Charge evolution in the Y0.9Ba1.7Ca2.4Fe5O14.7 layered perovskite
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2024
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ACS Publications
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De Irujo-Labalde, Xabier Martínez, et al. «Charge Evolution in the Y0.9 Ba1.7 Ca2.4 Fe5 O14.7 Layered Perovskite». Chemistry of Materials, vol. 36, n.o 10, mayo de 2024, pp. 5184-91. DOI.org (Crossref), https://doi.org/10.1021/acs.chemmater.4c00552.
Abstract
The A mixed-valence Y0.9Ba1.7Ca2.4Fe5O14.7 layeredperovskite is obtained after topochemical oxygen insertion inY0.9Ba1.7Ca2.4Fe5O13 under ozone flow. The crystal structure has been determined with a combination of diffraction and microscopytechniques. Mössbauer spectroscopy reveals a 5 Fe3.8+ → 2 Fe3+ + 3Fe(4+δ)+ charge disproportionation accompanied by a smoothmagnetic and electronic transition beginning at about 125 K. Alayered arrangement of Fe3+ and Fe(4+δ)+ assisted by the layeredcharacter of the crystal structure is suggested. Two-dimensionalmagnetic interactions are detected from the magnetic behavior ofthe oxide and neutron diffraction experiments.
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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.chemmater.4c00552. Crystal structure and profile matching against PXRD of Y0.9Ba1.7Ca2.4Fe5O13, TGA results, EELS spectra at the O−K O−K edge, refined crystal structure parameters, Fe−O distances at 300 K, and lattice parameter variation between 80 and 450 K of Y0.9Ba1.7Ca2.4Fe5O14.7