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Magnetic structure of K2NiF4-type iron(III) oxide halides

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.
848
FF3.18
MRS
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Li, Jing
Brese, Nathaniel E.
Kanatzidis, Mercouri G.
Jansen, Martin
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Li, Jing
Brese, Nathaniel E.
Kanatzidis, Mercouri G.
Jansen, Martin

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) Warrendale, PA, USA. MRS, FF3.18.

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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More information

Published date: 13 January 2005
Venue - Dates: Materials Research Society Symposium (2004 Fall), 2004-01-01 - 2004-01-01

Identifiers

Local EPrints ID: 28672
URI: http://eprints.soton.ac.uk/id/eprint/28672
PURE UUID: c3f34f76-ab3a-47f4-9e3e-17099643e765
ORCID for Andrew L. Hector: ORCID iD orcid.org/0000-0002-9964-2163

Catalogue record

Date deposited: 09 May 2006
Last modified: 20 Jul 2019 01:16

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