https://doi.org/10.1007/s100530170287
Phase behavior of three-component ionic fluids
Max-Planck-Institut für Kolloid- und Grenzflächenforschung,
14424 Potsdam, Germany
Corresponding author: a amoreira@mpikg-golm.mpg.de
Received:
6
April
2000
Revised:
20
July
2000
Published online: 15 January 2001
We study the phase behavior of solutions
consisting of positive and negative ions of
valence z to which a third ionic species of valence Z> z is added.
Using a discretized Debye-Hückel theory, we
analyze the phase behavior of such systems
for different values of the ratio 
.
We find, for 
, a
three-phase coexistence region and, for 
, a closed
(reentrant) coexistence loop at high temperatures.
We characterize the behavior of these ternary ionic mixtures
as function of charge asymmetry and temperature,
and show the complete phase diagrams for the experimentally relevant
cases of 
and 
, corresponding
to addition of divalent and trivalent ions to monovalent ionic fluids,
respectively.
PACS: 61.20.Qg – Structure of associated liquids: electrolytes, molten salts, etc. / 52.25.Kn – Thermodynamics of plasmas / 05.20.-y – Classical statistical mechanics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
