Soft crucible lowering down process for growing lithium fluoroaluminate crystals

A soft crucible lowering down method for growing lithium fluoroaluminate crystals features its low-temp solid-phase fluorination with NH4F as fluorinating agent and its soft crucible lowering down. Its technological steps include heating to 80-150 deg.C, low-temp pressure-reducing dewatering for 3-4...

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Bibliographische Detailangaben
Hauptverfasser:	CHAOEN HUANG, LISEN CHENG, ZHENYI FANG
Format:	Patent
Sprache:	eng
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:	A soft crucible lowering down method for growing lithium fluoroaluminate crystals features its low-temp solid-phase fluorination with NH4F as fluorinating agent and its soft crucible lowering down. Its technological steps include heating to 80-150 deg.C, low-temp pressure-reducing dewatering for 3-4 weeks, pressure-reducing fluorinating at about 300 deg.C for 24 hr, vacuum sintering at temp higher than 560 deg.C, and lowering down soft crucible made of Pt sheet with growth temp of 770-820 deg.c, temp gradient of 20-30 deg.C/cm, and growth speed of 5-10 mm/day.