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Impedance and Mott-Schottky Analysis of a Pr0.15Ce0.85O2-x Solid Solution

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Abstract

The semiconductor properties of a praseodymium-cerium oxide solid solution with composition Pr0.15Ce0.85O2-x (PCO) were investigated by d.c. current-voltage and bias-dependent impedance measurements in aqueous solution. The solution data were compared with impedance values of dry cells in air. A Mott-Schottky analysis of the PCO-solution interface capacitance showed p-type semi conductivity, a flat-band potential Efb = (2.0 ± 0.1) V/NHE and an ionized acceptor density NA = 3 10 cm-3. Using these data, an electron hole mobility μh ∼ 10-5 cm2 V-1 s-1 was calculated pointing to a small polaron conduction mechanism with a hopping energy (Eh = 0.4 eV).

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Authors and Affiliations

  1. MADIREL, Université de Provence-CNRS (UMR 6121), Centre Saint-Jérôme 20, F-13397, Marseille Cedex, France

    R. Bouchet & P. Knauth

  2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA

    T. Stefanik & H. L. Tuller

Authors
  1. R. Bouchet
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  2. P. Knauth
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  3. T. Stefanik
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  4. H. L. Tuller
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Bouchet, R., Knauth, P., Stefanik, T. et al. Impedance and Mott-Schottky Analysis of a Pr0.15Ce0.85O2-x Solid Solution. MRS Online Proceedings Library 756, 93 (2002). https://doi.org/10.1557/PROC-756-EE9.3

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  • DOI: https://doi.org/10.1557/PROC-756-EE9.3

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