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

Abstract : 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.
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https://hal.archives-ouvertes.fr/hal-00920836
Contributor : Monica Ceretti Connect in order to contact the contributor
Submitted on : Wednesday, May 25, 2022 - 6:25:31 PM
Last modification on : Wednesday, May 25, 2022 - 6:45:54 PM

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Jean-Marc. Bassat, Monica Burriel, Olivia Wahyudi, Remy Castaining, Monica Ceretti, et al.. Anisotropic Oxygen Diffusion Properties in Pr2NiO4+δ and Nd2NiO4+δ Single Crystals. Journal of Physical Chemistry C, American Chemical Society, 2013, 117 (50), pp.1932-7447. ⟨10.1021/jp409057k⟩. ⟨hal-00920836⟩

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