Doping of Bi4Fe5O13F with pentagonal Cairo lattice with Cr and Mn: Synthesis, structure and magnetic propertiesстатья
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Дата последнего поиска статьи во внешних источниках: 9 марта 2017 г.
Аннотация:The substitution of Cr3+ and Mn3+ for Fe3+ in the Bi4Fe5O13F oxyfluoride featuring the magnetically
frustrated pentagonal Cairo lattice is reported. Bi4Fe4.1Cr0.9O13F and Bi4Fe4.2Mn0.8O13F have been
prepared using a solid state reaction in inert atmosphere. Their crystal structures were studied with
transmission electron microscopy, powder X-ray diffraction and 57Fe Mössbauer spectroscopy (S.G. P42/
mbc, a = 8.27836(2) Å, c = 18.00330(9)Å, RF = 0.031 (Bi4Fe4.1Cr0.9O13F), a = 8.29535(3)Å, c = 18.0060(1) Å, RF = 0.027 (Bi4Fe4.2Mn0.8O13F)). The structures are formed by infinite rutile-like chains of the edgesharing BO6 octahedra (B—transition metal cations) linked by the Fe2O7 groups of two corner-sharing tetrahedra. The voids in thus formed framework are occupied by the Bi4F tetrahedra. The 57Fe Mössbauer spectroscopy reveals that Cr3+ and Mn3+ replace Fe3+ exclusively at the octahedral positions. The Mn- and Cr-doped compounds demonstrate antiferromagnetic ordering below TN = 165 K and 120 K, respectively.