Abstract
Powders of silver sulfide Ag2S with an average particle size from ~500 to ~20–40 nm have been synthesized by the chemical bath deposition. The powders with a particle size of ~500 nm have a monoclinic (space group P21/c) acanthite structure (α-Ag2S) and the stoichiometric Ag2S composition. It has been revealed for the first time that silver sulfide nanopowders have the same monoclinic acanthite α-Ag2S structure but a nonstoichiometric composition ~Ag1.93S and contain vacant sites in the metal sublattice. The change in the crystal structure upon the transition from cubic argentite β-Ag2S to monoclinic acanthite α-Ag2S is considered.
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