title: High pressure as a key factor to identify the conductivity mechanism in protic ionic liquids.
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.
authors: Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland.
authors: Z
authors: Z
authors: Wojnarowska
authors: Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors: Y
authors: Y
authors: Wang
authors: Leibniz Institute of Polymer Research Dresden, Hohe Straße 6, D-01069 Dresden, Germany.
authors: J
authors: J
authors: Pionteck
authors: Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland.
authors: K
authors: K
authors: Grzybowska
authors: Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Chemistry, University of Tennessee Knoxville, Knoxville, Tennessee 37996, USA.
authors: A P
authors: AP
authors: Sokolov
authors: Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland.
authors: M
authors: M
authors: Paluch