Nomenclature
CAS number: 1302-09-6
Ag
2Se; mol wt 294.70.
Ag 73.21%, Se 26.79%.
Description and 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.