Abstract
The mechanisms of proton transport in partially deuterated ammonium hydrogen selenate, NH 4 HSeO 4 (AHSe), and partially deuterated mixed crystals of betaine phosphate (DBP) and betaine phosphite (DBPI), DBP 1 m x DBPI x are studied by means of two-dimensional (2D) 2 H NMR and dielectric measurements. In both systems the ionic conductivity is very likely to be realised via jumps of the protons or deuterons between different hydrogen bonds (inter-bond jumps). The importance of certain defects for the conductivity process is revealed. In AHSe jumps occur through non-occupied hydrogen positions. In the mixed crystals DBP 1 m x DBPI x the creation of defects is in fact favoured by the substitution of DBP for DBPI molecules or vice versa.
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