SODIUM SELF-DIFFUSION COEFFICIENT IN SODIUM-SILICATE GLASS BY QUASI-ELASTIC NEUTRON-SCATTERING

Authors
HEMPELMANN R CARLILE CJ BEYER D KAPS C
Citation
R. Hempelmann et al., SODIUM SELF-DIFFUSION COEFFICIENT IN SODIUM-SILICATE GLASS BY QUASI-ELASTIC NEUTRON-SCATTERING, Zeitschrift fur Physik. B, Condensed matter, 95(1), 1994, pp. 49-53
Citations number
17
Categorie Soggetti
Physics, Condensed Matter
Journal title
Zeitschrift fur Physik. B, Condensed matter → ACNP
ISSN journal
07223277
Volume
95
Issue
1
Year of publication
1994
Pages
49 - 53
Database
ISI
SICI code
0722-3277(1994)95:1<49:SSCISG>2.0.ZU;2-#
Abstract
Using pulsed neutrons of 19.8 angstrom wavelength a quasielastic line broadening as low as 0.03 mueV (FWHM) has been observed due to Na+ dif fusion in the glass Na2O.2SiO2. From the linewidths a Na+ self-diffusi on coefficient of 3.1.10(-8) cm2/s at 420-degrees-C was obtained in ex cellent agreement with the diffusion coefficient determined for the sa me sample batch using Na-22 radioactive tracers. The experimental Q de pendence of the quasielastic linewidths gives a hint for deviations fr om a purely random walk in an ionic glass.