The Thermodynamic Characteristics of Vaporization
in the NaIPrI₃ System

V. B. Motalov^a, L. S. Kudin^a, and T. Markus^b

^a Ivanovo State University of Chemical Technology, Ivanovo, Russia

^b Research Center, Juelich, Germany

e-mail: kudin@isuct.ru

Received February 22, 2008

Abstract—The vaporization of the NaIPrI₃ quasi-binary system was studied by high-temperature mass spec-
trometry over the whole concentration range. At 623–994 K, saturated vapor contained not only (NaI)_n and
(PrI₃)_n molecules (n = 1, 2) and Na⁺(NaI)_n (n = 04) and I(PrI₃)_n (n = 12) ions but also mixed molecular and
ionic associates recorded for the first time (NaPrI₄, Na₂PrI₅, , , , , ,
and ). The partial vapor pressures of molecules were calculated, and the equilibrium constants of the
dissociation of neutral and charged associates were measured. The enthalpies of molecular and ion-molecular
reactions were determined, and the enthalpies of formation of gaseous molecules and ions were obtained.

DOI: 10.1134/S0036024409050033

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