Document Type
Article
Publication Date
7-1-1992
Journal or Book Title
Physical Review B
Volume
46
Issue
25
First Page
795
Last Page
800
DOI
10.1103/PhysRevB.46.795
Abstract
Li7 nuclear spin-lattice relaxation rates (R1) versus the temperature at several resonance frequencies (4 to 40 MHz) are reported together with the conductivity measurements, σ(ω), in the range 1 Hz to 3.76 MHz on 0.56Li2S+0.44Si2S, a glassy fast-ionic conductor. Both R1 and σ(ω) are fitted consistently over the whole temperature and frequency range by using a stretched-exponential, i.e., exp(-t/τ*c)β for the corresponding correlation functions (CF). Formulas that relate R1(ω) and σ(ω) and that give the asymptotic behavior as functions of T and ω of both quantities are tested experimentally. We find significant differences between βσrelated to σ(ω) and βR related to R1, which implies a difference in the corresponding correlation functions of the ionic diffusional motion. An apparent order-of-magnitude difference in τ*0 attempt times was derived from these conductivity and NMR measurements. The implications of these findings are discussed in terms of the microscopic mechanisms which lead to fluctuations and relaxation in fast-ionic conductors.
Copyright Owner
American Physical Society
Copyright Date
1992
Language
en
File Format
application/pdf
Recommended Citation
Borsa, Ferdinando; Torgeson, D. R.; Martin, Steve W.; and Patel, Hitendra K., "Relaxation and fluctuations in glassy fast-ion conductors: Wide-frequency-range NMR and conductivity measurements" (1992). Materials Science and Engineering Publications. 75.
https://lib.dr.iastate.edu/mse_pubs/75
Comments
This article is from Physical Review B 46 (1992): 795–800, doi:10.1103/PhysRevB.46.795. Posted with permission.