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Oxygen interstitial and vacancy conduction in symmetric Ln2 ± x Zr2 ± x O7 ± x/2 (Ln = Nd, Sm) solid solutions

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Abstract

We have compared (Ln2 − x Zr x )Zr2O7 + x/2 (Ln = Nd, Sm) pyrochlore-like solid solutions with interstitial oxide ion conduction and Ln2(Zr2 − x Ln x )O7 − δ (Ln = Nd, Sm) pyrochlore-like solid solutions with vacancy-mediated oxide ion conduction in the symmetric systems Nd2O3-ZrO2 (NdZrO) and Sm2O3-ZrO2 (SmZrO). We have studied their structure, microstructure, and transport properties and determined the excess oxygen content of the (Sm2 − x Zr x )Zr2O7 + x/2 (x = 0.2) material using thermal analysis and mass spectrometry in a reducing atmosphere (H2/Ar-He). The Ln2 ± x Zr2 ± x O7 ± x/2 (Ln = Nd, Sm) solid solutions have almost identical maximum oxygen vacancy and interstitial conductivities: (3–4) × 10−3 S/cm at 750°C. The lower oxygen vacancy conductivity of the Ln2(Zr2 − x Ln x )O7 − δ (Ln = Nd, Sm; 0 < x ≤ 0.3) solid solutions is due to the sharp decrease in it as a result of defect association processes, whereas the interstitial oxide ion conductivity of the (Ln2 − x Zr x )Zr2O7 + x/2 (Ln = Nd, Sm; 0.2 ≤ x < 0.48) pyrochlore-like solid solutions is essentially constant in a broad range of Ln2O3 concentrations.

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Authors and Affiliations

  1. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991, Russia

    A. V. Shlyakhtina, D. A. Belov, I. V. Kolbanev, A. N. Streletskii & L. G. Shcherbakova

  2. Faculty of Chemistry, Moscow State University, Moscow, 119991, Russia

    D. A. Belov & A. V. Knotko

  3. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991, Russia

    O. K. Karyagina

Authors
  1. A. V. Shlyakhtina
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  2. D. A. Belov
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  3. A. V. Knotko
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  4. I. V. Kolbanev
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  5. A. N. Streletskii
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  6. O. K. Karyagina
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  7. L. G. Shcherbakova
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Correspondence to A. V. Shlyakhtina.

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Original Russian Text © A.V. Shlyakhtina, D.A. Belov, A.V. Knotko, I.V. Kolbanev, A.N. Streletskii, O.K. Karyagina, L.G. Shcherbakova, 2014, published in Neorganicheskie Materialy, 2014, Vol. 50, No. 10, pp. 1119–1134.

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Shlyakhtina, A.V., Belov, D.A., Knotko, A.V. et al. Oxygen interstitial and vacancy conduction in symmetric Ln2 ± x Zr2 ± x O7 ± x/2 (Ln = Nd, Sm) solid solutions. Inorg Mater 50, 1035–1049 (2014). https://doi.org/10.1134/S002016851410015X

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  • DOI: https://doi.org/10.1134/S002016851410015X

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