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Journal of Materials Science

, Volume 49, Issue 18, pp 6353–6362 | Cite as

Phase assembly and electrical conductivity of spark plasma sintered CeO2–ZrO2 ceramics

  • Rosalía Poyato
  • Sylvia A. Cruz
  • Francisco L. Cumbrera
  • Berta Moreno
  • Eva Chinarro
  • José A. Odriozola
Article

Abstract

Ce x Zr1−x O2 (x = 0.10, 0.16 and 0.33) nanocrystalline powders were obtained by a two-step synthesis technique and sintered by spark plasma sintering (SPS). As consequence of the reduction of Ce4+ to Ce3+ species by carbon in the graphite environment in SPS, phase assemblies including tetragonal, monoclinic and pyrochlore phases were generated in the ceramics during the sintering process. The electrical conductivity was highly dependent on phase assembly and atmosphere (N2, H2 and O2). A significant decrease in the activation energy was noticed in the ceramics with high pyrochlore content when measuring the conductivity in H2 atmosphere, consequence of the strong reduction promoted in these ceramics during the measurement. Equal conduction behavior with similar activation energy was observed in all the ceramics when measuring in O2 atmosphere.

Keywords

CeO2–ZrO2 Spark plasma sintering Pyrochlore Electrical conductivity 

Notes

Acknowledgements

Dr. Cruz thanks Junta de Andalucía (TEP-1048) for her fellowship. The financial support for this work has been obtained from the Spanish Ministerio de Ciencia e Innovación (ENE2009-14522-C05-01) and (ENE2009-14522-C05-03). Cofinanced by FEDER funds from the European Union and from Junta de Andalucía (P09-TEP-5454).

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Rosalía Poyato
    • 1
  • Sylvia A. Cruz
    • 1
  • Francisco L. Cumbrera
    • 2
  • Berta Moreno
    • 3
  • Eva Chinarro
    • 3
  • José A. Odriozola
    • 1
  1. 1.Instituto de Ciencia de Materiales de SevillaUniv. de Sevilla-CSICSevilleSpain
  2. 2.Dep. Física de la Materia CondensadaUniv de SevillaSevilleSpain
  3. 3.Instituto de Cerámica y VidrioCSICCantoblanco, MadridSpain

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