Synthesis and characterisation of Sr4Fe3-xCrxO10-δ: Stabilisation of n=3 Ruddlesden-Popper phases through Cr doping

被引:2
|
作者
Jarvis, A. [1 ]
Berry, F. J. [1 ]
Marco, J. F. [2 ]
Sanchez-Arenillas, M. [2 ]
Cibin, G. [3 ]
Clemens, O. [4 ,5 ]
Slater, P. R. [1 ]
机构
[1] Univ Birmingham, Sch Chem, Birmingham B15 2TT, W Midlands, England
[2] CSIC, Inst Quim Fis Rocasolano, Serrano 119, Madrid 28006, Spain
[3] Diamond Light Source Ltd, Didcot OX11 0DE, Oxon, England
[4] Tech Univ Darmstadt, Mat Design Synth, Alarich Weiss Str 2, D-64287 Darmstadt, Germany
[5] Karlsruhe Inst Technol, Inst Nanotechnol, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany
基金
英国工程与自然科学研究理事会;
关键词
Solid oxide fuel cell; Cathode; Ruddlesden-Popper; Chromate; CRYSTAL-CHEMISTRY; OXIDE; PEROVSKITE; OXYCARBONATES; CONDUCTIVITY; TRANSPORT; CHROMIUM; SULFATE; SYSTEMS; SERIES;
D O I
10.1016/j.jssc.2020.121372
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
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.
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页数:6
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