Two-dimensional protonic diffusion in a hydrogen-bonded compound CsOH . H2O, studied by solid state NMR

J. Gallier , B. Toudic , M. Stahn , R.E. Lechner , H. Dachs

NMR study of polycrystalline caesium hydroxide monohydrate CsH3O 2 shows a fast protonic diffusion in its high temperature phases. From a direct measurement, the diffusion constant is D = 1.2 x 10-5 exp (-1700/T [K]) cm2 s-1. 1H relaxation data and 2H spectrum indicate a strong 2-d character for this diffusion which is shown to be of Grotthus-type : it takes place through threefold H3O+ rotations combined with H jumps along O-O. Two dimensionality comes from the layered structure and the diffusion mechanism.

Mots clés: caesium compounds; hydrogen bonds; proton magnetic resonance; self diffusion in solids

Domaines: Articles anciens

J. Gallier, B. Toudic, M. Stahn, R.E. Lechner, H. Dachs. Two-dimensional protonic diffusion in a hydrogen-bonded compound CsOH . H2O, studied by solid state NMR. Journal de Physique, 1988, 49 (6), pp.949-957. ⟨10.1051/jphys:01988004906094900⟩. ⟨jpa-00210782⟩