Electrical conductivity and translational diffusion in the 
1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid

Sangoro, J; Iacob, C; Serghei, A; Naumov, S; Galvosas, P; Kaerger, J; Wespe, C; Bordusa, F; Stoppa, A; Hunger, Johannes; Buchner, R; Kremer, F

doi:10.1063/1.2921796

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Electrical conductivity and translational diffusion in the 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid

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Sangoro, J., Iacob, C., Serghei, A., Naumov, S., Galvosas, P., Kaerger, J., et al. (2008). Electrical conductivity and translational diffusion in the 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid. The Journal of Chemical Physics, 128(21): 214509. doi:10.1063/1.2921796.

Cite as: https://hdl.handle.net/21.11116/0000-0004-F884-F

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.