Electric Conduction in Molten Salts

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  • OKADA Isao
    Department of Chemistry, Faculty of Science and Engineering, Sophia University

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Abstract

<p>Molten additive binary systems having a common anion yield much more heuristic information for a better understanding of the mechanism of ionic conduction than pure melts do. In most of such systems the Chemla effect occurs; the mobility isotherms of two cations have a crossing point called the Chemla crossing point. In binary multivalent cation systems, the larger cation is more mobile than the smaller one. An internal mobility u of a monovalent cation is generally expressed by an empirical equation: u = [A/(Vm − V0)]exp(−E/RT), where Vm is the molar volume; A, V0 and E are constants nearly independent of the kind of the second cation. Deviation from this equation could be interpreted in terms of the agitation effect (positive deviation), and the tranquilization effect or the free space effect (negative deviation). The dynamic dissociation model well accounts for the above-mentioned findings; in other words, the internal mobility is strongly related to the dissociative motion of neighboring cation and anion. The effect of highly polarizable cations on internal mobilities is also discussed.</p>

Journal

  • Electrochemistry

    Electrochemistry 67 (6), 529-540, 1999-06-05

    The Electrochemical Society of Japan

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