Abstract
Na + and Ag + β-alumina for various stoichiometries and for various hydration states have been studied by neutron scattering using incident energy of 0.8 meV with a resolution of 20 μeV in the 200–325° C temperature range. From the weak quasielastic signal (QES) observed for the non- stoichiometric (NS) Ag + β-alumina a translational diffusion constant D t has been estimated at about 10 -5 cm 2 s -1 at 200°C. No such QES has been observed for stoichiometric Ag + and Na + compounds. The dehydration of Na + β-alumina has been evidenced by the disappearance of the broad QES above 300°C; correlatively the low frequency inelastic spectrum of Na + of β-alumina is changed.
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