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Magnetic interactions in cubic-, hexagonal- and trigonal-barium iron oxide fluoride, BaFeO2F

Clemens, Oliver and Marco, José F. and Thomas, Michael F. and Forder, Susan D. and Zhang, Hongbin and Cartenet, Simon and Monze, Anais and Bingham, Paul A. and Slater, Peter R. and Berry, Frank J. (2016):
Magnetic interactions in cubic-, hexagonal- and trigonal-barium iron oxide fluoride, BaFeO2F.
In: Journal of Physics: Condensed Matter, IOP Publishing Ltd., p. 346001, 28, (34), ISSN 0953-8984,
DOI: 10.1088/0953-8984/28/34/346001,
[Online-Edition: https://doi.org/10.1088/0953-8984/28/34/346001],
[Article]

Abstract

Fe-57 Mossbauer spectra have been recorded from the hexagonal (6H)- and trigonal (15R) -modifications of BaFeO2F and are compared with those previously recorded from the cubic form of BaFeO2F. The spectra, recorded over a temperature range from 15 to 650 K show that all of the iron in all the compounds is in the Fe3+ state. Spectra from the 6H- and 15R-modifications were successfully fitted with components that were related to the Fe(1) and Fe(2) structural sites in the 6H variant and to the Fe(1), Fe(2) and Fe(3) structural sites in the 15R form. The magnetic ordering temperatures were determined as 597 +/- 3 K for 6H-BaFeO2F and 636 +/- 3 K for 15R-BaFeO2F. These values are surprisingly close to the value of 645 +/- 5 K determined for the cubic form. The magnetic interactions in the three forms are compared with a view to explaining this similarity of magnetic ordering temperature.

Item Type: Article
Erschienen: 2016
Creators: Clemens, Oliver and Marco, José F. and Thomas, Michael F. and Forder, Susan D. and Zhang, Hongbin and Cartenet, Simon and Monze, Anais and Bingham, Paul A. and Slater, Peter R. and Berry, Frank J.
Title: Magnetic interactions in cubic-, hexagonal- and trigonal-barium iron oxide fluoride, BaFeO2F
Language: English
Abstract:

Fe-57 Mossbauer spectra have been recorded from the hexagonal (6H)- and trigonal (15R) -modifications of BaFeO2F and are compared with those previously recorded from the cubic form of BaFeO2F. The spectra, recorded over a temperature range from 15 to 650 K show that all of the iron in all the compounds is in the Fe3+ state. Spectra from the 6H- and 15R-modifications were successfully fitted with components that were related to the Fe(1) and Fe(2) structural sites in the 6H variant and to the Fe(1), Fe(2) and Fe(3) structural sites in the 15R form. The magnetic ordering temperatures were determined as 597 +/- 3 K for 6H-BaFeO2F and 636 +/- 3 K for 15R-BaFeO2F. These values are surprisingly close to the value of 645 +/- 5 K determined for the cubic form. The magnetic interactions in the three forms are compared with a view to explaining this similarity of magnetic ordering temperature.

Journal or Publication Title: Journal of Physics: Condensed Matter
Volume: 28
Number: 34
Publisher: IOP Publishing Ltd.
Uncontrolled Keywords: Mossbauer spectra, magnetic ordering temperature, superexchange
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Materialdesign durch Synthese
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science > Theory of Magnetic Materials
Date Deposited: 23 Mar 2017 09:58
DOI: 10.1088/0953-8984/28/34/346001
Official URL: https://doi.org/10.1088/0953-8984/28/34/346001
Funders: Oliver Clemens thanks the German Academic Exchange Service (DAAD) for being given a Postdoctoral Research Fellowship and the German Research Foundation for providing an Emmy Noether Research Fellowship (Grant No. CL 551/2-1)., We acknowledge financial support from Spanish MINECO (Project MAT2015-64110-C2-1-P).
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