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Heterogeneously doped nanocrystalline ceria films by grain boundary diffusion: Impact on transport properties

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Abstract

Heterogeneous doping of nanocrystalline ceria films, by controlled in-diffusion along grain boundaries, is explored as a means for modifying the space charge potential and the inhomogeneous distribution of defects in the space charge layer known to control the electrical properties of nanocrystalline electroceramics. Nanocrystalline cerium oxide thin films were grown by pulsed laser deposition and modified by a novel doping technique. Thin diffusion sources were deposited and cations such as Ni2+ and Gd3+ were in-diffused at temperatures of 700–800 °C along columnar grain boundaries normal to the surface; the resulting diffusion profiles were examined by Time-of-Flight SIMS. The properties of these modified films were compared with as-deposited samples, with in-diffusion resulting in decreased electrical conductivity. It is proposed that the variation in conductivity results from a redistribution of charge carriers in the space charge layers due to a change in the space charge potential.

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Acknowledgements

RWTH Aachen University is gratefully acknowledged for providing a Charlemagne scholarship for a student visitation by S.L. This work was supported by the National Science Foundation under award DMR-0243993 and by the Deutsche Forschungsgemeinschaft under project Ge 841/18 within the framework of a joint DFG/NSF program.

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Authors and Affiliations

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

    Scott J. Litzelman & Harry L. Tuller

  2. Institute for Physical Chemistry, RWTH Aachen University, 52056, Aachen, Germany

    Roger A. De Souza & Manfred Martin

  3. Laboratory for Electron Microscopy, Universität Karlsruhe (TH), 76128, Karlsruhe, Germany

    Benjamin Butz & Dagmar Gerthsen

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  1. Scott J. Litzelman
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  2. Roger A. De Souza
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  3. Benjamin Butz
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  4. Harry L. Tuller
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  6. Dagmar Gerthsen
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Correspondence to Scott J. Litzelman.

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Litzelman, S.J., De Souza, R.A., Butz, B. et al. Heterogeneously doped nanocrystalline ceria films by grain boundary diffusion: Impact on transport properties. J Electroceram 22, 405–415 (2009). https://doi.org/10.1007/s10832-008-9445-y

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  • DOI: https://doi.org/10.1007/s10832-008-9445-y

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