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Electronic and Optical Properties of a Semiconducting Spinel (Fe 2 CrO 4 )

Journal Article · · Advanced Functional Materials
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  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab.
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Epitaxial chromium ferrite (Fe2CrO4), prepared by state-of-the-art oxygen plasma assisted molecular beam epitaxy, is shown to exhibit unusual electronic transport properties driven by the crystallographic structure and composition of the material. By replacing 1/3 of the Fe cations with Cr converts the host ferrimagnet from a metal into a semiconductor by virtue of its fixed valence (3+); Cr substitutes for Fe at B sites in the spinel lattice. Conversely, replacing 2/3 of the Fe cations with Cr results in an insulator. Three candidate conductive paths, all involving electron hopping between Fe2+ and Fe3+, are identified in Fe2CrO4. Moreover, Fe2CrO4 is shown to be photoconductive across the visible portion of the electromagnetic spectrum. As a result, this material is of potential interest for important photo-electrochemical processes such as water splitting.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1389315
Alternate ID(s):
OSTI ID: 1401506
OSTI ID: 1347835
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 9 Vol. 27; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Reversible Oxidation Quantified by Optical Properties in Epitaxial Fe 2 CrO 4+δ Films on (001) MgAl 2 O 4 journal February 2020
Chromium substituted iron oxide nanowires as affordable electrocatalysts for oxygen evolution reaction journal June 2019
Photocatalytic transformation of climbazole and 4-chlorophenol formation using a floral array of chromium-substituted magnetite nanoparticles activated with peroxymonosulfate journal January 2019
Probing the CZTS/CdS heterojunction utilizing photoelectrochemistry and x-ray absorption spectroscopy journal April 2018

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Related Subjects

36 MATERIALS SCIENCE
chromium ferrite
expitaxial film
photoelectronic properties