ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Binary molten salts with unsymmetrical charges consisting of the chlorides of alkaline earth metals and alkali metals

H.-H. Emons

Sektion Verfahrenschemie, Anorganisch-technische Chemie der Technischen Hochschule für Chemie „Carl Schorlemmer", 42 Leuna — Merseburg, DDR

Abstract:  Based on a classification of binary molten salts the paper deals with some thermodynamic and transport properties of mixtures of unsymmetrical charges М^IIСl₂-М^ICl (M" = Mg, Ca, Sr, Ba; M^I = Li, Na, K, Rb, Cs). Experimental determinations of electrical conductivities, densities, vapour pressures, and e.m.f. of cells with transference were carried out, especially the mixtures СаСl₂—MCI having been extensively investigated. From the values obtained for molar electric conductivities, molar excess conductivities, inner transport numbers, relative cation mobilities, excess volumes, activities, and excess enthalpies, conclusions have been drawn and discussed on the possible structure of these molten mixtures. According to size, charge, and polarizability, different deviations occur from the properties of an ideal mixture that may be qualitatively explained with a "competition" of the cations for the common anions, and with the effect of the structure of the pure salts. The results as a whole may be illustrated with a modified model of vacant cells for ionic liquids.

Full paper in Portable Document Format: 284a447.pdf (in German)

Chemical Papers 28 (4) 447–462 (1974)