Process for the preparation of high purity alpha mercuric iodide

Details Process for the preparation of high purity alpha mercuric iodide Process for the preparation of high purity alpha mercuric iodide

1984-02-15

1986-04-08

Straub, Gary P.

Chemistry of inorganic compounds

Halogen or compound thereof

Binary compound containing metal

203 91, C30B 2912

Patent

active

045812187

ABSTRACT:
The invention relates to a process for the preparation of high purity alpha mercuric iodide for use as a starting material source for the growth of monocrystals usable for nuclear detection.
This process consists of synthesizing alpha mercuric iodide and subjecting the thus obtained alpha mercuric iodide to a purification treatment consisting of at least one vacuum distillation stage at a temperature of at least 255.degree. C.
For this distillation stage, use is made of a reactor having three zones kept at different temperatures. The iodide to be purified is introduced into the first zone kept at at least 255.degree. C. The mercuric iodide vapors pass through the second zone kept at a higher temperature before being condensed in the air-cooled third zone.

REFERENCES:
patent: 3969182 (1976-07-01), Carlston
patent: 4091084 (1978-05-01), Schieber
patent: 4347230 (1982-08-01), Nicolau
M. Schieber et al., "Purification, Growth and Characterization of Alpha Mercuric-Iodide Crystals for Gamma-Ray Detection", Journal of Crystal Growth, 24/25, (1974) pp. 205-211.
Clara E. Miller, "The Effect of Mercuric Iodide and Ammonium Chloride on Glass", J. Physical Chemistry, (1931) pp. 2985-2992.
Muheim et al, "Spark Source Mass Spectrographic Analyses of .alpha.-HgI.sub.2 : Comparison of Samples from Different Laboratories", Nuclear Instruments and Methods, 213 (1983) pp. 39-42.
Y. F. Nicolau, "Technology of High Purity HgI.sub.2 ", Nucl. Instrum. Methods Phys. Res., 213(1), 13-18 (1983).
Y. F. Nicolau, "High-Purity Mercuric Iodide", J. Chem. Technol. Biotechnol., Chem. Technol., 33A(7), 350-60 (1983).
T. Kobagashi et al, "Mass Spectrographic Analysis and SEM Investigation of .alpha.-HgI.sub.2 Crystals Grown by Static Sublimation", Journal of Electrochemical Society, vol. 130, No. 5, (1983) pp. 1183-1191.
Journal of Applied Chemistry of the USSR, vol. 51, No. 3, part 1, Mar. 1976, Plenum Publishing Corporation, New York-G. G. Gospodinov: "Conditions for Production of High-Purity Mercury Diiodide", pp. 520-522.

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