2017-Sustainable Industrial Processing Summit
SIPS 2017 Volume 3. Gaune-Escard Intl. Symp. / Molten Salt and Ionic Liquid

Editors:Kongoli F, Fehrmann R, Gadzuric S, Gong W, Seddon KR, Malyshev V, Iwata S
Publisher:Flogen Star OUTREACH
Publication Year:2017
Pages:151 pages
ISBN:978-1-987820-65-2
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Electrical Conductivity and Raman Spectra of Molten GaCl3 PCl5 Mixtures

    Alexander Salyulev1; Alexei Potapov1; Emma Vovkotrub1;
    1INSTITUTE OF HIGH TEMPERATURE ELECTROCHEMISTRY, Ekaterinburg, Russian Federation;
    Type of Paper: Regular
    Id Paper: 45
    Topic: 13

    Abstract:

    Molten GaCl3 - PCl5 mixtures are of practical interest, for example in new power sources design.
    In this work we first measured the electrical conductivity of GaCl3 - PCl5 mixtures. The measurements were carried out using quartz capillary cells with Ni- or W-electrodes at the input frequency of 10 kHz. For the first time Raman spectra of the mixtures were obtained by the Renishaw U1000 spectrometer with Ar+ - laser. All measurements were carried out in sealed off cells.
    In spite of the fact that upon melting individual GaCl3 and PCl5 salts form molecular melts with a very low conductivity (k < 110-7 S/cm), we found that the conductivity of GaCl3 - PCl5 mixtures is higher by several orders of magnitude (210-3 - 110-1 S/cm at 20-340 C) than that of individual molten GaCl3 and PCl5. This is caused by the interaction of GaCl3 and PCl5 molecules, which results in their ionization and formation of PCl4+ complex cations and GaCl4-, Ga2Cl7- anions.
    Based on spectroscopic data, we found that in the GaCl3 - PCl5 system as the phosphorus pentachloride concentration gradually increases from 0 to 100% the liquid phase composition changes as follows:
    Molecular Ionic Ionic Molecular
    melt melt melt melt
    Ga2Cl6 = PCl4+ + GaCl4- = PCl4+ + Ga2Cl7- = PCl5 .
    Keywords: GaCl3 - PCl5 melts, electrical conductivity, Raman spectra

    Keywords:

    Chloride; Conductivity; Ion; Mixtures; Moltensalt;

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    Cite this article as:

    Salyulev A, Potapov A, Vovkotrub E. (2017). Electrical Conductivity and Raman Spectra of Molten GaCl3 PCl5 Mixtures. In Kongoli F, Fehrmann R, Gadzuric S, Gong W, Seddon KR, Malyshev V, Iwata S (Eds.), Sustainable Industrial Processing Summit SIPS 2017 Volume 3. Gaune-Escard Intl. Symp. / Molten Salt and Ionic Liquid (pp. 136-137). Montreal, Canada: FLOGEN Star Outreach