Ionic Conductor (LaO)AgS. Electron Microscopic Observation of the Migration of Silver.

Article abstract of DOI:10.1016/0025-5408(81)90059-3

(LaO)AgS is prepared by reaction of Ag//2S on La//2O//2S. It has a compound of tetragonal symmetry; the structure is formed by alternating (LaO)//n and (AgS)//n sheets. It is also a good ionic conductor. In an electron microscope it decomposes, with metallic silver being separated out to form filament whiskers or droplets. La//2O//2S//2, which is also formed, is unstable in the electron beam, and is quickly transformed into the oxysulfate (LaO)//2SO//4.