Abstract
A silver-ion diffusion in \ensuremath{\alpha}-${\mathrm{Ag}}_{2}$Te is investigated by a molecular-dynamics method introducing a polyhedron analysis. The microscopic picture for the diffusion process of silver ions is obtained by studying the ratio of the residence time of silver ions in octahedra, ${\ensuremath{\tau}}_{O}$, to that in tetrahedra, ${\ensuremath{\tau}}_{T}$. The temperature dependence of ${\ensuremath{\tau}}_{O}$/${\ensuremath{\tau}}_{T}$ is expressed as the Arrhenius formula with an activation energy of 0.18 eV.
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