Article (Scientific journals)
Crystal structure and high-temperature properties of the Ruddlesden–Popper phases Sr3−xYx(Fe1.25Ni0.75)O7−δ (0≤x≤0.75)
Samain, Louise; Amshoff, Philipp; Biendicho, Jordi J. et al.
2015In Journal of Solid State Chemistry, 227, p. 45 - 54
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Keywords :
Ruddlesden–Popper structure; Oxygen non-stoichiometry; Crystal structure; Mössbauer spectroscopy; Electrical conductivity; Thermal expansion
Abstract :
[en] Abstract 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 14.4ppmK−1. Electrical conductivity measurements showed that the air-annealed samples have higher conductivity than the as-prepared ones.
Disciplines :
Chemistry
Author, co-author :
Samain, Louise ;  Université de Liège - ULiège > Centre européen en archéométrie
Amshoff, Philipp
Biendicho, Jordi J.
Tietz, Frank
Mahmoud, Abdelfattah  ;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Hermann, Raphaël ;  Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)
Istomin, Sergey Ya
Grins, Jekabs
Svensson, Gunnar
Language :
English
Title :
Crystal structure and high-temperature properties of the Ruddlesden–Popper phases Sr3−xYx(Fe1.25Ni0.75)O7−δ (0≤x≤0.75)
Publication date :
2015
Journal title :
Journal of Solid State Chemistry
ISSN :
0022-4596
eISSN :
1095-726X
Publisher :
Academic Press, San Diego, United States - California
Volume :
227
Pages :
45 - 54
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 15 January 2018

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