Conductivity of highly concentrated aqueous solutions of ammonium and cesium nitrates

The conductivity of the H₂O+NH₃NO₃+CsNO₃ system containing up to 5.80 stoichiometric mol% of CsNO₃ and water/ammonium nitrate mixture with a mol ratio (R_H) varying between 1 and 6 has been measured at temperatures ranging between 275 and 350 K. At a given composition, temperature-dependence of conductivity deviated slightly from Arrhenius behavior. Conductivity composition isotherms have been interpreted in terms of the effect of local liquid microstructure on the ionic conductivity. The occurrence of a maximum at ca. 18 mol% of electrolyte has been discussed on the basis of a free volume model of liquid transport.