Crystal and magnetic structures of iron layered polyanions compounds
The potential of perovskite systems and derivatives to accommodate oxyanions (Carbonates, phosphates, borates…) which leads to the design of new materials with exotic physical properties is very high and attractive. We have investigated the Sr-Fe-O-S system focusing our attention on the Ruddlesden-Popper family. The RP3 related compound Sr4Fe2O6(SO4) has been stabilized as powder ceramic and is derivative of the RP3 phase: Sr4Fe3O10 in which substitution of SO4 groups for FeO6 octahedra occurs in the central perovskite layer (shown by TEM analysis and X-ray diffraction). Similar phenomenon has been previously reported for iron oxycarbonate. In the same approach, another oxyanions compound, the compound Ca4Fe5.5O6S4 has been stabilized as polycrystalline powder. It is characterized by an orthorhombic symmetry Cmcm (11.1;11.2 and 17.5Å) and can be described as alternating FeO4S2 (top shared) and FeO2S4 (edge shared) octahedral layers. This new compound exhibits complex magnetic behavior in a large temperature range with three transitions as visible in the ZFC curve.
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breard; Gonano; MONNIER Laurine; C. Moussa; PELLOQUIN Denis and SUARD Emmanuelle. (2016). Crystal and magnetic structures of iron layered polyanions compounds. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2474
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