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Authors Wojnarowska, Z. ; Wang, Y. ; Pionteck, J. ; Grzybowska, K. ; Sokolov, J. ; Paluch, M.
Title High pressure as a key factor to identify the conductivity mechanism in protic ionic liquids
Date 31.12.2013
Number 39945
Abstract In this Letter we report the relation between ionic conductivity and structural relaxation in supercooled protic ionic liquids (PILs) under high pressure. The results of high-pressure dielectric and volumetric measurements, combined with rheological and temperature-modulated differential scanning calorimetry experiments, have revealed a fundamental difference between the conducting properties under isothermal and isobaric conditions for three PILs with different charge transport mechanisms (Grotthuss vs vehicle). Our findings indicate a breakdown of the fractional Stokes-Einstein relation and Walden rule when the ionic transport is controlled by fast proton hopping. Consequently, we demonstrate that the studied PILs exhibit significantly higher conductivity than one would expect taking into account that they are in fact a mixture of ionic and neutral species. Thus, the examined herein samples represent a new class of “superionic” materials desired for many advanced applications. © 2013 American Physical Society
Publisher Physical Review Letters
Wikidata
Citation Physical Review Letters 111 (2013) 225703, 5 pages
DOI https://doi.org/10.1103/PhysRevLett.111.225703
Tags pacs: 64.70.pm 62.50.-p 66.10.ed 77.22.-d

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