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

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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.

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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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Authors and Affiliations

  1. Instituto de Ciencia de Materiales de Sevilla, Univ. de Sevilla-CSIC, Avda. Américo Vespucio, 49, 41092, Seville, Spain

    Rosalía Poyato, Sylvia A. Cruz & José A. Odriozola

  2. Dep. Física de la Materia Condensada, Univ de Sevilla, 41080, Seville, Spain

    Francisco L. Cumbrera

  3. Instituto de Cerámica y Vidrio, CSIC, c/Kelsen 5, 28049, Cantoblanco, Madrid, Spain

    Berta Moreno & Eva Chinarro

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  1. Rosalía Poyato
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  2. Sylvia A. Cruz
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  3. Francisco L. Cumbrera
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  4. Berta Moreno
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  5. Eva Chinarro
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  6. José A. Odriozola
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Correspondence to Rosalía Poyato.

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Poyato, R., Cruz, S.A., Cumbrera, F.L. et al. Phase assembly and electrical conductivity of spark plasma sintered CeO2–ZrO2 ceramics. J Mater Sci 49, 6353–6362 (2014). https://doi.org/10.1007/s10853-014-8361-6

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  • DOI: https://doi.org/10.1007/s10853-014-8361-6

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