Abstract
The appearance of a “liquid-like” proton T 2 and the large value of the proton self-diffusion coefficient D = (2.8-4.4) × 10 −8 cm 2/s above T c = 414 K demonstrate the existence of fast protonic conductivity in Cs 5H 3(SO 4) 4 · H 2O in this phase. Proton NMR linewidth transitions occur around 300 and 240 K demonstrating the slowing down of the motion of acid protons and the freeze-out of crystal water reorientations.
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