Crystalline materials

Details Crystalline materials Crystalline materials

1973-10-15

1976-09-21

Padgett, Benjamin R.

Compositions

Inorganic luminescent compositions

Tungsten containing

23302R, 23303, 23304, 23305R, 350 2, 350311, G02B 520

Patent

active

039818187

ABSTRACT:
A composition of matter transparent to infrared rays and shock resistant which is a directionally grown, polycrystalline solidified melt of a eutectic composition comprising at least two components wherein the ratio of the index of refraction of one to the other is within the range of 1.2 to 1.0, the directionally oriented, polycrystalline mass is grown in a controlled manner by adding heat to the melt and removing the same from the solids during the solidification step, the amount of heat being added to the melt and conducted through the solidified melt being 10.sup.3 to 10.sup.5 times the latent heat of fusion of the eutectic mixture.

REFERENCES:
patent: 2498186 (1950-02-01), Stockbarger et al.
patent: 2642335 (1953-06-01), May et al.
patent: 2739045 (1956-03-01), Pfann
patent: 2966592 (1960-12-01), Vogl et al.
patent: 3002811 (1961-10-01), Johnson
patent: 3111088 (1963-11-01), Fisk

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