Reversible Oxidation Quantified by Optical Properties in Epitaxial Fe2CrO4+δ Films on (001) MgAl2O4 | Zendy

Mark D. Scafetta | Zendy; Tiffany C. Kaspar | Zendy; Mark Bowden | Zendy; Steven R. Spurgeon | Zendy; Bethany E. Matthews | Zendy; Scott A. Chambers | Zendy

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Reversible Oxidation Quantified by Optical Properties in Epitaxial Fe₂CrO_4+δ Films on (001) MgAl₂O₄

Author(s) -

Mark D. Scafetta,

Tiffany C. Kaspar,

Mark Bowden,

Steven R. Spurgeon,

Bethany E. Matthews,

Scott A. Chambers

Publication year - 2020

Publication title -

acs omega

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.779

H-Index - 40

ISSN - 2470-1343

DOI - 10.1021/acsomega.9b03299

Subject(s) - valence (chemistry) , infrared , epitaxy , oxidation state , materials science , molecular beam epitaxy , lattice (music) , thermal oxidation , lattice constant , analytical chemistry (journal) , infrared spectroscopy , absorption spectroscopy , thin film , chemistry , optoelectronics , optics , diffraction , nanotechnology , metal , physics , organic chemistry , layer (electronics) , chromatography , silicon , acoustics , metallurgy

We report on the structural and optical properties of Fe 2 CrO 4+δ epitaxial films grown by molecular beam epitaxy on MgAl 2 O 4 (001) as a function of δ (average cation valence). The average Fe valence is linked to the out-of-plane lattice parameter and the extent of light absorption in the infrared spectral region. Over-oxidized films (0 < δ < 0.5) exhibit smaller lattice parameters and suppressed infrared absorption. The lattice parameter is found to differ for films of equivalent oxidation state but different thermal histories. We discuss the behavior of a novel infrared transition present at ∼0.6 eV in Fe 2 CrO 4 films deposited at or above 400 °C. An optical transition found in all films at 0.9 eV independent of the synthesis temperature can be used to quantify the oxidation state of Fe 2 CrO 4+δ . This research provides new insights into the atomic structure, optical processes, oxidation states, electronic structure, and application potential of Fe 2 CrO 4+δ .

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