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Neutron scattering in Ag+ and Na+ β-aluminas |
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| Authors: | J.R. Gavarri G. Lucazeau A.J. Dianoux Ph. Colomban |
| Affiliation: | C.S.P. Université Paris Nord, Villetaneuse, 93430 et E.R.A. au CNRS No. 456, Ecole Centrale, Chatenay Malabry, France;I.L.L. 156X 38042 Grenoble Cedex, France;Labo de chimie appliquée de l''état solide, EMSCP, Paris, France |
| 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 Dt has been estimated at about 10-5 cm2 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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