Z. Naturforsch. 68a, 59 – 65
Electrical Conductivity of Melts Containing Rare-Earth Halides. II. MCl-PrCl3 (M = Li, Rb, Cs)
1 Institute of High Temperature Electrochemistry, 22, S. Kovalevskaya Str., 620219 Ekaterinburg, Russia
2 Institute of Inorganic Chemistry and Metallurgy of Rare Elements, Wrocław University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wrocław, Poland
3 École Polytechnique, Département Mécanique Energétique, IUSTI-CNRS UMR 7343, Technopôle de Château Gombert, 5 rue Enrico Fermi, F-13453 Marseille Cedex 13, France
Received April 24, 2012 / published online February 15, 2013
The specific conductivity of molten LiCl-PrCl3, RbCl-PrCl3, and CsCl-PrCl3 was measured from the liquidus temperature up to ∼1180 K by a conventional ac technique. The molar conductivity Λ was calculated by using literature data on the densities of the binary systems. In all cases, it was found that the plot ln Λ vs. 1/T is not a straight line. Thereby the activation energy of the conductivity does not remain constant but reduces with increasing temperature. In the specific and molar conductivity isotherms, strong deviations from additivity are observed with maxima in a range 35–45 mol. % PrCl3. The results conform to the idea of dominating octahedral local coordination of Pr3+ ions over the entire concentration range.
Key words: Rare Earth; Electrical Conductivity; Praseodymium; Alkali Chloride.