Anisotropic oxygen diffusion properties in Pr2NiO 4+δ and Nd2NiO4+δ single crystals

Jean Marc Bassat, Mónica Burriel, Olivia Wahyudi, Rémi Castaing, Monica Ceretti, Philippe Veber, Isabelle Weill, Antoine Villesuzanne, Jean Claude Grenier, Werner Paulus, John A. Kilner

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81 Citations (SciVal)


The anisotropy of the oxygen anionic conductivity was measured for two mixed ionic electronic conducting (MIEC) oxides with the 2D K 2NiF4-type structure, i.e., Nd2NiO 4+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 Pr 2NiO4+δ is higher than that of Nd 2NiO4+δ due to a much lower diffusion activation energy (0.5 and 1.4 eV for Pr2NiO4+δ and Nd 2NiO4+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.

Original languageEnglish
Pages (from-to)26466-26472
Number of pages7
JournalJournal of Physical Chemistry C
Issue number50
Early online date27 Nov 2013
Publication statusPublished - 19 Dec 2013

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry


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