Hauptseite > Publikationsdatenbank > Crystal structure and high-temperature properties of the Ruddlesden–Popper phases Sr$_{3−x}$Y$_{x}$(Fe $_{1.25}$ Ni$_{0.75}$)O$_{7−δ}$ (0≤x≤0.75) > print

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100 1 _ |a Samain, Louise
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245 _ _ |a Crystal structure and high-temperature properties of the Ruddlesden–Popper phases Sr$_{3−x}$Y$_{x}$(Fe $_{1.25}$ Ni$_{0.75}$)O$_{7−δ}$ (0≤x≤0.75)
260 _ _ |a Orlando, Fla.
|c 2015
|b Academic Press
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520 _ _ |a Ruddlesden–Popper n=2 member phases Sr3−xYxFe1.25Ni0.75O7−δ, 0≤x≤0.75, have been investigated by X-ray and neutron powder diffraction, thermogravimetry and Mössbauer spectroscopy. Both samples as-prepared at 1300 °C under N2(g) flow and samples subsequently air-annealed at 900 °C were studied. The as-prepared x=0.75 phase is highly oxygen deficient with δ=1, the O1 atom site being vacant, and the Fe3+/Ni2+ ions having a square pyramidal coordination. For as-prepared phases with lower x values, the Mössbauer spectral data are in good agreement with the presence of both 5- and 4-coordinated Fe3+ ions, implying in addition a partial occupancy of the O3 atom sites that form the basal plane of the square pyramid. The air-annealed x=0.75 sample has a δ value of 0.61(1) and the structure has Fe/Ni ions in both square pyramids and octahedra. Mössbauer spectroscopy shows the phase to contain only Fe3+, implying that all Ni is present as Ni3+. Air-annealed phases with lower x values are found to contain both Fe3+ and Fe4+. For both the as-prepared and the air-annealed samples, the Y3+ cations are found to be mainly located in the perovskite block. The high-temperature thermal expansion of as-prepared and air-annealed x=0.75 phases were investigated by high-temperature X-ray diffraction and dilatometry and the linear thermal expansion coefficient determined to be 14.4 ppm K−1. Electrical conductivity measurements showed that the air-annealed samples have higher conductivity than the as-prepared ones.
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700 1 _ |a Svensson, Gunnar
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700 1 _ |a Hermann, Raphael
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