Preparation of high purity compounds of sulfur, selenium, and te

Details Preparation of high purity compounds of sulfur, selenium, and te Preparation of high purity compounds of sulfur, selenium, and te

1987-08-10

1989-09-26

Straub, Gary P.

Chemistry of inorganic compounds

Selenium or tellurium or compound thereof

Binary compound

423 88, 423133, 4235611, 156DIG72, C01B 1702, C01B 1700, C01G 2800

Patent

active

048698938

ABSTRACT:
A method for preparing compounds of sulfur, selenium, and tellurium includes the formation of the compound from the elements in a closed environment which excludes oxygen, and then the purification of the compound by contacting it with carbon or carbon monoxide. Oxygen, the principal contaminant in conventionally prepared compounds of this group, is excluded from the formation of the compound in the formation step by using a closed reactor, preferably made of vitreous silica. Oxygen in the initial elemental reactants remains in the compound made in this way, and the purification step eliminates the oxygen originally present in the elemental reactants from the compound. Arsenic triselenide made by this approach, glassy and of high purity, is suitable for use in applications requiring infrared transparency.

REFERENCES:
patent: 1917725 (1933-07-01), Lenander
patent: 2019632 (1935-11-01), Ray
patent: 2962343 (1960-11-01), Goedkoop
patent: 4557914 (1985-12-01), Modene
patent: 4564509 (1986-01-01), Shealy et al.
patent: 4579723 (1986-04-01), Weltmer et al.
Kothiyal et al., Preparation of Arsenic Selenide Crystals and Their Electric and Photoconductive Properties, Journal of Crystal Growth, 1981, pp. 519-522.

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