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High-temperature mechanical behavior of proton-conducting yttrium-doped barium zirconate perovskite

Abstract : In the attempt to search for an alternative to replace Yttria-Stabilised Zirconia (YSZ) electrolytes in Solid Oxide Fuel Cells (SOFCs), Yttrium-doped Barium Zirconate has emerged as an attractive candidate to be used as electrolyte material for this aim. While numerous studies have been devoted to characterize and optimize the microstructural and electro-chemical properties of Y-doped BaZrO 3 , so far there is little research available on mechanical properties and the influence they have on SOFC lifespan. In this work, an exhaustive mechanical characterization has been carried out with the goal of evaluating by different techniques and comparing the mechanical properties at room temperature of fully dense BaZr 0.85 Y 0.15 O 2.925. The Young´s modulus and nanohardness were first analyzed by nanoindendation and the results were interpreted by the Oliver and Pharr method. The Poisson ratio and Young´s modulus were also determined by mechanical compression tests with optical imaging and resonant ultrasound spectroscopy. These elastic properties obtained experimentally were then compared to density functional calculations. Finally, the fracture toughness and Vickers hardness were evaluated from classical microindentation test. To the best of our knowledge, it is the first time that the elastic properties of fully dense Yttrium-doped Barium Zirconate are reported.
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Submitted on : Wednesday, November 24, 2021 - 9:21:24 AM
Last modification on : Friday, November 26, 2021 - 3:41:03 AM

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D. Ciria, V. Aubin, M. Jimenez-Melendo, G. Dezanneau. High-temperature mechanical behavior of proton-conducting yttrium-doped barium zirconate perovskite. Journal of the European Ceramic Society, Elsevier, 2021, 41 (2), pp.1374-1383. ⟨10.1016/j.jeurceramsoc.2020.09.069⟩. ⟨hal-03434145⟩

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