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dc.contributor.authorPerry, Nicola
dc.contributor.authorKim, Jae Jin
dc.contributor.authorTuller, Harry L
dc.date.accessioned2018-10-16T18:09:08Z
dc.date.available2018-10-16T18:09:08Z
dc.date.issued2018-02
dc.date.submitted2017-04
dc.identifier.issn1468-6996
dc.identifier.issn1878-5514
dc.identifier.urihttp://hdl.handle.net/1721.1/118587
dc.description.abstractWe compare approaches to measure oxygen surface exchange kinetics, by simultaneous optical transmission relaxation (OTR) and AC-impedance spectroscopy (AC-IS), on the same mixed conducting SrTi[subscript 0.65]Fe[subscript 0.35]O[subscript 3-x] film. Surface exchange coefficients were evaluated as a function of oxygen activity in the film, controlled by gas partial pressure and/or DC bias applied across the ionically conducting yttria-stabilized zirconia substrate. Changes in measured light transmission through the film over time (relaxations) resulted from optical absorption changes in the film corresponding to changes in its oxygen and oxidized Fe (~Fe[superscript 4+]) concentrations; such relaxation profiles were successfully described by the equation for surface exchange-limited kinetics appropriate for the film geometry. The k[subscript chem] values obtained by OTR were significantly lower than the AC-IS derived k[subscript chem] values and k[subscript q] values multiplied by the thermodynamic factor (bulk or thin film), suggesting a possible enhancement in k by the metal current collectors (Pt, Au). Long-term degradation in kchemand kqvalues obtained by AC-IS was also attributed to deterioration of the porous Pt current collector, while no significant degradation was observed in the optically derived kchemvalues. The results suggest that, while the current collector might influence measurements by AC-IS, the OTR method offers a continuous, in situ, and contact-free method to measure oxygen exchange kinetics at the native surfaces of thin films. Keywords: Thin films; perovskite; mixed ionic and electronic conductor; oxygen surface exchange; optical absorption; impedance spectroscopyen_US
dc.description.sponsorshipUnited States. Department of Energy. Office of Basic Energy Sciences (Grant DE-SC0002633)en_US
dc.publisherIOP Publishingen_US
dc.relation.isversionofhttp://dx.doi.org/10.1080/14686996.2018.1430448en_US
dc.rightsCreative Commons Attribution 4.0 International Licenseen_US
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_US
dc.sourceTaylor & Francisen_US
dc.titleOxygen Surface Exchange Kinetics Measurement by Simultaneous Optical Transmission Relaxation and Impedance Spectroscopy: Sr(Ti,Fe)O[subscript 3-x] Thin Film Case Studyen_US
dc.typeArticleen_US
dc.identifier.citationPerry, Nicola H. et al “Oxygen Surface Exchange Kinetics Measurement by Simultaneous Optical Transmission Relaxation and Impedance Spectroscopy: Sr(Ti,Fe)O[subscript 3-x] Thin Film Case Study.” Science and Technology of Advanced Materials 19, 1 (February 2018): 130–141 © 2018 The Author(s)en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Materials Science and Engineeringen_US
dc.contributor.mitauthorPerry, Nicola
dc.contributor.mitauthorKim, Jae Jin
dc.contributor.mitauthorTuller, Harry L
dc.relation.journalScience and Technology of Advanced Materialsen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dc.date.updated2018-09-28T11:57:16Z
dspace.orderedauthorsPerry, Nicola H.; Kim, Jae Jin; Tuller, Harry L.en_US
dspace.embargo.termsNen_US
dc.identifier.orcidhttps://orcid.org/0000-0002-9811-0077
dc.identifier.orcidhttps://orcid.org/0000-0001-8339-3222
mit.licensePUBLISHER_CCen_US


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