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Magnetic Structure of K2NiF4-type Iron(III) Oxide Halides

Published online by Cambridge University Press:  01 February 2011

Andrew L. Hector
Andrew L. Hector*
Affiliation:
School of Chemistry, University of Southampton, Highfield, Southampton SO 17 1BJ, UK
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 848: Symposium FF – Solid-State Chemistry of Inorganic Materials V , 2004 , FF3.18
Copyright
Copyright © Materials Research Society 2005

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References

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