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- W2949541736 abstract "New Dion−Jacobson-type layered perovskite oxyfluorides, ASrNb2O6F (A = Li, Na, and Rb), have been prepared by conventional solid-state reaction, and their fluorine distribution in an anion sublattice was studied by performing 19F MAS NMR spectroscopic analyses and lattice energy calculations to probe the evolution of interlayer cationic conductivitiy upon fluorine substitution. From these comparative studies, it is found that the fluorine anions are randomly distributed in two distinct crystallographic sites among three possible sites in the oxyfluoride lattice, that is, the equatorial site of NbO6 octahedra (Oequatorial) and the central site of two corner-sharing NbO6 octahedra along the c axis (Ocenter). On the other hand, the substituted fluorine does not prefer to occupy the Oapex site, which interacts ionically with an alkali metal cation (A+) in the interlayer, because the (Nb−Oapex) bond is too strongly covalent to be replaced by the ionic Nb−F bond. We have also compared systematically the Li and Na ion conductivities for the oxyfluorides, ASrNb2O6F, with those for the corresponding oxides, ALaNb2O7 (A = Li and Na), and found that the fluorination of the perovskite layer gives rise to an enhancement of ionic transport in the interlayer space." @default.
- W2949541736 created "2019-06-27" @default.
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- W2949541736 date "2001-02-10" @default.
- W2949541736 modified "2023-10-16" @default.
- W2949541736 title "New Dion−Jacobson-Type Layered Perovskite Oxyfluorides, ASrNb<sub>2</sub>O<sub>6</sub>F (A = Li, Na, and Rb)" @default.
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- W2949541736 doi "https://doi.org/10.1021/cm000673g" @default.
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