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Oxygen ion conductivity of (Yb0.9 − x Tb x Ca0.1)2Ti2O7 − δ solid solutions

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Abstract

We have studied terbium substitution for ytterbium in (Yb0.9 − x Tb x Ca0.1)2Ti2O7 − δ (x = 0.1, 0.2, 0.3, 0.4) pyrochlore solid solutions synthesized through coprecipitation followed by firing at 1550°C. The results indicate that only a small amount of terbium (less than 10%) can be incorporated into the pyrochlore structure of (Yb0.9Ca0.1)2Ti2O6.9 because of the large difference in ionic radius between the terbium and ytterbium cations: Δr = r(Tb 3+CN 8 ) − r(Yb 3+CN 8 ) = 0.055 Å. The oxygen ion conductivity of the (Yb0.9 − x Tb x Ca0.1)2Ti2O7 − δ solid solutions has been determined by impedance spectroscopy in air in the temperature range 300 to 900°C. At high temperatures (t > 640°C), their bulk conductivity was essentially independent of the Yb/Tb ratio. The observed decrease in density and microstructural changes were insignificant. At relatively low temperatures (t < 640°C), the bulk conductivity decreased slightly, and the decrease depended little on terbium concentration.

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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 & L. G. Shcherbakova

  2. Moscow State University, Moscow, 119899, Russia

    D. A. Belov & S. Yu. Stefanovich

  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. S. Yu. Stefanovich
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  4. O. K. Karyagina
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  5. 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, S.Yu. Stefanovich, O.K. Karyagina, L.G. Shcherbakova, 2012, published in Neorganicheskie Materialy, 2012, Vol. 48, No. 11, pp. 1259–1263.

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Shlyakhtina, A.V., Belov, D.A., Stefanovich, S.Y. et al. Oxygen ion conductivity of (Yb0.9 − x Tb x Ca0.1)2Ti2O7 − δ solid solutions. Inorg Mater 48, 1126–1130 (2012). https://doi.org/10.1134/S0020168512100111

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  • DOI: https://doi.org/10.1134/S0020168512100111

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