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
Article, Bibliographie
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.
| Item Type: | Article |
|---|---|
| Erschienen: | 2020 |
| Creators: | Jarvis, A. ; Berry, F. J. ; Marco, J. F. ; Sanchez-Arenillas, M. ; Cibin, G. ; Clemens, O. ; Slater, P. R. |
| Type of entry: | Bibliographie |
| Title: | Synthesis and characterisation of Sr4Fe3-xCrxO10-δ: Stabilisation of n=3 Ruddlesden-Popper phases through Cr doping |
| Language: | English |
| Date: | July 2020 |
| Publisher: | Academic Press |
| Journal or Publication Title: | Journal of Solid State Chemistry |
| Volume of the journal: | 287 |
| DOI: | 10.1016/j.jssc.2020.121372 |
| 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. |
| Uncontrolled Keywords: | Solid oxide fuel cell, Cathode, Ruddlesden-Popper, Chromate |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Materialdesign durch Synthese |
| Date Deposited: | 04 Jun 2020 09:14 |
| Last Modified: | 06 Dec 2021 13:31 |
| PPN: | |
| Projects: | 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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