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Sodium self-diffusion coefficient in sodium silicate glass by quasielastic neutron scattering |
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| Authors: | R. Hempelmann C. J. Carlile D. Beyer Ch. Kaps |
| Affiliation: | (1) Physikalische Chemie, Universität des Saarlandes, Im Stadtwald, D-66123 Saarbrücken, Germany;(2) Rutherford Appleton Laboratory, SIS, Chilton, OX11 0QX (Didcot), Oxon, UK;(3) Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität, D-07745 Jena, Germany |
| Abstract: | Using pulsed neutrons of 19.8 Å wavelength a quasielastic line broadening as low as 0.03  eV (FWHM) has been observed due to Na+ diffusion in the glass Na2O·2SiO2. From the linewidths a Na+ self-diffusion coefficient of 3.1·10–8 cm2/s at 420°C was obtained in excellent agreement with the diffusion coefficient determined for the same sample batch using22Na radioactive tracers. The experimental Q dependence of the quasielasic linewidths gives a hint for deviations from a purely random walk in an ionic glass. |
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