Frequency-dependent spin-lattice relaxation study of transport processes in superionic conductors
- 48 Downloads
The sensitivity of the19F spin-lattice relaxation dispersion, T1,(ω), to motional disorder in crystalline superionic conductors of the type La1−xSrxF3−x (x = 0; 0.03) is shown. T1 times are measured in the frequency range from 90 kHz to 370 MHz using standard techniques in combination with field-cycling. The relaxation dispersion shows qualitative differences from the standard Bloembergen-Purcell-Pound behavior. At low frequencies a relaxation model using a distribution of correlation times for diffusing ions is found to be consistent with the experimental results. At frequencies higher than 50 MHz another process of the Debye type which is not induced by ionic hopping dominates the relaxation.
KeywordsCorrelation Time LaF3 Superionic Conductor Relaxation Dispersion Heterovalent Substitution
Unable to display preview. Download preview PDF.
- Noack F.: NMR Basic Princ. Prog.3, 83–144 (1971)Google Scholar
- Kimmich R.: NMR Tomography, Diffusometry, Relaxometry. Berlin: Springer 1997.Google Scholar
- Terekov M.V., Dvinskikh S.V.: Instrum. Exp. Tech.39, 452–457 (1996)Google Scholar
- Maximov B., Schulz H.: Acta Crystallogr.B41, 88–91 (1985)Google Scholar
- Zalkin A., Templeton D.H.: Acta Crystallogr.B41, 91–93 (1985)Google Scholar
- Privalov A.F., Murin I.V., Vieth H.-M.: Solid State Ionics101-103, 393–396 (1997)Google Scholar
- Dvinskikh S.V.: Instrum. Exp. Tech.39, 709–711 (1996)Google Scholar