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Effect of hydration on conductivity of Ba4La x Ca2 − x Nb2O11 + 0.5x (x = 0.5, 1, 1.5, 2) phases

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Abstract

Substitution of Ca by La in initial cubic double perovskite Ba4(Ca2Nb2)O11[VO]1 allowed obtaining phases with a similar structure with a lower content of structural oxygen vacancies, Ba4(La x Ca2 − x Nb2)O11 + 0.5x [VO]1 − 0.5x (x = 0.5, 1, 1.5, 2). The impedance technique was used to measure the temperature dependences of conductivity in the atmosphere of dry and humid air. Transport numbers determined using the EMF method in an oxygen-air and water steam concentration cells point to the predominantly hole nature of conductivity in the high-temperature region (T > 600°C) and to predominance of proton conductivity in the low-temperature region. Activation energies of hole and proton conductivity were calculated. Thermogravimetric measurements were carried out under heating from 25 to 1000°C with simultaneous mass-spectrometric determination of evolved H2O and CO2. The properties of the studied Ba4(La x Ca2 − x Nb2)O11 + 0.5x (x = 0.5, 1, 1.5, 2) phases were compared with the earlier studied Ba4 − x La x (Ca2Nb2)O11 + 0.5x phases with similar lanthanum content.

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Authors and Affiliations

  1. Ural Federal University Named after the First President of Russia B.N. Eltsin, Lenina pr. 51, Ekaterinburg, 620083, Russia

    D. V. Korona, I. M. Kutikov & A. Ya. Neiman

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  1. D. V. Korona
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  2. I. M. Kutikov
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  3. A. Ya. Neiman
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Correspondence to D. V. Korona.

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Original Russian Text © D.V. Korona, I.M. Kutikov, A.Ya. Neiman, 2013, published in Rusian in Elektrokhimiya, 2013, Vol. 49, No. 12, pp. 1305–1315.

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Korona, D.V., Kutikov, I.M. & Neiman, A.Y. Effect of hydration on conductivity of Ba4La x Ca2 − x Nb2O11 + 0.5x (x = 0.5, 1, 1.5, 2) phases. Russ J Electrochem 49, 1171–1180 (2013). https://doi.org/10.1134/S1023193512110079

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  • DOI: https://doi.org/10.1134/S1023193512110079

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