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- W2000395639 abstract "Abstract Structural, transport, and magnetic data for the system La 2−x Sr x NiO 4 , 0 ≤ x ≤ 1.6, are reported. The oxygen content of the system was controlled by annealing under various oxygen partial pressures below 150 atm and was determined by iodometric titration. A Rietveld analysis of the room-temperature powder X-ray diffraction data showed that the tetragonal distortion of the NiO 6 octahedra decreases monotonically with increasing x for 0 ≤ x ≤ 1.4, but the La(Sr)O(2) bond length increases anomalously in the interval 0 ≤ x ≤ 0.6. A semiconductor-metal transition decreases monotonically with increasing x from about 675 K(x=0) to 20 K(x=1.2). Samples with x > 1.0 exhibited a weak ferromagnetic moment at 5 K and the onset of a positive component in the Hall effect. Comparison of the La 2−x Sr x CuO 4 and La 2−x Sr x NiO 4 systems shows that the superconductive copper oxides have the equilibrium Cu 3+ + O 2− = Cu 2+ + O − shifted to the right and, for x = 0, antiferromagnetic correlation in a half-filled σ x 2 − y 2 band whereas the weakly ferromagnetic nickel oxides have the equilibrium Ni 4+ + O 2− = Ni 3+ + O − shifted to the right, but ferromagnetic correlations in a quarter-filled σ∗ band." @default.
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- W2000395639 date "1990-03-01" @default.
- W2000395639 modified "2023-09-26" @default.
- W2000395639 title "Crystal chemistry and physical properties of La2−xSrxNiO4 (0 ≤ x ≤ 1.6)" @default.
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- W2000395639 doi "https://doi.org/10.1016/0025-5408(90)90100-g" @default.
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