Magnetic structure of K2NiF4-type iron(III) oxide halides
Magnetic structure of K2NiF4-type iron(III) oxide halides
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.
FF3.18
Materials Research Society
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
13 January 2005
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Hector, Andrew L.
(2005)
Magnetic structure of K2NiF4-type iron(III) oxide halides.
In,
Li, Jing, Brese, Nathaniel E., Kanatzidis, Mercouri G. and Jansen, Martin
(eds.)
Solid-State Chemistry of Inorganic Materials.
(Materials Research Society Symposium Proceedings, 848, V)
Materials Research Society Symposium (2004 Fall) (01/01/04 - 01/01/04)
Warrendale, PA, USA.
Materials Research Society, .
Record type:
Book Section
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.
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Published date: 13 January 2005
Venue - Dates:
Materials Research Society Symposium (2004 Fall), Warrendale, PA , USA, 2004-01-01 - 2004-01-01
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Local EPrints ID: 28672
URI: http://eprints.soton.ac.uk/id/eprint/28672
PURE UUID: c3f34f76-ab3a-47f4-9e3e-17099643e765
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Date deposited: 09 May 2006
Last modified: 10 Apr 2024 01:35
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Contributors
Editor:
Jing Li
Editor:
Nathaniel E. Brese
Editor:
Mercouri G. Kanatzidis
Editor:
Martin Jansen
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