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Effects of the counter-cation nature and preparation method on the structure of La2Zr2O7

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Abstract

Lanthanum zirconate with a pyrochlore structure exhibits interesting thermal and structural properties for thermal barrier coating applications operating at high temperature. This study focused on the synthesis of La2Zr2O7 powders by soft chemistry (citrate, coprecipitation, and sol–gel methods), and the effects of the solvent and the nature of the precursors used on the powder properties were investigated. The nature of the counter-cation influenced the structural phase of the compound. A low polarizable counter-cation (chloride) permitted the elaboration of a pyrochlore structure within a larger range of parameters compared with highly polarizable counter-cations (nitrate and acetate). Moreover, the nature of the solvent, and specifically the strength of the interactions within it, had an impact on the particle size. Specifically, the use of water, which is a solvent with strong interactions, led to a smaller particle size than the use of ethanol, which has weaker interactions. Based on these results, the crystalline phase of the powders can be predicted as a function of the precursor and the solvent used for the different synthesis routes, and the particle size can be used to evaluate the reactivity of the powders.

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Acknowledgements

The authors gratefully acknowledge the DGA (French Ministry of Defense) and CNES National R&T program for their financial support.

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Authors and Affiliations

  1. Science des Procédés Céramiques et de Traitements de Surface (SPCTS), 12, rue Atlantis, 87068, Limoges, France

    William Duarte, Ariane Meguekam, Maggy Colas, Michel Vardelle & Sylvie Rossignol

  2. Centre National d’Etudes Spatiales (CNES), Paris, France

    William Duarte

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  1. William Duarte
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  2. Ariane Meguekam
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  3. Maggy Colas
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  4. Michel Vardelle
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  5. Sylvie Rossignol
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Correspondence to Sylvie Rossignol.

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Duarte, W., Meguekam, A., Colas, M. et al. Effects of the counter-cation nature and preparation method on the structure of La2Zr2O7 . J Mater Sci 50, 463–475 (2015). https://doi.org/10.1007/s10853-014-8606-4

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  • DOI: https://doi.org/10.1007/s10853-014-8606-4

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