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Mutual electrosurface transfer and phase formation at the MeWO4|WO3 (Me = Ca, Sr, Ba) interface: Electron microscopy data

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Abstract

Experiments on solid-phase electrosurface migration through formally inert eutectic WO3|MeWO4 interfaces in symmetric electrochemical cells such as Pt|WO3|MeWO4|WO3|Pt are performed. It is shown that the most significant changes occur at the “cathode” interface (−)Pt|WO3|MeWO4|, where counter electrosurface drawing of WO3 to the inner surface of MeWO4 ceramics (with the formation of two-phase distributed composite WO3|MeWO4) and a much smaller flow of Me2+ components to the WO3 ceramics depth are observed. Scanning and transmission electron microscopy showed the formation of nano- and microscale objects of various shape in grain boundaries’ regions, among which well-faceted nanoobjects shaped as ribbons and rods from a few to hundreds of nanometers thick are noticeable. The Ca and Sr contents in WO (−)3 cathode pellets after experiments in cells are determined by X-ray fluorescence analysis, scanning electron microscopy, energy-dispersive analysis, and depth profiling using glow-discharge spectrometry. The data obtained are interpreted based on the concepts of solid-phase electrocapillarity (WO3 migration) and electrochemical intercalation of Me into the WO3 structure.

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Authors and Affiliations

  1. Gorkii Ural State University, ul. Lenina 51, Yekaterinburg, 620083, Russia

    A. Ya. Neiman, V. Yu. Kolosov, N. N. Pestereva & E. A. Elizarova

  2. Chemistry Department, Instituto Tecnológico e Nuclear, Estrada Nacional 10, 2686-953, Sacavém, Portugal

    E. V. Tsipis

  3. Horiba Jobin Yvon, 16/18 rue du Canal, Longjumeau, 91165, Cedex, France

    P. Chapon

  4. Nytek Instruments, ul. Dirizhabel’naya 15A, Dolgoprudny, Moscow oblast, 141700, Russia

    M. Yu. Nekhin

Authors
  1. A. Ya. Neiman
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  2. E. V. Tsipis
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  3. V. Yu. Kolosov
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  4. N. N. Pestereva
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  5. E. A. Elizarova
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  6. P. Chapon
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  7. M. Yu. Nekhin
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Correspondence to A. Ya. Neiman.

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Original Russian Text © A.Ya. Neiman, E.V. Tsipis, V.Yu. Kolosov, N.N. Pestereva, E.A. Elizarova, P. Chapon, M.Yu. Nekhin, 2011, published in Poverkhnost’. Rentgenovskie, Sinkhrotronnye i Neitronnye Issledovaniya, 2011, No. 10, pp. 68–75.

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Neiman, A.Y., Tsipis, E.V., Kolosov, V.Y. et al. Mutual electrosurface transfer and phase formation at the MeWO4|WO3 (Me = Ca, Sr, Ba) interface: Electron microscopy data. J. Surf. Investig. 5, 979–985 (2011). https://doi.org/10.1134/S1027451011100156

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  • DOI: https://doi.org/10.1134/S1027451011100156

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