Title: Cadmium Selenide
CAS Registry Number: 1306-24-7
Molecular Formula: CdSe
Molecular Weight: 191.37
Percent Composition: Cd 58.74%, Se 41.26%
Literature References: Prepd by heating cadmium in a current of hydrogen selenide and subliming the product in hydrogen at a dull red heat: Margottet, Recherches sur les Sulfures, les Séléniures, et les Tellures Métalliques, Paris (1879); by passing hydrogen selenide over heated cadmium chloride and washing with warm water: Grzenkowsky, Ueber Selenide und Erdalkaliferrocyanide (Danzig, 1925); from cadmium sulfate and hydrogen selenide: Wagenknecht, Juza in Handbook of Preparative Inorganic Chemistry vol. 2, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1965) p 1099. Prepn of high purity CdSe: Taylor, Conn, US 3540859 (1970 to Merck & Co.).
Properties: White to brown cubic or hexagonal crystals; turns red in sunlight. d 5.8; mp 1350°. Dec in air or acids. Practically insol in water.
Melting point: mp 1350°
Density: d 5.8
Use: In photoconductors, semiconductors, photoelectric cells, and rectifiers; in phosphors. |