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Cation distribution and magnetization of BaFe12-2xCoxSnxO19 (x=0.9,1.28) single crystals
Sandiumenge Ortiz, Felip; Martínez Perea, Benjamin; Batlle Gelabert, Xavier; Galí Medina, Salvador, 1949-; Obradors, Xavier
Universitat de Barcelona
The distribution of Sn4+ cations within the five crystallographic sites of the magnetoplumbite (M) ‐like compound BaFe12−2xCoxSnxO19 has been analyzed using single‐crystal x‐ray‐diffraction data. The species Fe3+ and Co2+ cannot be distinguished using x rays because of their very similar atomic numbers; however, the calculation of the apparent valencies for the different sites allows an insight into the Co2+ cation segregation. The use of previous data from neutron powder diffraction allows a precise picture of the cation distribution, which indicates a pronounced site selectivity for both Sn4+ and Co2+ cations. The Sn4+ cations prefer the 4f2 sites and to a much lower extent the 12k sites, while they do not enter the octahedral 2a sites at all. Co2+ cations are distributed among tetrahedral and octahedral sites displaying a clear preference for the tetrahedral 4f1 sites. Magnetic measurements indicate that the compound still exhibits uniaxial anisotropy with the easy direction parallel to the c axis. Nevertheless, the magnetic structure shows a considerable degree of noncolinearity. A strong reduction of the magnetic anisotropy regarding that of the undoped compound is also detected.
Materials
Propietats magnètiques
Estructura cristal·lina (Sòlids)
Materials
Magnetic properties
Layer structure (Solids)
(c) American Institute of Physics , 1992
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info:eu-repo/semantics/publishedVersion
American Institute of Physics
         

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