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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 &lt; δ &lt; 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 .

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

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