Monocrystalline samples of the room-temperature hexagonal phase of Cs5H3(SO4)4•xH2O were studied by using X-ray diffraction techniques. The results showed that a dynamically disordered H-bond network in this phase was responsible for the high protonic conductivity.

B.V.Merinov, A.I.Baranov, L.A.Shuvalov, J.Schneider, H.Schulz: Solid State Ionics, 1994, 74[1-2], 53-9