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Topotactic oxidative and reductive control of the structures and properties of layered manganese oxychalcogenides

Topotactic oxidative and reductive control of the structures and properties of layered manganese oxychalcogenides
Topotactic oxidative and reductive control of the structures and properties of layered manganese oxychalcogenides
Topotactic modification, by both oxidation and reduction, of the composition, structures, and magnetic properties of the layered oxychalcogenides Sr(4)Mn(3)O(7.5)CU(2)Ch(2) (Ch = S, Se) is described. These Mn3+ compounds are composed of alternating perovskite-type strontium manganese oxide slabs separated by anti-fluorite-type copper chalcogenide layers and are intrinsically oxide deficient in the central layer of the perovskite slabs. The systems are unusual examples of perovskite-related compounds that may topotactically be both oxidized by fluorination and reduced by deintercalation of oxygen from the oxide-deficient part of the structure. The compounds exhibit antiferromagnetic ordering of the manganese magnetic moments in the outer layers of the perovskite slabs, while the other moments, in the central layers, exhibit spin-glass-like behavior. Fluorination has the effect of increasing the antiferromagnetic ordering temperature and the size of the ordered moment, whereas reduction destroys magnetic long-range order by introducing chemical disorder which leads to both further disorder and frustration of the magnetic interactions in the manganese oxide slab.
0002-7863
11192-11201
Hyett, Geoffrey
4f292fc9-2198-4b18-99b9-3c74e7dfed8d
Barrier, Nicolas
797b03aa-b5a7-44a9-8feb-d5755f15506f
Clarke, Simon J.
815edb0a-d89a-4770-8a11-3c23066b9b31
Hadermann, Joke
1268716b-563f-4a6b-9dbe-cc8149af5e7f
Hyett, Geoffrey
4f292fc9-2198-4b18-99b9-3c74e7dfed8d
Barrier, Nicolas
797b03aa-b5a7-44a9-8feb-d5755f15506f
Clarke, Simon J.
815edb0a-d89a-4770-8a11-3c23066b9b31
Hadermann, Joke
1268716b-563f-4a6b-9dbe-cc8149af5e7f

Hyett, Geoffrey, Barrier, Nicolas, Clarke, Simon J. and Hadermann, Joke (2007) Topotactic oxidative and reductive control of the structures and properties of layered manganese oxychalcogenides. Journal of the American Chemical Society, 129 (36), 11192-11201. (doi:10.1021/ja073048m).

Record type: Article

Abstract

Topotactic modification, by both oxidation and reduction, of the composition, structures, and magnetic properties of the layered oxychalcogenides Sr(4)Mn(3)O(7.5)CU(2)Ch(2) (Ch = S, Se) is described. These Mn3+ compounds are composed of alternating perovskite-type strontium manganese oxide slabs separated by anti-fluorite-type copper chalcogenide layers and are intrinsically oxide deficient in the central layer of the perovskite slabs. The systems are unusual examples of perovskite-related compounds that may topotactically be both oxidized by fluorination and reduced by deintercalation of oxygen from the oxide-deficient part of the structure. The compounds exhibit antiferromagnetic ordering of the manganese magnetic moments in the outer layers of the perovskite slabs, while the other moments, in the central layers, exhibit spin-glass-like behavior. Fluorination has the effect of increasing the antiferromagnetic ordering temperature and the size of the ordered moment, whereas reduction destroys magnetic long-range order by introducing chemical disorder which leads to both further disorder and frustration of the magnetic interactions in the manganese oxide slab.

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e-pub ahead of print date: 18 August 2007
Published date: 12 September 2007
Organisations: Organic Chemistry: Synthesis, Catalysis and Flow

Identifiers

Local EPrints ID: 347002
URI: http://eprints.soton.ac.uk/id/eprint/347002
ISSN: 0002-7863
PURE UUID: 1ac3a340-6bd2-4370-bfdc-ae3680528cc7
ORCID for Geoffrey Hyett: ORCID iD orcid.org/0000-0001-9302-9723

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Date deposited: 14 Feb 2013 16:51
Last modified: 15 Mar 2024 03:45

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Contributors

Author: Geoffrey Hyett ORCID iD
Author: Nicolas Barrier
Author: Simon J. Clarke
Author: Joke Hadermann

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