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Temperature dependence of the crystal and magnetic structures of the antiferromagnetic oxides Pb4Fe3O8X, X = Cl and Br

Temperature dependence of the crystal and magnetic structures of the antiferromagnetic oxides Pb4Fe3O8X, X = Cl and Br
Temperature dependence of the crystal and magnetic structures of the antiferromagnetic oxides Pb4Fe3O8X, X = Cl and Br
The crystal and magnetic structures of the antiferromagnetic mineral hematophanite, Pb4Fe3O8Cl, and its bromide analogue Pb4Fe3O8Br have been studied over the temperature range 10-650 K using neutron powder diffraction. The materials consist of truncated Pb4Fe3O8 triple perovskite blocks separated by a CsCl-type Pb2X (X = Cl or, Br) layer. The basal oxygen of the central FeO6 octahedra exhibits disorder consistent with alternate clockwise/anticlockwise rotations around the c-axis; the degree of rotation increasing upon cooling for both materials, i.e. From 10.3 degrees at 650 K to 12.8 degrees at 10 K for Pb4Fe3O8Br. The order of the Fe moments evolving as a functiort of temperature has allowed the T-Neel (T-N) of Pb4Fe3O8Br to be determined for the first time as 600(5) K, a value within experimental error of the T-N, for Pb4Fe3O8Cl. The moments are coupled antiferromagnetically along all three crystallographic directions, resulting in a magnetic structure related to that of the nuclear structure by a(mag) = root 2a(nuc), and c(mag) = 2c(nuc). The magnetic structure is refined with spins perpendicular to the c-axis, Living ordered moments of 3.94(3) mu (B) for Pb4Fe3O8Cl and 4.10(3) mu (B) for Pb4Fe3O8Br at 10 K consistent with the presence of high spin Fe3+.
powder-diffraction, neutron, rusr2gdcu2o8, perovskite, ray
2350-2357
Knee, Christopher S.
de0aa2be-ddad-45dd-97f5-ae2f25de5207
Weller, Mark T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Knee, Christopher S.
de0aa2be-ddad-45dd-97f5-ae2f25de5207
Weller, Mark T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4

Knee, Christopher S. and Weller, Mark T. (2001) Temperature dependence of the crystal and magnetic structures of the antiferromagnetic oxides Pb4Fe3O8X, X = Cl and Br. Journal of Materials Chemistry, 11 (9), 2350-2357. (doi:10.1039/b102092g).

Record type: Article

Abstract

The crystal and magnetic structures of the antiferromagnetic mineral hematophanite, Pb4Fe3O8Cl, and its bromide analogue Pb4Fe3O8Br have been studied over the temperature range 10-650 K using neutron powder diffraction. The materials consist of truncated Pb4Fe3O8 triple perovskite blocks separated by a CsCl-type Pb2X (X = Cl or, Br) layer. The basal oxygen of the central FeO6 octahedra exhibits disorder consistent with alternate clockwise/anticlockwise rotations around the c-axis; the degree of rotation increasing upon cooling for both materials, i.e. From 10.3 degrees at 650 K to 12.8 degrees at 10 K for Pb4Fe3O8Br. The order of the Fe moments evolving as a functiort of temperature has allowed the T-Neel (T-N) of Pb4Fe3O8Br to be determined for the first time as 600(5) K, a value within experimental error of the T-N, for Pb4Fe3O8Cl. The moments are coupled antiferromagnetically along all three crystallographic directions, resulting in a magnetic structure related to that of the nuclear structure by a(mag) = root 2a(nuc), and c(mag) = 2c(nuc). The magnetic structure is refined with spins perpendicular to the c-axis, Living ordered moments of 3.94(3) mu (B) for Pb4Fe3O8Cl and 4.10(3) mu (B) for Pb4Fe3O8Br at 10 K consistent with the presence of high spin Fe3+.

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More information

Published date: 2001
Keywords: powder-diffraction, neutron, rusr2gdcu2o8, perovskite, ray

Identifiers

Local EPrints ID: 19533
URI: http://eprints.soton.ac.uk/id/eprint/19533
PURE UUID: 45331932-d720-48e3-8fbe-746e5801a511

Catalogue record

Date deposited: 15 Feb 2006
Last modified: 15 Jul 2019 19:27

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