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Chemical strain and oxidation-reduction kinetics of epitaxial thin films of mixed ionic-electronic conducting oxides determined by x-ray diffraction
Moreno, Roberto (Institut Català de Nanociència i Nanotecnologia)
Zapata Correa, James Arturo (Institut Català de Nanociència i Nanotecnologia)
Roqueta, Jaume (Institut Català de Nanociència i Nanotecnologia)
Bagués Salgueró, Núria (Institut Català de Nanociència i Nanotecnologia)
Santiso, José (Institut Català de Nanociència i Nanotecnologia)

Date: 2014
Abstract: X-ray diffraction, at high T's and switching between N/air atmospheres, was used to compare the chemical expansion due oxygen non-stoichiometry variations between epitaxial films of different mixed ionic-electronic conductors: LaSrCoO(LSC), BaSrCoFeO(BSCF), LaNiO(LNO), LaNiO(L2NO) and GaBaCoO(GBCO) and LaSrMnO(LSM). LSC and BSCF show the largest relative change in the cell parameter Δc/c = +0. 5%, while L2NO and GBCO show negative Δc/c = -0. 2% and -0. 1%, respectively. LNO and LSM show either reduced or negligible chemical expansions. In all cases the values correspond to their particular defect equilibrium and degree of charge localization. The oxygen surface exchange kinetics was also evaluated from in-situ time-resolved analyses of the cell parameter variations. LSC, LNO and GBCO films show fast oxygen reduction kinetics, k = 5·10, 3·10, and 2·10 cm/s at 700°C, respectively, in relative agreement with reported values, while BSCF films show much slower kinetics than expected, below kchem = 10 cm/s at 650°C, related to the degradation process observed in the films.
Note: Número d'acord de subvenció MINECO/MAT2011-29081-C02-01
Note: Número d'acord de subvenció MINECO/CSD2008-0023
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. Creative Commons
Language: Anglès
Document: article ; recerca ; publishedVersion
Subject: Degradation process ; Epitaxial thin films ; Mixed ionic electronic conductor (MIEC) ; Oxidation reduction ; Oxygen non-stoichiometries ; Oxygen reduction kinetics ; Oxygen surface exchange ; Time-resolved analysis
Published in: Journal of the Electrochemical Society, Vol. 161, Issue 11 (2014) , p. F3046-F3051, ISSN 1945-7111

DOI: 10.1149/2.0091411jes


6 p, 510.6 KB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles

 Record created 2019-06-03, last modified 2020-08-30



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