Sangoro, J. and Iacob, C. and Serghei, A. and Naumov, S. and Galvosas, P. and Kaerger, J. and Wespe, C. and Bordusa, F. and Stoppa, A. and Hunger, J. and Buchner, R. and Kremer, F. (2008) Electrical conductivity and translational diffusion in the 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid. JOURNAL OF CHEMICAL PHYSICS, 128 (21): 214509. ISSN 0021-9606, 1089-7690
Full text not available from this repository. (Request a copy)Abstract
Broadband dielectric and terahertz spectroscopy (10(-2)-10(+12) Hz) are combined with pulsed field gradient nuclear magnetic resonance (PFG-NMR) to explore charge transport and translational diffusion in the 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid. The dielectric spectra are interpreted as superposition of high-frequency relaxation processes associated with dipolar librations and a conductivity contribution. The latter originates from hopping of charge carriers on a random spatially varying potential landscape and quantitatively fits the observed frequency and temperature dependence of the spectra. A further analysis delivers the hopping rate and enables one to deduce-using the Einstein-Smoluchowski equation-the translational diffusion coefficient of the charge carriers in quantitative agreement with PFG-NMR measurements. By that, the mobility is determined and separated from the charge carrier density; for the former, a Vogel-Fulcher-Tammann and for the latter, an Arrhenius temperature dependence is obtained. There is no indication of a mode arising from the reorientation of stable ion pairs. (C) 2008 American Institute of Physics.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | N-ETHYLPYRROLIDINIUM DICYANAMIDE; DOUBLE-LAYER CAPACITOR; ROOM-TEMPERATURE; DIELECTRIC RESPONSE; ELECTROLYTE; RELAXATION; DYNAMICS; SOLVENTS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 29 Oct 2020 10:18 |
| Last Modified: | 29 Oct 2020 10:18 |
| URI: | https://pred.uni-regensburg.de/id/eprint/30744 |
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