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Applying  63 Cu NMR technique, we observed exchange between the nonequivalent copper sites in crystalline Cu 6 PS 5 Br, known as a member of the mineral "argyrodite". Below 200 K, where the motion of the copper (I) ion is slow, we could distinguish several nonequivalent copper sites. On increasing the temperature, the chemical exchange between the nonequivalent cation sites was seen on the 6 3 Cu NMR spectra. We could determine the activation energy for this motion to be 35 kJ mol -1  , in good agreement with the published ionic conductivity.

Ionic Diffusion in Cu 6 PS 5 Br Studied by 63 Cu NMR