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Inorganics 2018, 6(3), 89; https://doi.org/10.3390/inorganics6030089

Crystal Structure and Coordination of B-Cations in the Ruddlesden–Popper Phases Sr3−xPrx(Fe1.25Ni0.75)O7−δ (0 ≤ x ≤ 0.4)

1
Department of Materials and Environmental Chemistry, Stockholm University, S-106 91 Stockholm, Sweden
2
Catalonia Institute for Energy Research, Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besos, Spain
3
The ISIS Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK
4
GREENMAT, Institute of Chemistry B63APTIS, Institute of Physics, Universitè de Liège, B-4000 Liege, Belgium
5
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
6
Department of Chemistry, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
*
Author to whom correspondence should be addressed.
Received: 5 July 2018 / Revised: 22 August 2018 / Accepted: 24 August 2018 / Published: 31 August 2018
(This article belongs to the Special Issue Mixed Metal Oxides)
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Abstract

Compounds Sr3−xPrxFe1.25Ni0.75O7−δ with 0 ≤ x ≤ 0.4 and Ruddlesden–Popper n = 2 type structures were synthesized and investigated by X-ray and neutron powder diffraction, thermogravimetry, and Mössbauer spectroscopy. Both samples, prepared at 1300 °C under N2(g) flow and samples subsequently air-annealed at 900 °C, were studied. The structures contained oxygen vacancies in the perovskite layers, and the Fe/Ni cations had an average coordination number less than six. The oxygen content was considerably higher for air-annealed samples than for samples prepared under N2, 7 − δ = ~6.6 and ~5.6 per formula unit, respectively. Mössbauer data collected at 7 K, below magnetic ordering temperatures, were consistent with X-ray powder diffraction (XRD) and neutron powder diffraction (NPD) results. The electrical conductivity was considerably higher for the air-annealed samples and was for x = 0.1~30 S·cm−1 at 500 °C. The thermal expansion coefficients were measured in air between room temperature and 900 °C and was found to be 20–24 ppm·K−1 overall. View Full-Text
Keywords: Ruddlesden–Popper structure; oxygen non-stoichiometry; crystal structure; Mössbauer spectroscopy; electrical conductivity; thermal expansion Ruddlesden–Popper structure; oxygen non-stoichiometry; crystal structure; Mössbauer spectroscopy; electrical conductivity; thermal expansion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Svensson, G.; Samain, L.; Biendicho, J.J.; Mahmoud, A.; Hermann, R.P.; Istomin, S.Y.; Grins, J. Crystal Structure and Coordination of B-Cations in the Ruddlesden–Popper Phases Sr3−xPrx(Fe1.25Ni0.75)O7−δ (0 ≤ x ≤ 0.4). Inorganics 2018, 6, 89.

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