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Electrotransport properties of a high-temperature phase of CsH2PO4 and composite systems with silicon dioxide at different humidities

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Abstract

Investigations of the electrotransport and thermodynamic properties of CsH2PO4 and composite systems (1 − x)CsH2PO4−xSiO2 (x=0–0.5) synthesized on the basis of silicon dioxide with different magnitude of the specific surface area are conducted while varying the partial pressure of water vapor. It is demonstrated that the superionic phase transition, which is observed in CsH2PO4 at a temperature of 230°C, has nothing to do with the process of dehydration. A strong surface interaction of the salt with the matrix is discovered in composites of different compositions synthesized on the basis of uniformly porous silicon dioxides with specific surface areas of 41–520 m2 g−1 and the value of pH ∼7. The interaction is found to lead to dehydration and to small values of conductivity in the systems heated to temperatures in excess of 230°C. An analysis of the dehydration products is conducted and conditions conducive to the existence of phases with certain compositions are determined.

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Authors and Affiliations

  1. Institute of Solid-State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, ul. Kutateladze 18, Novosibirsk, 630128, Russia

    V. G. Ponomareva & E. S. Shutova

Authors
  1. V. G. Ponomareva
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  2. E. S. Shutova
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Correspondence to V. G. Ponomareva.

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Original Russian Text © V.G. Ponomareva, E.S. Shutova, 2007, published in Elektrokhimiya, 2007, Vol. 43, No. 5, pp. 540–546.

Based on the paper delivered at the 8th Meeting “Fundamental Problems of Solid-State Ionics”, Chernogolovka (Russia), 2006.

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Ponomareva, V.G., Shutova, E.S. Electrotransport properties of a high-temperature phase of CsH2PO4 and composite systems with silicon dioxide at different humidities. Russ J Electrochem 43, 513–520 (2007). https://doi.org/10.1134/S1023193507050035

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  • DOI: https://doi.org/10.1134/S1023193507050035

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