Process for preparation of ultrapure thorium fluoride

Details Process for preparation of ultrapure thorium fluoride Process for preparation of ultrapure thorium fluoride

1982-01-28

1985-05-28

Miller, Edward A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

423252, C01F 1500

Patent

active

045199868

ABSTRACT:
The specification discloses a process for the preparation of ultrapure thorium fluoride (ThF.sub.4) having minimized water content and consequent maximized optical transmission of 10.6 micrometer radiation. First, thorium oxide is reacted with aqueous hydrofluoric acid to form a solid reaction product, which is then dried under controlled heating to form a hydrated thorium fluoride with a predetermined amount of hydration, namely ThF.sub.4.xH.sub.2 O where x is equal to 0.39. The hydrated thorium fluoride is exposed to a reactive atmosphere of hydrofluoric acid vapor and a selected fluoride compound in the gas phase at elevated temperature for a predetermined period of time. The reactive atmosphere removes substantially all of the water and water-derived impurities from the hydrated thorium fluoride to produce ultrapure thorium fluoride which is highly transmissive to 10.6 micrometer radiation.

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Pausewang et al., Z. Anorg. Allg. Chem., 369 (1-2), pp. 89-104, (1969).
Heitmann et al., Appl. Opt., 7 (2), 307-9, (1968).
Robinson et al., "Proceedings Electro-Optics/Laser 81 Conf. & Exh.", pp. 191-196, (Nov. 1981).

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