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Title: Structural perturbations of epitaxial α-(Fe1-xVx)2O3 thin films driven by excess oxygen near the surface

Abstract

We examine the structure and composition of phase-pure epitaxial α-(Fe1-xVx)2O3 thin films deposited on α-Al2O3(0001) substrates by oxygen-plasma-assisted molecular beam epitaxy for 0 ≤ x ≤ ~0.5. The films crystallize in the corundum lattice, with vanadium substituting for iron throughout. Vanadium cations exhibit the expected 3+ charge state in the bulk, but exhibit higher valences nearer to the surface, most likely because of excess oxygen in interstitial sites near the surface. The extent of vanadium oxidation beyond the 3+ state is inversely proportional to x. The gradation of vanadium valence with depth may have an impact on local bonding geometries, and could be highly significant in this material’s efficiency as a photocatalyst.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1188913
Report Number(s):
PNNL-SA-105900
48144; KC0304030
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Applied Physics, 116(23):Article No. 233702
Additional Journal Information:
Journal Name: Journal of Applied Physics, 116(23):Article No. 233702
Country of Publication:
United States
Language:
English
Subject:
N06266; N00784; Environmental Molecular Sciences Laboratory

Citation Formats

Chamberlin, Sara E., Kaspar, Tiffany C., Bowden, Mark E., Shutthanandan, V., Kabius, Bernd C., Heald, Steve M., Keavney, David, and Chambers, Scott A. Structural perturbations of epitaxial α-(Fe1-xVx)2O3 thin films driven by excess oxygen near the surface. United States: N. p., 2014. Web. doi:10.1063/1.4903839.
Chamberlin, Sara E., Kaspar, Tiffany C., Bowden, Mark E., Shutthanandan, V., Kabius, Bernd C., Heald, Steve M., Keavney, David, & Chambers, Scott A. Structural perturbations of epitaxial α-(Fe1-xVx)2O3 thin films driven by excess oxygen near the surface. United States. https://doi.org/10.1063/1.4903839
Chamberlin, Sara E., Kaspar, Tiffany C., Bowden, Mark E., Shutthanandan, V., Kabius, Bernd C., Heald, Steve M., Keavney, David, and Chambers, Scott A. 2014. "Structural perturbations of epitaxial α-(Fe1-xVx)2O3 thin films driven by excess oxygen near the surface". United States. https://doi.org/10.1063/1.4903839. https://www.osti.gov/servlets/purl/1188913.
@article{osti_1188913,
title = {Structural perturbations of epitaxial α-(Fe1-xVx)2O3 thin films driven by excess oxygen near the surface},
author = {Chamberlin, Sara E. and Kaspar, Tiffany C. and Bowden, Mark E. and Shutthanandan, V. and Kabius, Bernd C. and Heald, Steve M. and Keavney, David and Chambers, Scott A.},
abstractNote = {We examine the structure and composition of phase-pure epitaxial α-(Fe1-xVx)2O3 thin films deposited on α-Al2O3(0001) substrates by oxygen-plasma-assisted molecular beam epitaxy for 0 ≤ x ≤ ~0.5. The films crystallize in the corundum lattice, with vanadium substituting for iron throughout. Vanadium cations exhibit the expected 3+ charge state in the bulk, but exhibit higher valences nearer to the surface, most likely because of excess oxygen in interstitial sites near the surface. The extent of vanadium oxidation beyond the 3+ state is inversely proportional to x. The gradation of vanadium valence with depth may have an impact on local bonding geometries, and could be highly significant in this material’s efficiency as a photocatalyst.},
doi = {10.1063/1.4903839},
url = {https://www.osti.gov/biblio/1188913}, journal = {Journal of Applied Physics, 116(23):Article No. 233702},
number = ,
volume = ,
place = {United States},
year = {Sun Dec 21 00:00:00 EST 2014},
month = {Sun Dec 21 00:00:00 EST 2014}
}

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Cited by: 9 works
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Works referenced in this record:

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