Synthetic corundum - from melt containing asteriating cpds by pulling from melt having crystal-forming temp only in localised

Gem stones are produced having a Ti asteriating cpd. Uniformly distributed throughout their structure by (a) forming a melt of alumina and 1-3% wt. titania (b) forming a region on the melt surface with a temp. suitable for crystal formation (c) dipping a seed crystal into the melt, and (d) pulling t...

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Bibliographische Detailangaben
Hauptverfasser:	CASS SMITH,JAMES, ANTHONY KEIG,GEORGE, JAMES WATTS,JOHN MICHAEL
Format:	Patent
Sprache:	eng ; 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:	Gem stones are produced having a Ti asteriating cpd. Uniformly distributed throughout their structure by (a) forming a melt of alumina and 1-3% wt. titania (b) forming a region on the melt surface with a temp. suitable for crystal formation (c) dipping a seed crystal into the melt, and (d) pulling the product crystal. Cabochons can be obtained from any part of the crystal body in any desired size compatible with the need to have the base plane normal to the c-axis.