2026-04-17T03:49:44Zhttps://recercat.cat/oai/request

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

00925njm 22002777a 4500 dc Sandiumenge Ortiz, Felip author Martínez Perea, Benjamin author Batlle Gelabert, Xavier author Galí Medina, Salvador, 1949- author Obradors, Xavier author 2012-10-09T07:54:06Z 2012-10-09T07:54:06Z 1992 2012-10-09T07:54:06Z 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) Cation distribution and magnetization of BaFe12-2xCoxSnxO19 (x=0.9,1.28) single crystals