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Comprehensive Study of Oxygen Storage in YbFe2O4+x (x ≤ 0.5): Unprecedented Coexistence of FeOn Polyhedra in One Single Phase
- Source :
- Journal of the American Chemical Society, Journal of the American Chemical Society, 2017, 139 (47), pp.17031-17043. ⟨10.1021/jacs.7b06409⟩, Journal of the American Chemical Society, American Chemical Society, 2017, 139 (47), pp.17031-17043. ⟨10.1021/jacs.7b06409⟩
- Publication Year :
- 2017
- Publisher :
- American Chemical Society (ACS), 2017.
-
Abstract
- The multiferroic LuFe2.5+2O4 was recently proposed as a promising material for oxygen storage due to its easy reversible oxidation into LuFe3+2O4.5. We have investigated the similar scenario in YbFe2O4+x, leading to a slightly greater oxygen storage (OSC) capacity of 1434 μmol O/g. For the first time, the structural model of LnFe2O4.5 was fully understood by high-resolution microscopy images, and synchrotron and neutron diffraction experiments, as well as maximum entropy method. The oxygen uptake promotes a reconstructive shearing of the [YbO2] sub-units controlled by the adaptive Ln/Fe oxygen coordination and the Fe2/3+ redox. After oxidation, the rearrangement of the Fe coordination polyhedra is unique such that all available FeOn units (n = 6, 5, 4 in octahedra, square pyramids, trigonal bipyramids, tetrahedra) were identified in modulated rows growing in plane. This complex pseudo-ordering gives rise to short-range antiferromagnetic correlation within an insulating state.
- Subjects :
- Physical and chemical processes
Oxygen storage
Neutron diffraction
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
01 natural sciences
Biochemistry
Oxygen
Redox
Catalysis
Colloid and Surface Chemistry
Oxidation
Antiferromagnetism
Multiferroics
Crystal structure
[CHIM.MATE]Chemical Sciences/Material chemistry
General Chemistry
021001 nanoscience & nanotechnology
0104 chemical sciences
Crystallography
Octahedron
chemistry
Tetrahedron
Layers
0210 nano-technology
Subjects
Details
- ISSN :
- 15205126 and 00027863
- Volume :
- 139
- Database :
- OpenAIRE
- Journal :
- Journal of the American Chemical Society
- Accession number :
- edsair.doi.dedup.....fb0e62679fdc3edf36b8fcc6ee1d946d