Tensile Lattice Distortion Does Not Affect Oxygen Transport in Yttria-Stabilized Zirconia–CeO₂ Heterointerfaces

Abstract

Biaxially-textured epitaxial thin-film hetero-structures of ceria and 8 mol% yttria-stabilized zirconia (8YSZ) were grown using Pulsed Laser Deposition (PLD) with the aim to unravel the effect of the interfacial conductivity on the charge transport properties. Five different samples were fabricated keeping the total thickness constant (300 nm) but with a different number of hetero-interfaces (between

Porous La0.6Sr0.4CoO3−δ thin film cathodes for large area micro solid oxide fuel cell power generators

“…Thus, fabrication of large-area YSZ membranes with similar performances than those already reported was satisfactorily proven. Although film stress has a marked influence on ionic-conduction properties by affecting the charge carrier mobility [59][60][61][62][63][64], any relevant contribution of the strain on the cross-plane conductivity was observed neither in this work nor in M A N U S C R I P T…”

Edge dislocation slows down oxide ion diffusion in doped CeO2 by segregation of charged defects

“…This phenomenon has been called fast pipe diffusion (orders of magnitude faster than that in bulk). Because of what is known in metals, dislocations have been therefore suggested to enhance ionic conductivity in oxides as well [28][29][30] . For example, Sillassen et al 28 have observed 3.5 orders of magnitude acceleration in the ionic conductivity for a 8.7 mol.% yttria-stabilized zirconia (YSZ) epitaxial film on MgO substrate.…”

Cerium reduction at the interface between ceria and yttria-stabilised zirconia and implications for interfacial oxygen non-stoichiometry

“…[4][5][6] In recent years, a number of studies have addressed the possibility of enhancing oxygen vacancy conduction through the fabrication of multilayers containing YSZ and/or acceptor doped CeO 2 . [7][8][9][10][11] Previous investigations suggested different possible explanations of the interfacial effects such as misfit dislocations, segregations of dopants, strain, and space charge regions. 12,13 However, possible mechanisms for the enhanced ionic conductivity in CeO 2 /YSZ hetero-structures are still under discussion.…”

“…11,21 Spectra acquired from CeO 2 and CePO 4 powders were used as reference spectra for Ce 4+ and Ce 3+ , respectively. All the spectra were normalized based on the integrated intensity of continuum background in the range between 915 eV and 925 eV (after background subtraction and removal of plural scattering).…”