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Conductivity of fluorite–type Pr6–x WO12–1.5x tungstates (x = 0.5; 0.75; 1; 1.25)

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Abstract

Ceramic (polycrystalline) samples with the nominal composition of Pr6–x WO12–1.5x (x = 0.5; 0.75; 1; 1.25) are obtained using solid–phase synthesis. Samples with x = 0.5 and 0.75 are single–phase. The temperature dependences of conductivity (900…200°C) are measured in the atmospheres of dry (\({P_{{H_2}O}}\) = 10–4 atm) and humid (\({P_{{H_2}O}}\) = 3 × 10–2 atm) air and also when \({P_{{O_2}}}\) was varied from 0.21 to 10–5 atm. The dependence of conductivity on \({P_{{O_2}}}\) is close to linear and is determined by the equation of logσ ≈ const + n · log\({P_{{O_2}}}\) (where n ≈ 1/10 at 900°C) with a positive slope characteristic for hole conductivity. The EMF technique is used to determine the temperature dependence (900…200°C) of ion transport numbers t(ion) (0…0.02). Hole conductivity prevails. Activation energies of hole conductivity are calculated: (0.39…0.43 eV).

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Authors and Affiliations

  1. Ural Federal University Named after the First President of Russia B.N. Eltsin, ul. Mira 19, Ekaterinburg, 620002, Russia

    D. V. Korona, G. S. Partin & A. Ya. Neiman

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  1. D. V. Korona
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  2. G. S. Partin
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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, G.S. Partin, A.Ya. Neiman, 2015, published in Elektrokhimiya, 2015, Vol. 51, No. 10, pp. 1049–1059.

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Korona, D.V., Partin, G.S. & Neiman, A.Y. Conductivity of fluorite–type Pr6–x WO12–1.5x tungstates (x = 0.5; 0.75; 1; 1.25). Russ J Electrochem 51, 925–934 (2015). https://doi.org/10.1134/S1023193515100067

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  • DOI: https://doi.org/10.1134/S1023193515100067

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