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Figure 1
(a) Unit cell and seven distinct Me sites for SrMe2Fe16O27 (Me = Mg, Co, Ni, Zn), the green spheres are Sr and the colored polyhedra show the Me sites and their relative coordination. Oxygen atoms at the corners of polyhedra are not shown. (b) Uniaxial magnetic ordering of SrMg2Fe16O27, SrNi2Fe16O27 and SrZn2Fe16O27. (c) Planar magnetic ordering of SrCo2Fe16O27. The brackets in the right part of the figure indicates the common hexaferrite layers. Figure prepared using VESTA (Momma & Izumi, 2011BB42).

IUCrJ
Volume 6| Part 3| May 2019| Pages 492-499
ISSN: 2052-2525
https://doi.org/10.1107/S2052252519003130