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Conduction and Transport Numbers in Metacomposites MeWO4 ⋅ WO3 (Me = Ca, Sr, Ba)

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Abstract

The conduction and transport numbers of charge carriers for composites in the systems MeWO4-WO3 (Me = Ca, Sr, Ba) are studied as a function of the temperature and the activity of oxygen in a gas phase. The transport numbers are determined by an emf method and are estimated from dependences of conductance on the activity of oxygen in a gas phase. The deficiencies of the given procedure as applied to investigation of properties of composite phases are analyzed. The materials under study are classified with a class of metacomposites. The concentration intervals of the ionic, mixed, and electronic conductions are determined. The conduction of composites of compositions (100 − x)MeWO4 ⋅ xWO3 is predominantly ionic at x ≤ 10 (Me = Ca), x ≤ 60 (Me = Sr), and x ≤ 45 (Me = Ba). The obtained data are explained in the framework of a model that represents a composite as a distributed matrix system where a film of surface phase MeW-s with a high mobility of oxygen ions plays the role of a connected matrix. It is presumed that the surface phase MeW-s possesses double-sided surface activity (α MeW-s ≤ \(\alpha _{WO_3 } ,\;\alpha _{MeWO_4 }\)) and a higher mobility with respect to MeWO4 and WO3. The discovered anomalies of dependences \(\sigma _{O^{2 - } }\)(T) and partial dependences \(\sigma _{O^{2 - } }\), σel(T) are explained by a change in the stoichiometry, morphology, and the degree of connectedness of surface phase MeW-s caused by with a change in the temperature and composition of composites.

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Authors and Affiliations

  1. Ural State University, pr. Lenina 51, Yekaterinburg, 620083, Russia

    A. Ya. Neiman, N. N. Pestereva & A. R. Sharafutdinov

  2. St. Petersburg State University, Universitetskii pr. 26, St. Petergof, 198904, Russia

    Yu. P. Kostikov

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  1. A. Ya. Neiman
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  2. N. N. Pestereva
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  3. A. R. Sharafutdinov
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  4. Yu. P. Kostikov
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Correspondence to A. Ya. Neiman.

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__________

Translated from Elektrokhimiya, Vol. 41, No. 6, 2005, pp. 680–693.

Original Russian Text Copyright © 2005 by Neiman, Pestereva, Sharafutdinov, Kostikov.

Published on the basis of a report delivered at the VII Meeting on Fundamental Problems in Solid-State Ionics (Chernogolovka-2004).

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Neiman, A.Y., Pestereva, N.N., Sharafutdinov, A.R. et al. Conduction and Transport Numbers in Metacomposites MeWO4 ⋅ WO3 (Me = Ca, Sr, Ba). Russ J Electrochem 41, 598–611 (2005). https://doi.org/10.1007/s11175-005-0112-1

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  • DOI: https://doi.org/10.1007/s11175-005-0112-1

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