Abstract
NMR studies of Br and Ag nuclei in the superionic conductor Ag 3SBr at pressures up to 7 kbar have been performed. The obtained phase diagram shows a linear increase of the β− γ transition temperature with rising pressure. The temperature dependence of the Ag-spin-lattice relaxation at constant pressure is analyzed in terms of two thermally activated contributions related to the Ag-ion diffusional jumps. The extracted activation energies at 1 bar are in agreement with conductivity measurements. Pressure dependent relaxation yield negative activation volumes amounting to (−7.5 ± 1.2) cm 3/mol at 6 kbar.
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