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oai:recercat.cat:2445/322252025-11-19T20:27:17Zcom_2072_1057col_2072_478822col_2072_478917col_2072_478923

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 Materials Propietats magnètiques Estructura cristal·lina (Sòlids) Materials Magnetic properties Layer structure (Solids) 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. 2012-10-09T07:54:06Z 2012-10-09T07:54:06Z 1992 2012-10-09T07:54:06Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 0021-8979 https://hdl.handle.net/2445/32225 080535 eng Reproducció del document publicat a: http://dx.doi.org/10.1063/1.352359 Journal of Applied Physics, 1992, vol. 72, num. 10, p. 4608-4614 http://dx.doi.org/10.1063/1.352359 (c) American Institute of Physics , 1992 info:eu-repo/semantics/openAccess 7 p. application/pdf application/pdf American Institute of Physics Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)