Compositions – Light transmission modifying compositions – Inorganic crystalline solid
Patent
1977-11-10
1983-03-01
Sebastian, Leland A.
Compositions
Light transmission modifying compositions
Inorganic crystalline solid
423490, F21V 900
Patent
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.
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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.
Collins William C.
Imber Oscar
Klein Philipp H.
Schneider Irwin
Beers Robert F.
Ellis William T.
McDonnell Thomas E.
Sebastian Leland A.
The United States of America as represented by the Secretary of
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