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On electrocontact oxidation of iron nanocondensates

  • Nanoscale and Nanostructured Materials and Coatings
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Abstract

The transformation (under the effect of current passed) of a nanostructured metal-oxide coating produced by vacuum deposition of iron in an oxygen atmosphere at a pressure of 10−4 mm Hg on an amorphous glass substrate is studied by measuring voltammetric characteristics. In the freshly deposited film, a linear characteristic is observed that may correspond to direct quantum mechanical tunneling in thin oxide interlayers between metal nanograins. With an increase in the applied current density, when a certain threshold is reached, the conductivity of the conductor rapidly drops because of the thermo- and electrooxidation. In a degraded conductor at a prethreshold current density, a nonlinear voltammetric characteristic is observed, which may be related to the change in the mechanism of current flow restricted by the volume charge, as well as to the negative temperature resistance coefficient typical of fine-crystalline granular nanocomposites.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia

    V. A. Kotenev, V. V. Vysotskii, M. R. Kiselev, V. I. Zolotarevskii & A. Yu. Tsivadze

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  1. V. A. Kotenev
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  2. V. V. Vysotskii
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  3. M. R. Kiselev
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  4. V. I. Zolotarevskii
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  5. A. Yu. Tsivadze
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Correspondence to V. A. Kotenev.

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Original Russian Text © V.A. Kotenev, V.V. Vysotskii, M.R. Kiselev, V.I. Zolotarevskii, A.Yu. Tsivadze, 2010, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2010, Vol. 46, No. 6, pp. 611–615.

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Kotenev, V.A., Vysotskii, V.V., Kiselev, M.R. et al. On electrocontact oxidation of iron nanocondensates. Prot Met Phys Chem Surf 46, 681–685 (2010). https://doi.org/10.1134/S2070205110060092

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  • DOI: https://doi.org/10.1134/S2070205110060092

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