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• W2955883626 abstract "Ruddlesden–Popper oxides, ( A O)( AB O 3 ) n , occupy a prominent place in the landscape of materials research because of their intriguing potential applications. Compositional modifications to the cation sublattices, A or B , have been explored in order to achieve enhanced functionalities. However, changes to the anionic sublattice have been much less explored. In this work, new oxygen-deficient manganese Ruddlesden–Popper-related phases, La 0.5 Ca 2.5 Mn 2 O 6.5 and La 0.5 Ca 2.5 Mn 2 O 6.25 , have been synthesized by controlled reduction of the fully oxidized n = 2 term La 0.5 Ca 2.5 Mn 2 O 7 . A complete structural and compositional characterization, by means of neutron diffraction, electron diffraction and atomically resolved scanning transmission electron microscopy and electron energy-loss spectroscopy techniques, allows the proposition of a topotactic reduction pathway through preferential oxygen removal in the [MnO 2 ] layers along [031] and [0{bar 1}3] directions. The gradual decrease of the Mn oxidation state, accommodated by short-range ordering of anionic vacancies, reasonably explains the breaking of ferromagnetic interactions reinforcing the emergence of antiferromagnetic ones. Additional short-range order–disorder phenomena of La and Ca cations have been detected in the reduced La 0.5 Ca 2.5 Mn 2 O 7−δ , as previously reported in the parent compound." @default.
• W2955883626 created "2019-07-12" @default.
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• W2955883626 date "2019-06-26" @default.
• W2955883626 modified "2023-10-16" @default.
• W2955883626 title "Complex structural ordering of the oxygen deficiency in La0.5Ca2.5Mn2O7−δ Ruddlesden–Popper phases" @default.
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• W2955883626 doi "https://doi.org/10.1107/s2053273319006089" @default.
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• W2955883626 hasPublicationYear "2019" @default.
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