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Electric field-assisted pressureless sintering of zirconia–scandia–ceria solid electrolytes

  • Ceramics
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Abstract

Electric field-assisted (flash) pressureless sintering experiments were carried out in ZrO2 ceramics doped with 10 mol% Sc2O3 and 1 mol% CeO2 (10Sc1CeSZ). All experiments were conducted isothermally at 1050 °C for 2–5 min with the application of a 100–150 V cm−1 AC electric field at 1 kHz with 1–4 A limiting current in green compacts and in samples pre-sintered at different temperatures. Shrinkage level, structural phases and grain morphology data were collected by dilatometry, X-ray diffraction and scanning electron microscopy analyses, respectively. The results showed that for the same delivered electric power, the final shrinkage was higher for higher temperature applications of the electric field and for higher electric current pulses. Moreover, the higher the porosity, the higher the final densification of the flash-sintered 10Sc1CeSZ samples, showing that pores play a role as a preferential path in the flash sintering mechanism.

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Acknowledgements

To Comissão Nacional de Energia Nuclear—CNEN, Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq (Procs. 470952/2013-0, 303483/2013-0) and Fundação de Amparo à Pesquisa do Estado de São Paulo—FAPESP (Proc. 2013/07296-2) for financial support. One of the authors (SGMC) acknowledges Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the doctorate scholarship.

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Authors and Affiliations

  1. Center of Science and Technology of Materials, Energy and Nuclear Research Institute, Travessa R 400, Cidade Universitária, S. Paulo, SP, 05508-170, Brazil

    Eliana N. S. Muccillo, Sabrina G. M. Carvalho & Reginaldo Muccillo

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  1. Eliana N. S. Muccillo
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  2. Sabrina G. M. Carvalho
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  3. Reginaldo Muccillo
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Correspondence to Reginaldo Muccillo.

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Muccillo, E.N.S., Carvalho, S.G.M. & Muccillo, R. Electric field-assisted pressureless sintering of zirconia–scandia–ceria solid electrolytes. J Mater Sci 53, 1658–1671 (2018). https://doi.org/10.1007/s10853-017-1615-3

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