Phase transitions in the H+-conducting perovskite ceramics by the quasi-elastic neutron and high-pressure Raman scattering |
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Authors: | Aneta Slodczyk Philippe Colomban Daniel Lamago Marie-Helene Limage François Romain Stephanie Willemin Beatrice Sala |
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Affiliation: | (1) LADIR UMR 7075, Université Pierre et Marie Curie, CNRS, Paris 6, 2 rue Henry Dunant, Thiais, 94320, France;(2) Laboratoire Leon Brillouin, CEA Saclay, 91191 Gif-sur-Yvette, France;(3) AREVA-NP/IEM, Place Eugène Bataillon, Montpellier, 34095, France |
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Abstract: | H+-containing lanthanide-doped perovskites A(Ba, Sr etc.)B(Zr, Ce, Ti etc.)O3 are potential ceramic membranes for fuel cell and medium temperature water electrolysis (300–800 °C). The comparison studies of the hydrated and non-hydrated Yb-doped BaZrO3 and SrZrO3 were performed by thermal expansion, medium–high temperature neutron and room-temperature high-pressure Raman scattering. Neutron diffraction and elastic/quasi-elastic studies carried out for BaZrO3 ceramic show the presence of the protons, their successive diffusion above ∼600 °C, and then their departure above 750 °C (under vacuum). Phase transitions and their modification by proton insertion are discussed. A high-pressure Raman study of SrZrO3 performed at room temperature in the diamond anvil cell reveals the presence of two pressure-induced phase transitions at about 5 and 22 GPa and confirms that proton insertion modifies the phase transition sequences. Paper presented at the 11th EuroConference on the Science and Technology of Ionics, Batz-sur-Mer, Sept. 9–15, 2007. |
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Keywords: | High-temperature protonic conductors Raman scattering Neutron diffraction Quasi-elastic neutron scattering Phase transitions |
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