Growth and surface modification of LaFeO₃ thin films induced by reductive annealing Public Deposited

Analytics
http://ir.library.oregonstate.edu/concern/articles/d791sh99p

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Elsevier and can be found at:  http://www.journals.elsevier.com/applied-surface-science.

Descriptions

Attribute NameValues
Alternative Title
  • Growth and surface modification of LaFeO3 thin films induced by reductive annealing
Creator
Abstract or Summary
  • The mixed electronic and ionic conductivity of perovskite oxides has enabled their use in diverse applications such as automotive exhaust catalysts, solid oxide fuel cell cathodes, and visible light photocatalysts. The redox chemistry at the surface of perovskite oxides is largely dependent on the oxidation state of the metal cations as well as the oxide surface stoichiometry. In this study, LaFeO₃ (LFO) thin films grown on yttria-stabilized zirconia (YSZ) was characterized using both bulk and surface sensitive techniques. A combination of in situ reflection high-energy electron diffraction (RHEED), X-ray diffraction (XRD), and Rutherford backscattering spectrometry (RBS) demonstrated that the film is primarily textured in the [1 0 0] direction and is stoichiometric. High-resolution transmission electron microscopy measurements show regions that are dominated by [1 0 0] oriented LFO grains that are oriented with respect to the substrates lattice. However, selected regions of the film show multiple domains of grains that are not [1 0 0] oriented. The film was annealed in an ultra-high vacuum chamber to simulate reducing conditions and studied by angle-resolved X-ray photoelectron spectroscopy (XPS). Iron was found to exist as Fe(0), Fe(II), and Fe(III) depending on the annealing conditions and the depth within the film. A decrease in the concentration of surface oxygen species was correlated with iron reduction. These results should help guide and enhance the design of LFO materials for catalytic applications.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Flynn, B. T., Zhang, K. H. L., Shutthanandan, V., Varga, T., Colby, R. J., Oleksak, R. P., ... Thevuthasan, S. (2015). Growth and surface modification of LaFeO₃ thin films induced by reductive annealing. Applied Surface Science, 330, 309-315. doi:10.1016/j.apsusc.2015.01.028
Series
Keyword
Rights Statement
Funding Statement (additional comments about funding)
Publisher
Peer Reviewed
Language
Replaces
Additional Information
  • description.provenance : Made available in DSpace on 2015-03-23T16:16:31Z (GMT). No. of bitstreams: 1 FlynnBrendanChemBioEnvEngGrowthSurfaceModification.pdf: 2091431 bytes, checksum: fd57ba6eda71a57c323f2b912e731723 (MD5) Previous issue date: 2015-03-01
  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2015-03-23T16:16:31Z (GMT) No. of bitstreams: 1 FlynnBrendanChemBioEnvEngGrowthSurfaceModification.pdf: 2091431 bytes, checksum: fd57ba6eda71a57c323f2b912e731723 (MD5)
  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2015-03-23T16:16:13Z No. of bitstreams: 1 FlynnBrendanChemBioEnvEngGrowthSurfaceModification.pdf: 2091431 bytes, checksum: fd57ba6eda71a57c323f2b912e731723 (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items

Thumbnail Title Date Uploaded Visibility Actions
8p58pf91v?file=thumbnail FlynnBrendanChemBioEnvEngGrowthSurfaceModification.pdf 2017-07-27 Public