Photodichroic crystals

Compositions – Light transmission modifying compositions – Inorganic crystalline solid

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423490, F21V 900

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active

043754295

ABSTRACT:
The improvement of the electrolytic and additive methods of coloring alkali fluoride crystals comprising the step of selecting an alkali fluoride crystal having the impurities of between 0 and 5 ppmA of OH; between 0 and 50 ppmA of one or more alkaline earth cations, of which between 0 and 10 ppmA Mg.sup.++ and between 0 and 10 ppmA Ca.sup.++ ; between 0 and 50 ppmA of non-fluorine halide anions; between 0 and 10 ppmA of SiF.sub.6.sup.= ; between 0 and 30 ppmA of other ions; and the method of preparing these crystals which comprises converting the alkali fluoride to alkali hydrofluoride, crystallizing and vacuum drying the alkali hydrofluoride crystals, regenerating the alkali fluoride by expelling hydrogen fluoride, and crystallizing the alkali fluoride.

REFERENCES:
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patent: 2550173 (1951-04-01), Swinehart et al.
patent: 3238017 (1966-03-01), Yamaguchi et al.
patent: 3282641 (1966-11-01), Sfiligoj et al.
patent: 3476690 (1969-11-01), Carnall, Jr.
patent: 3565700 (1971-02-01), Root
patent: 3935302 (1976-01-01), Pastor et al.
Collins et al., "Additive and Electrolytic Coloration of NaF", Applied Phcs Letters, vol. 24, No. 9, pp. 403-404.
Voszka et al., Kristall und Technik, 8(12), 1973, pp. 1347 to 1356.
Stacey et al., Advances in Fluorine Chemistry, vol. 4, Butterworth, Inc., Washington, D.C. 1965, pp. 142 to 149.

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