Process for chemical vapor purification of group IIIA metal fluorides
US5236690A · kind A · utility
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Key dates
| Filing date | Jan 31, 1991 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | Jan 31, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/12
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A chemical vapor purification process for preparing metal fluorides. The process involves melting a metal selected from the metals forming fluorides suitable for use in fluoride glass and thermodynamically partitionable from cation contaminants, for example aluminum, gallium, or indium. Chlorine, bromine, or iodine is bubbled through a stoichiometric excess of the melt, under reaction conditions selected to result in generation of a gaseous halide of the metal. The gaseous halide is then isolated from the melt and reacted with a gaseous fluorinating agent to form a solid fluoride of the metal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.