Process for chemical vapor purification of group IIIA metal fluorides
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United States of America Patent
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Aug 17, 1993
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N/A
app pub date -
Jan 31, 1991
filing date -
Jan 31, 1991
priority date (Note) -
Expired
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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.
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