Crystals for ultraviolet light filters

Single-crystal – oriented-crystal – and epitaxy growth processes; – Processes of growth from liquid or supercritical state – Having growth from a solution comprising a solvent which is...

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117 3, 117 71, C30B 708

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active

057887659

ABSTRACT:
Crystals formed of a solid-solution of K.sub.2 Ni(SO.sub.4).sub.2 6H.sub.2 O provide very good materials for filtering ultraviolet light and will not deteriorate in temperatures as high as 110.degree. C. They are particularly useful in sensing devices which seek to identify the presence of ultraviolet light in the UV missile warning band.

REFERENCES:
patent: 2615797 (1952-10-01), Bruzau
patent: 4087511 (1978-05-01), Ropp
patent: 4517048 (1985-05-01), Shlichta
patent: 5499600 (1996-03-01), Okuno et al.
"Low temperature Opitical Absorption of Nickel Fluosilicate Crystals" by M. H. L. Pryce, G. Agnetta, T. Carofano, M. B. Palma-Vittorelli and M. U. Palma, Phil. Mag., 10, 477-496 (1964).
"Derivatographic Studies on Dehydration of Salt Hydrates and Their Deuterium Oxide Analogues, II" by N. Ray Chaudhuri and G. K. Pathak, Thermochimica Acta, 12 (1975) 71-79.
Studies on the Vibrational Spectrum of the SO.sub.4 =ion in Crystalline M.sub.2 'M" (SO.sub.4).sub.2 6H.sub.2 O Ananthanarayanan Journal of Chemical Physis vol. 48 #2 (573-581), Jan. 15, 1968.
Optical Absorption Spectra of Diluted Ni(KSO.sub.4).sub.2 6H.sub.2 O Single Crystal Baneyi Indian J. Physic 43 (108-109), 1969.

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