1D AND 2D NMR-STUDY OF IONIC-CONDUCTIVITY IN CSDSO4

The Cs-133 and deuteron NMR measurements of the superionic transition in CsDSO4 showed that the mechanism of protonic conductivity involves thermally-activated hopping of deuterons over well-defined lattice sit es. The present 2D NMR study of O-D...O deuteron interbond motion prov ided evidence that slow deuteron exchange between two differently orie nted hydro en bonds in the unit cell of CsDSO4 already takes place at room temperature, thus indicating precursor effects of the superionic transition far below the transition temperature T-0 = 412 K.