Optimisation of growth parameters to obtain epitaxial Y-doped BaZrO3 proton conducting thin films
Magrasó, Anna (Institut Català de Nanociència i Nanotecnologia)
Ballesteros, Belén (Institut Català de Nanociència i Nanotecnologia)
Rodríguez Lamas, Raquel (Institut Català de Nanociència i Nanotecnologia)
Sunding, M. F. (SINTEF Materials & Chemistry)
Santiso, José (Institut Català de Nanociència i Nanotecnologia)

Date:	2018
Abstract:	We hereby report developments on the fabrication and characterization of epitaxial thin films of proton conducting Y-doped BaZrO (BZY) by pulsed laser deposition (PLD) on different single crystal substrates (MgO, GdScO, SrTiO, NdGaO, LaAlO and sapphire) using Ni-free and 1% Ni-containing targets. Pure, high crystal quality epitaxial films of BZY are obtained on MgO and on perovskite-type substrates, despite the large lattice mismatch. The deposition conditions influence the morphology, cell parameters and chemical composition of the film, the oxygen partial pressure during film growth being the most determining. Film characterization was carried out using X-ray diffraction, transmission electron and atomic force microscopies, wavelength dispersive X-ray spectroscopy and angle-resolved X-ray photoelectron spectroscopy. All films show a slight tetragonal distortion that is not directly related to the substrate-induced strain. The proton conductivity of the films depends on deposition conditions and film thickness, and for the optimised conditions its total conductivity is slightly higher than the bulk conductivity of the target material (3 mS/cm at 600 °C, in wet 5% H/Ar). The conductivities are, however, more than one order of magnitude lower than the highest reported in literature and possible reasoning is elucidated in terms of local and extended defects in the films.
Grants:	Ministerio de Economía y Competitividad MAT2011-29081-C02-01 Ministerio de Economía y Competitividad SEV2013-0295
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	BaZrO3 ; Thin film ; Electrolyte ; Proton conductivity ; SOFC ; PC-SOFC
Published in:	Solid state ionics, Vol. 314 (January 2018) , p. 9-16, ISSN 0167-2738

DOI: 10.1016/j.ssi.2017.11.002

Postprint 33 p, 1.0 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles