Selenium is a chemical element with the atomic number 34, delineate away the chemical symbolisation sou'-east, an atomic mass of seventy-eight.96. It comprises a nonmetal, chemically related to sulfur and tellurium, and rarely falls out in thems natural Department of State in nature. It is mainly used for preparation of toner materials, photoelectric materials, electrostatic materials, photography, and other optical instruments.
Black solid or reddish powder. Also stylish form of red or gray crystalline. Crystalline selenium is a p-type semiconductor. Electrically, it acts as a rectifier, and has marked photoconductive and photovoltaic action (converts radiant to electrical energy). The electrical conductivity increases with increasing light irradiation. Soluble in concentrated nitric acid and in (liquid form) common alkalies. Forms binary alloys with silver, copper, zinc, lead, etc. Low toxicity. A necessary nutritional factor for animals.
High Purity Selenium:
Se-05 Grade 99.999. The content of Selenium is above 99.999%. The total content of Ag, Al, Bi, Cd, Cu, Fe, Ga, In, Mg, Ni, Pb, Sb, Te & Tl is bellow 10 ppm. Amorphous red powder, becoming black on standing and crystalline on heating; vitreous and colloidal forms may be prepared. Amorphous form softens at 40 °C and melts at 217 °C .
High purity selenium is mainly used in the preparation of the material of the selenium drum, photoelectric material, electrostatic photogragh and other materials of optical instrument.
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