The Mechanism of Ionic Conductivity
in Superionic Conductors AgI, Ag₂S, and Ag₃SI

V. I. Polyakov

Saratov State University, ul. Universitetskaya 42, Saratov, 410601 Russia

Received April 5, 1996

Abstract—Conductivity channels in the superionic conductors AgI, Ag₂S, and Ag₃SI are considered, and a
model of conductivity by silver ions is suggested. Migration of Ag⁺ ions has the character of hindered rotations
along intersecting circular orbits. These orbits form flow channels near crystallographic sites of the tetrahedral,
octahedral, and trigonal types. Allowed orbits are determined by symmetry rules. The most stable Ag⁺ ion posi-
tions are the vertices of the Dirichlet polyhedra of the immobile sublattice.

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