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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.
2012-10-09
Materials
Propietats magnètiques
Estructura cristal·lina (Sòlids)
Materials
Magnetic properties
Layer structure (Solids)
(c) American Institute of Physics , 1992
Article
Article - Published version
American Institute of Physics
         

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