Pressure coefficients of conductance and of glass transition temperatures in concentrated aqueous LiCl, LiI, and AlCl3 solutions

D. R. MacFarlane, J. Scheirer, S. I. Smedley

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Abstract

We have measured the conductance of LiCl·RH2O, R = 4.5, 7.0, and 8.75, solutions from -70 to 10°C and AlCl3·RH2O, R = 2.4, 3, and 18, solutions from -10 to 10°C from 1 bar to 4 kbar. Glass transition temperatures for LiCl·RH2O where R = 3.0, 4.5, 8.5, and 10.0, LiI·RH2O where R = 6.0, 8.5, and AlCl3·RH2O where R = 18.0, 24.0, and 30.0 to 4 kbar were also measured. The maximum in conductance for LiCl cannot be explained by minimum Tg, since all of these increase linearly with increasing pressure. Therefore, we attribute the conductance maxima in concentrated LiCl solutions to pressure-enhanced proton mobility, where the protons arise from the hydrolysis of the metal cation. Conductance maxima in dilute solutions are ascribed to the pressure-enhanced structure-breaking effects of the ions.

Original languageEnglish
Pages (from-to)2168-2173
Number of pages6
JournalThe Journal of Physical Chemistry
Volume90
Issue number10
Publication statusPublished - 1 Dec 1986

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