期刊
ADVANCED FUNCTIONAL MATERIALS
卷 27, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201605040
关键词
chromium ferrite; epitaxial films; photoelectronic properties
类别
资金
- U.S. Department of Energy, Office of Science, Division of Materials Sciences and Engineering [10122]
- Department of Energy's Office of Biological and Environmental Research
- U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
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. 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. By contrast, 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.
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