Internal Cation Mobilities in Ternary (Li, Na, K)<sub>2</sub>CO<sub>3</sub> Eutectic Melt

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  • CHOU Pao-Hwa
    Department of Electronic Chemistry, Tokyo Institute of Technology
  • TAKAGI Ryuzo
    Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
  • OKADA Isao
    Department of Chemistry, Faculty of Science and Engineering, Sophia University

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  • Internal Cation Mobilities in Ternary(Li,Na,K)2CO3 Eutectic Melt

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Abstract

<p>The ε values in the internal cation mobilities of (Li, Na, K)(CO3)0.5 of the eutectic composition (43.5-31.5-25.0 mol %) in the temperature range from 773 K to 1023 K have been measured by a countercurrent electromigration method, that is the Klemm method, where ε is defined as (ui − uj)/ua; ua is the average internal cation mobility and subscripts i and j refer to any two of three cations. From the present data and the densities and electric conductivities, the internal cation mobilities of uLi, uNa and uK have been calculated. The internal mobility of Li+, uLi, was compared to the empirical equation expressed for binary alkali carbonates. The orders of the internal cation mobilities were uK < uLi < uNa at 773-873 K, uLi < uK < uNa at 923 K, and uLi < uNa < uK above 973 K, although these were broadly equal to one another. These orders could be interpreted in terms of the dynamic dissociation model previously presented.</p>

Journal

  • Electrochemistry

    Electrochemistry 67 (6), 587-592, 1999-06-05

    The Electrochemical Society of Japan

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