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Sintering kinetics of nanocrystalline Ce0.9Zr0.1O2 prepared by gel combustion method

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Abstract

The sintering process of nanometric Ce0.9Zr0.1O2 mixed oxides prepared by the amino acid–nitrate gel combustion method was analyzed by dilatometry using the constant heating rate (CHR) and stepwise isothermal dilatometry (SID) methods. The morphology of the mixed oxides was studied by scanning and transmission electron microscopies. The evolution of crystallite size with temperature was analyzed by time-resolved X-ray powder diffraction with synchrotron radiation. The sintering behavior resulted dependent on the morphology of the powders. Samples with nanometric crystallite size start to sinter even 500 K before than micrometric sample. We concluded that sintering process of nanometric Ce0.9Zr0.1O2 is controlled by grain-boundary diffusion for temperatures below 1373–1573 K, depending on the morphology of the sample. At high temperature, the grain-boundary and lattice diffusion become parallel controlling mechanism for sintering.

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Acknowledgements

This work was supported by Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET, PIP 112 2013 0100151 CO) and the Agencia Nacional de Promoción Científica y Técnica (ANPCyT, PICT 2016-1921), Argentina. We also acknowledge the support of the Laboratório Nacional de Luz Síncrotron, LNLS, Brazil (Proposal 20150137).

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Authors and Affiliations

  1. Departamento de Física, Universidad Nacional del Sur, Instituto de Física del Sur, IFISUR, CONICET, Av. L.N. Alem, 1253, B8000CPB, Bahía Blanca, Argentina

    María G. Zimicz & Fernando D. Prado

  2. CONICET, Grupo Caracterización de Materiales, CAB-CNEA, Bustillo, 9500, Bariloche, Argentina

    Analía L. Soldati

  3. UNIDEF, MINDEF, CONICET, Departamento de Investigaciones en Sólidos, CITEDEF, Juan. B. de La Salle N° 4397, (1603) Villa Martelli, Pcia, De Buenos Aires, Argentina

    Susana A. Larrondo

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  1. María G. Zimicz
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  2. Analía L. Soldati
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  3. Susana A. Larrondo
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  4. Fernando D. Prado
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Correspondence to María G. Zimicz.

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Zimicz, M.G., Soldati, A.L., Larrondo, S.A. et al. Sintering kinetics of nanocrystalline Ce0.9Zr0.1O2 prepared by gel combustion method. J Therm Anal Calorim 139, 567–575 (2020). https://doi.org/10.1007/s10973-019-08378-3

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  • DOI: https://doi.org/10.1007/s10973-019-08378-3

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