BASSAT, Jean-Marc.; BURRIEL, Monica; WAHYUDI, Olivia; CASTAINING, Remy; CERETTI, Monica; VEBER, Philippe; WEILL, Isabelle; VILLESUZANNE, Antoine; GRENIER, Jean-Claude; PAULUS, Werner; A. KILNER, John

doi:10.1021/jp409057k

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BASSAT, Jean-Marc.
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

BURRIEL, Monica
Department of Materials

WAHYUDI, Olivia
Institut des Sciences Chimiques de Rennes [ISCR]

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Journal of Physical Chemistry C. 2013, vol. 117, n° 50, p. 1932-7447

American Chemical Society

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The anisotropy of the oxygen anionic conductivity was measured for two mixed ionic electronic conducting (MIEC) oxides with the 2D K2NiF4-type structure, i.e., Nd2NiO4+δ and Pr2NiO4+δ, using high quality single crystals. Measurements of the oxygen diffusivity and surface exchange performed parallel and perpendicularly to the [001] direction, from 450 to 700 °C, using the isotope exchange depth profile (IEDP) technique, combining 16O/18O exchange and secondary ion mass spectroscopy (SIMS) are reported. For both materials the diffusion is about 3 orders of magnitude higher along the (a,b)-plane compared to the perpendicular (c-axis) direction. These values are among the highest when compared to several state-of-the-art MIEC materials. The diffusion along the (a,b)-plane for Pr2NiO4+δ is higher than that of Nd2NiO4+δ due to a much lower diffusion activation energy (0.5 and 1.4 eV for Pr2NiO4+δ and Nd2NiO4+δ, respectively). A large anisotropy is also observed in the surface exchange coefficient (k*) values for both materials, with (a,b)-plane coefficients being 1 to 1.5 orders of magnitude larger than those for the c-axis.< Réduire

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Anisotropic Oxygen Diffusion Properties in Pr2NiO4+δ and Nd2NiO4+δ Single Crystals

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