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Crystal Structure and Coordination of B-Cations in the Ruddlesden-Popper Phases Sr3-xPrx(Fe1.25Ni0.75)O7- (0 x 0.4)
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0003-0598-4769
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Catalonia Institute for Energy Research, Spain; STFC Rutherford Appleton Laboratory, UK.
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Number of Authors: 72018 (English)In: Inorganics, ISSN 2304-6740, Vol. 6, no 3, article id 89Article in journal (Refereed) Published
Abstract [en]

Compounds Sr3-xPrxFe1.25Ni0.75O7- 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 Mossbauer spectroscopy. Both samples, prepared at 1300 degrees C under N-2(g) flow and samples subsequently air-annealed at 900 degrees 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 N-2, 7 - = similar to 6.6 and similar to 5.6 per formula unit, respectively. Mossbauer 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 similar to 30 Scm(-1) at 500 degrees C. The thermal expansion coefficients were measured in air between room temperature and 900 degrees C and was found to be 20-24 ppmK(-1) overall.

Place, publisher, year, edition, pages
2018. Vol. 6, no 3, article id 89
Keywords [en]
Ruddlesden-Popper structure, oxygen non-stoichiometry, crystal structure, Mossbauer spectroscopy, electrical conductivity, thermal expansion
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-162944DOI: 10.3390/inorganics6030089ISI: 000448399100026OAI: oai:DiVA.org:su-162944DiVA, id: diva2:1270549
Available from: 2018-12-13 Created: 2018-12-13 Last updated: 2020-01-30Bibliographically approved

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Svensson, GunnarSamain, LouiseBiendicho, Jordi JacasGrins, Jekabs
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