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Issue 37, 2018
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Deciphering local complex order by HAADF in a disordered mixed polyanion iron oxide: Sr4Fe2[Fe0.5(SO4)0.25(CO3)0.25]O7.25

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Abstract

A layered iron compound involving two divalent polyanions (carbonate and sulfate anions) was synthesized by solid state chemistry in a closed ampule in the form of a ceramic. The Sr4Fe2[Fe0.5(SO4)0.25(CO3)0.25]O7.25 compound derives from the third term of the Ruddlesden and Popper family, Sr4Fe3O10. A multiscale approach through transmission electron microscopy (TEM) and powder neutron diffraction (PND) studies shows that SO4 and CO3 groups substitute for the iron polyhedron of the central layer of the perovskite blocks and the absence of long range ordering between sulfate and carbonates and FeO5 groups. Nevertheless, waves disturbing the expected periodicity of the atomic layer are evidenced in HAADF images. An accurate analysis of these images provides a view of the local cationic order correlated with SO4 and CO3 for FeO5 substitution.

Graphical abstract: Deciphering local complex order by HAADF in a disordered mixed polyanion iron oxide: Sr4Fe2[Fe0.5(SO4)0.25(CO3)0.25]O7.25

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Publication details

The article was received on 25 May 2018, accepted on 07 Aug 2018 and first published on 17 Aug 2018


Article type: Paper
DOI: 10.1039/C8DT02146E
Citation: Dalton Trans., 2018,47, 13088-13093
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    Deciphering local complex order by HAADF in a disordered mixed polyanion iron oxide: Sr4Fe2[Fe0.5(SO4)0.25(CO3)0.25]O7.25

    B. Gonano, Y. Bréard, D. Pelloquin, V. Caignaert, O. Pérez, A. Pautrat, P. Bazin, E. Suard and P. Boullay, Dalton Trans., 2018, 47, 13088
    DOI: 10.1039/C8DT02146E

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