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Article Dans Une Revue Ceramics International Année : 2021

Continuous hydrothermal synthesis in supercritical conditions as a novel process for the elaboration of Y-doped BaZrO3

Résumé

The present work describes a novel process for the elaboration of a ceramic material. Y-doped barium zirconate, an electrolyte material for Protonic Ceramic Fuel cell, was synthesized by a continuous hydrothermal process in supercritical conditions (410 • C/30.0 MPa) using nitrate precursors and NaOH reactants. The use of supercritical water allowed the formation of particles of about 50 nm in diameter with a narrow size distribution. X-Ray Diffraction examination revealed that a major perovskite phase with few BaCO 3 and YO(OH) impurities was obtained. BaCO 3 is assumed to form due to faster kinetics than Y-doped BaZrO 3 resulting in a Ba-deficient perovskite phase. The Ba-deficiency limits the incorporation of yttrium into the perovskite structure. However, a thermal treatment at 1000 • C for 1 h allows to homogenize the composition and thus to obtain the compound Ba 1.01 Zr 0.85 Y 0.15 O 3-δ .
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hal-04027055 , version 1 (09-05-2023)

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Paternité - Pas d'utilisation commerciale

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Mélanie François, Frédéric Demoisson, Mohamed Sennour, Gilles Caboche. Continuous hydrothermal synthesis in supercritical conditions as a novel process for the elaboration of Y-doped BaZrO3. Ceramics International, 2021, 47 (12), pp.17799-17803. ⟨10.1016/j.ceramint.2021.03.044⟩. ⟨hal-04027055⟩
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