Hydrogen dynamics in hydro-sodalite Na8 [AlSiO4]6 (OH)2 by inelastic and quasielastic neutron scattering

Abstract
The dynamical properties of hydrogen in the sodalite Na8[AlSiO4]6 (OH)2 were investigated by quasielastic and inelastic neutron scattering techniques. The data were analyzed with a jump model for the hydrogen motion (OH reorientation). The characteristic time of the jump process is 2.1 ps at 295 K, the frequency of the local vibration (jump attempt frequency) is 17.4 THz. The detailed analysis shows that the hydrogen environment in the (Na4OH)3+ complex cation has lower than tetrahedral symmetry.