. CONSTITUTION:Powdered LiTaO3 is put into an irridium crucible to melt by by high-frequency heating. The fused substance is allowed to stand near the melting point and a seed crystal is brought into contact with the melted liquid under rotation to grow a single crystal by pulling up gradually. In this case, the growth of the single crystal is carried out in an inert gas atmosphere (e.g. nitrogen, argon or the like) contg. 0.5-2.5vol% of oxygen. By this method, the completeness and the quality of the crystal can be improved.