Jarvis, A. ; Berry, F. J. ; Marco, J. F. ; Sanchez-Arenillas, M. ; Cibin, G. ; Clemens, O. ; Slater, P. R. (2020)
Synthesis and characterisation of Sr4Fe3-xCrxO10-δ: Stabilisation of n=3 Ruddlesden-Popper phases through Cr doping.
In: Journal of Solid State Chemistry, 287
doi: 10.1016/j.jssc.2020.121372
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Ruddlesden-Popper type compounds have the general formula, A(n+1)M(n)O(3n+1 +/- x) (typically A is a rare earth, alkaline earth, M is a transition metal), and are constructed of perovskite-type layers separated by rock salt type blocks. While n = 1, 2 phases are typically straightforward to prepare, the synthesis of higher order (n > 2) systems is difficult. In this paper we show that chromate (CrO42-) doping can be exploited to stabilise new n = 3 Ruddlesden-Popper systems, Sr4Fe3-xCrxO10-delta: without chromate doping, a mixture of the n = 2 phase Sr(3)Fe(2)O(7-x )and perovskite-type SrFeO3-x is obtained. This can be explained by the stabilisation of the central perovskite building block by chromate incorporation, similar to prior work on sulfate and carbonate doping in this system. The structure, and Fe/Cr oxidation states were evaluated by X-ray diffraction, Fe-57 Mossbauer spectroscopy and X-ray absorption spectroscopy supporting the incorporation of Cr as CrO42-. In order to examine the potential of these new systems for use as a SOFC cathode material, conductivity studies were carried out, which showed semiconducting behaviour with slightly higher conductivities than the sulfate doped counterparts.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2020 |
| Autor(en): | Jarvis, A. ; Berry, F. J. ; Marco, J. F. ; Sanchez-Arenillas, M. ; Cibin, G. ; Clemens, O. ; Slater, P. R. |
| Art des Eintrags: | Bibliographie |
| Titel: | Synthesis and characterisation of Sr4Fe3-xCrxO10-δ: Stabilisation of n=3 Ruddlesden-Popper phases through Cr doping |
| Sprache: | Englisch |
| Publikationsjahr: | Juli 2020 |
| Verlag: | Academic Press |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Solid State Chemistry |
| Jahrgang/Volume einer Zeitschrift: | 287 |
| DOI: | 10.1016/j.jssc.2020.121372 |
| Kurzbeschreibung (Abstract): | Ruddlesden-Popper type compounds have the general formula, A(n+1)M(n)O(3n+1 +/- x) (typically A is a rare earth, alkaline earth, M is a transition metal), and are constructed of perovskite-type layers separated by rock salt type blocks. While n = 1, 2 phases are typically straightforward to prepare, the synthesis of higher order (n > 2) systems is difficult. In this paper we show that chromate (CrO42-) doping can be exploited to stabilise new n = 3 Ruddlesden-Popper systems, Sr4Fe3-xCrxO10-delta: without chromate doping, a mixture of the n = 2 phase Sr(3)Fe(2)O(7-x )and perovskite-type SrFeO3-x is obtained. This can be explained by the stabilisation of the central perovskite building block by chromate incorporation, similar to prior work on sulfate and carbonate doping in this system. The structure, and Fe/Cr oxidation states were evaluated by X-ray diffraction, Fe-57 Mossbauer spectroscopy and X-ray absorption spectroscopy supporting the incorporation of Cr as CrO42-. In order to examine the potential of these new systems for use as a SOFC cathode material, conductivity studies were carried out, which showed semiconducting behaviour with slightly higher conductivities than the sulfate doped counterparts. |
| Freie Schlagworte: | Solid oxide fuel cell, Cathode, Ruddlesden-Popper, Chromate |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialdesign durch Synthese |
| Hinterlegungsdatum: | 04 Jun 2020 09:14 |
| Letzte Änderung: | 06 Dez 2021 13:31 |
| PPN: | |
| Projekte: | We would like to thank the University of Birmingham and EPSRC for funding (studentship for AJ)., The authors also thank EPSRC for funding: the JUICED Hub (Joint University Industry Consortium for Energy (Materials) and Devices Hub), EP/R023662/1)., We thank Diamond Light Source for the award of beam time as part of the Energy Materials Block Allocation Group., Financial support from the Spanish Ministry of Science and Innovation (project RTI2018-095303-B-51) is gratefully acknowledged. |
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