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

S. E. Chamberlin; T. C. Kaspar; M. E. Bowden; V. Shutthanandan; B. Kabius; S. Heald; D. J. Keavney; S. A. Chambers

doi:10.1063/1.4903839

Structural perturbations of epitaxial α-(Fe_1-xV_x)₂O₃ thin films driven by excess oxygen near the surface

S. E. Chamberlin, T. C. Kaspar, M. E. Bowden, V. Shutthanandan, B. Kabius, S. Heald, D. J. Keavney, S. A. Chambers

Materials Research Institute (MRI)

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

We examine the structure and composition of phase-pure epitaxial α-(Fe_1-xV_x)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 has an impact on local bonding geometries, and could be highly significant in this material's efficiency as a photocatalyst.

Original language	English (US)
Article number	233702
Journal	Journal of Applied Physics
Volume	116
Issue number	23
DOIs	https://doi.org/10.1063/1.4903839
State	Published - Dec 21 2014

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1063/1.4903839

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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 has an impact on local bonding geometries, and could be highly significant in this material's efficiency as a photocatalyst.",

author = "Chamberlin, {S. E.} and Kaspar, {T. C.} and Bowden, {M. E.} and V. Shutthanandan and B. Kabius and S. Heald and Keavney, {D. J.} and Chambers, {S. A.}",

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T1 - Structural perturbations of epitaxial α-(Fe1-xVx)2O3 thin films driven by excess oxygen near the surface

AU - Chamberlin, S. E.

AU - Kaspar, T. C.

AU - Bowden, M. E.

AU - Shutthanandan, V.

AU - Kabius, B.

AU - Heald, S.

AU - Keavney, D. J.

AU - Chambers, S. A.

PY - 2014/12/21

Y1 - 2014/12/21

N2 - 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 has an impact on local bonding geometries, and could be highly significant in this material's efficiency as a photocatalyst.

AB - 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 has an impact on local bonding geometries, and could be highly significant in this material's efficiency as a photocatalyst.

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Structural perturbations of epitaxial α-(Fe_1-xV_x)₂O₃ thin films driven by excess oxygen near the surface

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