1H MAS NMR study of protonic conduction in layered HNbWO 6 · xH 2O ( x = 1.5, 0.5)

Abstract

1H Magic Angle Spinning (MAS) NMR of layered HNbWO 6 · xH 2O ( x = 1.5, 0.5) is carried out at room temperature and at various spinning speeds (1–12 kHz). Results on the fully hydrated sample ( x = 1.5) are consistent with the model of diffusion of H 3O + ions within the layers. In the partially dehydrated sample ( x = 0.5) an exchange between the distinctly present cage protons and H 3O + protons leads to protonic conduction.