Electrical Conductivity of Molten Cobalt Dibromide + Potassium Bromide Mixtures.

Abstract

Electrical Conductivity of Molten Cobalt Dibromide + Potassium Bromide Mixtures. -The electrical conductivity of molten CoBr2 is reported for the first time. It shows a high value of activation energy, decreasing on addition of KBr. In the system CoBr2 + KBr, a significant drop of conductivity occurs at a CoBr2 mole fraction of x = 0.333, indicating the formation of the complex ion in the liquid mixture. -(WOJAKOWSKA*, A.; PLINSKA, S.; JOSIAK, J.; KRZYZAK, E.; J.

Phase Equilibria in Copper(I) Bromide-MBr Systems (M = Li, Na, K)

“…It should be noted that in our previous study of the CuBr-KBr system [14] we observed at a temperature very close to that of the eutectic an additional thermal effect until nearly pure KBr. It was ascribed to a polymorphic transition of K 2 CuBr 3 .…”

Electrical Conductivity of Molten Cobalt Dibromide + Potassium Bromide Mixtures

“…We can expect a similar structure of both CoBr 2 and CoCl 2 in the molten state, if they have the same type of structure in the solid-state just before melting 43 (i.e., if we admit that a high-temperature modification of CoBr 2 has the CdCl 2 -type structure) 3 Comparison of activation energies for conduction of molten mixtures: ○, CoBr 2 (1) + KBr (2), this work; ×, CoCl 2 (1) + KCl (2), Wojakowska et al …”

“…Comparison of conductivity isotherms of molten mixtures at 1100 K: ○, CoBr 2 (1) + KBr (2), this work; ×, CoCl 2 (1) + KCl (2), Wojakowska et al …”

“…As a rule, the chloride system has higher conductivity than the bromide system, mainly due to a smaller size and a higher mobility of the Cl - ion as compared with the Br - ion.

2 Comparison of conductivity isotherms of molten mixtures at 1100 K: ○, CoBr 2 (1) + KBr (2), this work; ×, CoCl 2 (1) + KCl (2), Wojakowska et al

…”

“…Our previous investigations involved the CoCl 2 (1) + KCl (2) system, of a similar type. In this system, we observed on the plot of the activation energy for conduction a distinct local minimum at about x 1 ≈ 0.75 and a clear local maximum at about x 1 ≈ 0.60.…”