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- W2019781639 abstract "The lithium mobility in glasses of composition xLi2S−(1−x)GeS2 has been followed by c.w. (for x = 0.3; 0.4 and 0.5) and pulsed NMR (for x = 0.3 and 0.5) between − 150 and + 280°C. The second moment of the resonance line of 7Li(0.89–1.51 G2) is proportional to the molar fraction of Li2S, which may be correlated to an homogeneous Li nuclei distribution. The resonance line profiles and their thermal evolution seem to show that some Li+ ions do not participate in the conduction. Thermal variation of the spin-lattice relaxation time T1, shows a strongly asymmetrical shape, if one considers In T−11 = ƒ(T−1) on both sides of the observed maxima. This behaviour may be explained by a distribution of the Li correlation times τ corresponding to different jump distances between various possible sites. The Cole-Davidson model allows the best agreement between experimental and theoretical values of the correlation times. The activation energies deduced from this model are close to those obtained from conductivity measurements (0.43 eV by NMR, 0.56 eV by conductivity determinations for x = 0.50), they may be correlated to the longer Li+ jumps in the vitreous matrix." @default.
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- W2019781639 date "1983-01-01" @default.
- W2019781639 modified "2023-09-26" @default.
- W2019781639 title "Ionic lithium conductivity in sulphur base glasses. 7Li NMR study of xLi2S−(1−x)GeS2 system" @default.
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- W2019781639 doi "https://doi.org/10.1016/0022-3697(83)90085-9" @default.
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