Ionic Diffusion in Cu6PS5Br Studied by Cu NMR
نویسندگان
چکیده
Applying 6 3 Cu N M R technique, we observed exchange between the nonequivalent copper sites in crystalline Cu6PS5Br, 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 " C u N M R spectra. We could determine the activation energy for this motion to be 35 kJ m o l 1 , in good agreement with the published ionic conductivity.
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