Ultra-pure metal halide particles

Details Ultra-pure metal halide particles Ultra-pure metal halide particles

1972-06-05

1976-04-06

Vertiz, Oscar R.

Compositions

Getters or gas or vapor generating materials for electric...

H01J 718, H01J 3520, H01K 156

Patent

active

039487938

ABSTRACT:
Compositions are described including free-flowing particles of controlled size of purified metal halides such as sodium iodide and mixtures of sodium iodide with scandium iodide. These ultra-pure metal halide particles are particularly useful as a vaporizable fill disposed within an arc tube of a high pressure electric discharge device. The preparation and identification of the coordination entity Na.sup.+ScI.sub.4 .sup.- (III) is also described. The apparatus for producing purified metal halides of accurately controlled particle size includes means for evaporating volatiles from the solid impure metal halide, melting the impure halide, passing hydrogen, hydrogen halide, hydrogen and halogen, or mixtures thereof through the halide, and then passing the molten halide through a vibrating discharge conduit or nozzle into an inert quenching atmosphere to form the particles of purified halide.

REFERENCES:
patent: 3234421 (1966-02-01), Reiling
patent: 3334261 (1967-08-01), Butler et al.
patent: 3388076 (1968-06-01), Lamborn
patent: 3514659 (1970-05-01), Gungle et al.
patent: 3558963 (1971-01-01), Hanneman et al.

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