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- W2624705684 abstract "Ammonolytic heating of Dion-Jacobson type layered perovskite LiLaTa2O7 produced oxynitride derivatives LiLaTa2O7−3xN2x□x via the substitution, 3O2− → 2N3− + □. The nitridation level increased with raising the temperature and/or increasing the time of reaction, reaching the limit at x ≈ 0.3 by the ammonolysis at 650 °C for 48 h. Upon the nitridation, tetragonal pristine lattice underwent a axis expansion together with c axis contraction. Neutron Rietveld refinement of LiLaTa2O7 and LiLaTa2O7−3xN2x (x = 0.09, 0.29) revealed that the Li-centered tetrahedra are gradually compressed along the 2-fold rotation axis, with the increase of x. Solid state 7Li nuclear magnetic resonance spectroscopy suggested that the anion vacancy resides mostly on the interlayer surface of perovskite block. As measured from the diffuse-reflectance spectroscopy, the nitridation induced marked reduction in the band gap magnitude, from 4.11 eV (x = 0) to 3.35 eV (x = 0.09) to 2.76 eV (x = 0.29)." @default.
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- W2624705684 date "2013-02-01" @default.
- W2624705684 modified "2023-10-10" @default.
- W2624705684 title "Preparation and neutron diffraction study of Dion-Jacobson type oxynitrides LiLaTa2O7−3xN2x (x=0.09, 0.29)" @default.
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- W2624705684 doi "https://doi.org/10.1016/j.materresbull.2012.11.069" @default.
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