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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Berry, Frank
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Topics
Publications (10/10 displayed)
- 2020Synthesis and characterisation of Sr4Fe3-xCrxO10-δ citations
- 2017Topotactic fluorine insertion into the channels of FeSb2O4-related materials.citations
- 2012Low temperature fluorination of Sr3Fe2O7-x with polyvinylidine fluoride: An X-ray powder diffraction and Mossbauer spectroscopy studycitations
- 2011The synthesis, structure, magnetic and electrical properties of FeSb2-xPbxO4citations
- 2011Structure and magnetic properties of the cubic oxide fluoride BaFeO2Fcitations
- 2010The ionic conductivity and local environment of cations in Bi9ReO17citations
- 2010LaSrCoFeO5, LaSrCoFeO5F and LaSrCoFeO5.5: new La-Sr-Co-Fe perovskitescitations
- 2009Synthesis and characterization of La0.8Sr1.2Co0.5M0.5O4−δ (M=Fe, Mn)citations
- 2001Investigation of defect structures formed by doping tetravalent ions into spinel-related iron oxides using atomistic simulation calculationscitations
- 2001Cation distribution and magnetic structure of the ferrimagnetic spinel NiCO₂O₄citations
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article
Synthesis and characterisation of Sr4Fe3-xCrxO10-δ
Abstract
<p>Ruddlesden-Popper type compounds have the general formula, A<sub>n+1</sub>M<sub>n</sub>O<sub>3n+1±x</sub> (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 (CrO<sub>4</sub><sup>2−</sup>) doping can be exploited to stabilise new n = 3 Ruddlesden-Popper systems, Sr<sub>4</sub>Fe<sub>3-x</sub>Cr<sub>x</sub>O<sub>10-δ</sub>: without chromate doping, a mixture of the n = 2 phase Sr<sub>3</sub>Fe<sub>2</sub>O<sub>7-x</sub> and perovskite-type SrFeO<sub>3-x</sub> 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,<sup>57</sup>Fe Mössbauer spectroscopy and X-ray absorption spectroscopy supporting the incorporation of Cr as CrO<sub>4</sub><sup>2−</sup>. 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.</p>