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für Naturforschung in cooperation with the Max Planck Society for the Advancement of Science under a Creative Commons Attribution 4.0 International License. Dieses Werk wurde im Jahr 2013 vom Verlag Zeitschrift für Naturforschung in Zusammenarbeit mit der Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. digitalisiert und unter folgender Lizenz veröffentlicht: Creative Commons Namensnennung 4.0 Lizenz. In the equimolar mixtures, the conductivity mainly depends on the heavier cation. This can be explained by assuming some sort of cooperative motions in the salt5, where a light cation, for instance a lithium ion in thallium sulphate, moves with the same velocity as the thallium ions. A result of this is that the conductivity of TlMeS04 almost is the same for all Me (Fig. 1). For LiMeS04 the situation is reversed (Fig. 2). It can also be observed that in the mixture T12S04 — Rb2S04 and in other mixtures, where the cation radii are narly equal, both A and Q are ideal. This has been observed also for nitrates 17. A comparison between Table 6 and 7 shows that when we mix two salts with very different cation radii, we obtain a very large positive excess activation energy and a negative excess conductivity. This is in agreement with the model mentioned above, since the free volume of a sulphate increases with the radius of the cation 5.

Diffusion in Cubic Sulphates: IV. 22 Na and 24 Na in f.c.c. Li 2 SO 4