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Persistent URL http://purl.org/net/epubs/work/35705
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Record Id 35705
Title Magnetic structure of K2NiF4-type iron(III) oxide halides
Abstract Materials with the K2NiF4 structure and a magnetic atom on the B site are examples of a pseudo-2D square lattice. The nearest neighbour interactions are very strong and, with iron(III), usually lead to xy antiferromagnetic coupling. We have used powder neutron diffraction at 2 K to study the magnetic structures of A2FeO3X where A is Ca or Sr and X is Cl or Br. There are two common magnetic structures for K2NiF4-type xy antiferromagnets, those of La2NiO4 and La2CuO4, here we find the latter. In Sr2FeO3F we find a more complex situation. The reflections corresponding to the La2CuO4 magnetic structure are present from 2 K to ambient temperature, but a further set of peaks decays from 2 K to around 60 K. These correspond to a magnetic structure with a doubled c-axis. This is due to a magnetic structure in which La2NiO4- and La2CuO4-type stacking alternate. To our knowledge this is the only example of this magnetic structure type.
Keywords Materials , ISIS 2006
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Language English (EN)
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Paper In Conference Proceedings In Symposium on Solid-State Chemistry of Inorganic Materials V. Proceedings, Vol. 848 pp 157-163, Published 2005, Boston, MA, 28-2 Nov 2004, (2005). 2005