Title: Silver Selenide
CAS Registry Number: 1302-09-6
Molecular Formula: Ag2Se
Molecular Weight: 294.70
Percent Composition: Ag 73.21%, Se 26.79%
Literature References: Occurs in nature as the mineral naumannite. Prepd by melting silver and selenium together and by passing hydrogen selenide into a soln of silver nitrate: Berzelius, cited by Mellor, A Comprehensive Treatise on Inorganic and Theoretical Chemistry 10, 771 (1930); by combination of ions or elements in solns or melts: Kulifay, US 3026175 (1962 to Monsanto).
Properties: Gray, hexagonal, microscopic needles. mp 880°. d15 8.216. Two forms exist; transition temp at 133°. Forms metallic silver and selenium oxide when heated in oxygen; transformed by chlorine into silver and selenium chlorides; oxidized to silver selenite by fuming nitric acid. Sol in molten silver or bismuth without chemical change. Practically insol in water.
Melting point: mp 880°
Density: d15 8.216 |