Sökning: WFRF:(Mahmoud Abdelfattah)
> (2015) >
Crystal structure a...
Crystal structure and high-temperature properties of the Ruddlesden-Popper phases Sr3-xYx(Fe1.25Ni0.75)O7-delta (0 <= x <= 0.75)
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- Samain, Louise (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Amshoff, Philipp (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Biendicho, Jordi J. (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),STFC Rutherford Appleton Laboratory, England
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Tietz, Frank (författare)
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Mahmoud, Abdelfattah (författare)
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Hermann, Raphael P. (författare)
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- Istomin, Sergey Ya. (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Lomonosov Moscow State University, Russia
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- Grins, Jekabs (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Svensson, Gunnar (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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(creator_code:org_t)
- Elsevier BV, 2015
- 2015
- Engelska.
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Ingår i: Journal of Solid State Chemistry. - : Elsevier BV. - 0022-4596 .- 1095-726X. ; 227, s. 45-54
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Ruddlesden-Popper n=2 member phases Sr3-xYxFe1.25Ni0.75O7-delta, 0 <= x <= 0.75, have been investigated by X-ray and neutron powder diffraction, thermogravimetry and Mossbauer spectroscopy. Both samples as-prepared at 1300 degrees C under N-2(g) flow and samples subsequently air-annealed at 900 degrees C were studied. The as-prepared x=0.75 phase is highly oxygen deficient with delta=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 Mossbauer 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 delta value of 0.61(1) and the structure has Fe/Ni ions in both square pyramids and octahedra. Mossbauer 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.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Nyckelord
- Ruddlesden-Popper structure
- Oxygen non-stoichiometry
- Crystal structure
- Mossbauer spectroscopy
- Electrical conductivity
- Thermal expansion
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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