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Crystal structures and magnetic properties of the manganese oxide chlorides Sr2MnO3Cl and Sr4Mn3O8-yCl2

Crystal structures and magnetic properties of the manganese oxide chlorides Sr2MnO3Cl and Sr4Mn3O8-yCl2
Crystal structures and magnetic properties of the manganese oxide chlorides Sr2MnO3Cl and Sr4Mn3O8-yCl2
The crystal structures of the manganese oxide chlorides Sr2MnO3Cl and Sr4Mn3O8-yCl2 have been determined from neutron powder diffraction data collected at room temperature and at 2 K. The materials crystallize in the tetragonal space groups P4/nmm (Sr2MnO3Cl) and I4/mmm (Sr4Mn3O8-yCl2) and the structures are analogous to the n = 1 and n = 3 Ruddlesden-Popper phases Sr2MnO4 and Ca4Mn3O10. Both materials contain layers of highly distorted Mn(III)O5Cl octahedra. Sr4Mn3O8-yCl2, in addition, has a central layer of MnO6-delta octahedra with oxygen vacancies localized within the tetragonal plane. Consequently, the average coordination of the site is reduced to a mixture of 6-fold and 5-fold and some of the Mn atoms adopt pyramidal coordination. The level of oxygen deficiency within Sr(4)Mn(3)O(8-y)Cl(2)y = 0.44 confirms the Mn valence is predominantly +3. Magnetic susceptibility measurements indicate the onset of antiferromagnetic ordering (T-AF) in the materials at 80 and 90 K for Sr2MnO3Cl and Sr4Mn3O8-yCl2, respectively. Antiferromagnetic order is confirmed by the presence of magnetic scattering in the low-temperature neutron diffraction data. The magnetic structure of Sr2MnO3Cl has been determined, yielding an ordered manganese moment mu(z) = 3.74(5) mu(B) at 2 K. In contrast, the magnetic scattering exhibited by Sr4Mn3O8-yCl2 suggests a level of magnetic frustration.
cobalt oxychlorides, magnetoresistance
0897-4756
4249-4255
Knee, Christopher S.
de0aa2be-ddad-45dd-97f5-ae2f25de5207
Zhukov, Alexander A.
75d64070-ea67-4984-ae75-4d5798cd3c61
Weller, Mark T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Knee, Christopher S.
de0aa2be-ddad-45dd-97f5-ae2f25de5207
Zhukov, Alexander A.
75d64070-ea67-4984-ae75-4d5798cd3c61
Weller, Mark T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4

Knee, Christopher S., Zhukov, Alexander A. and Weller, Mark T. (2002) Crystal structures and magnetic properties of the manganese oxide chlorides Sr2MnO3Cl and Sr4Mn3O8-yCl2. Chemistry of Materials, 14 (10), 4249-4255. (doi:10.1021/cm020280c).

Record type: Article

Abstract

The crystal structures of the manganese oxide chlorides Sr2MnO3Cl and Sr4Mn3O8-yCl2 have been determined from neutron powder diffraction data collected at room temperature and at 2 K. The materials crystallize in the tetragonal space groups P4/nmm (Sr2MnO3Cl) and I4/mmm (Sr4Mn3O8-yCl2) and the structures are analogous to the n = 1 and n = 3 Ruddlesden-Popper phases Sr2MnO4 and Ca4Mn3O10. Both materials contain layers of highly distorted Mn(III)O5Cl octahedra. Sr4Mn3O8-yCl2, in addition, has a central layer of MnO6-delta octahedra with oxygen vacancies localized within the tetragonal plane. Consequently, the average coordination of the site is reduced to a mixture of 6-fold and 5-fold and some of the Mn atoms adopt pyramidal coordination. The level of oxygen deficiency within Sr(4)Mn(3)O(8-y)Cl(2)y = 0.44 confirms the Mn valence is predominantly +3. Magnetic susceptibility measurements indicate the onset of antiferromagnetic ordering (T-AF) in the materials at 80 and 90 K for Sr2MnO3Cl and Sr4Mn3O8-yCl2, respectively. Antiferromagnetic order is confirmed by the presence of magnetic scattering in the low-temperature neutron diffraction data. The magnetic structure of Sr2MnO3Cl has been determined, yielding an ordered manganese moment mu(z) = 3.74(5) mu(B) at 2 K. In contrast, the magnetic scattering exhibited by Sr4Mn3O8-yCl2 suggests a level of magnetic frustration.

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Published date: 2002
Keywords: cobalt oxychlorides, magnetoresistance

Identifiers

Local EPrints ID: 19787
URI: http://eprints.soton.ac.uk/id/eprint/19787
ISSN: 0897-4756
PURE UUID: 236b4c8b-b96f-4265-86fe-7a7e058dcce6

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Date deposited: 21 Feb 2006
Last modified: 08 Jan 2022 15:48

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Contributors

Author: Christopher S. Knee
Author: Alexander A. Zhukov
Author: Mark T. Weller

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