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- W2017967175 abstract "La(Ni1−xAlx)O3 perovskites have been prepared from citrate precursors, decomposed and annealed at 200 bar of O2 pressure. The thermal analysis in H2/N2 flow of the members with x=0.1, 0.2 allowed us to identify two new oxygen deficient perovskite phases. At moderate temperatures (≈330°C) defect perovskites of general stoichiometry La(Ni1−xAlx)O2.5+x/2, containing Ni2+, have been stabilized. Although the term for x=0 (LaNiO2.5) is monoclinic and shows a 2a0×2a0×2a0 superstructure (a0 is the edge of the ideal perovskite unit, ≈4 Å), the materials for x=0.1, 0.2 exhibit a larger orthorhombic superstructure, 2√2a0×2√2a0×2a0. At higher temperatures (≈700°C) a further reduction process leads to a new defect phase for x=0.2, of composition La(Ni0.8Al0.2)O2.16(3), in which the formal oxidation state for Ni is 0.9(1)+. The unit cell is tetragonal, a=3.834(1), c=3.876(1) Å, and the structure is closely related to the `infinite layer' type, as shown from neutron powder diffraction data. The presence of some axial oxygens, probably coordinated to Al3+ cations, seems to stabilize the structure, acting as bridges between two adjacent layers." @default.
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- W2017967175 date "1998-07-01" @default.
- W2017967175 modified "2023-10-18" @default.
- W2017967175 title "Stabilization of Ni+ in defect perovskites La(Ni1−Al )O2+ with `infinite-layer' structure" @default.
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- W2017967175 doi "https://doi.org/10.1016/s0925-8388(98)00285-0" @default.
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