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Introducing a Large Polar Tetragonal Distortion into Ba-Doped BiFeO3by Low-Temperature Fluorination

Clemens, Oliver and Kruk, Robert and Patterson, Eric A. and Loho, Christoph and Reitz, Christian and Wright, Adrian J. and Knight, Kevin S. and Hahn, Horst and Slater, Peter R. (2014):
Introducing a Large Polar Tetragonal Distortion into Ba-Doped BiFeO3by Low-Temperature Fluorination.
In: Inorganic Chemistry, ACS Publications, pp. 12572-12583, 53, (23), ISSN 0020-1669, [Online-Edition: http://dx.doi.org/10.1021/ic502183t],
[Article]

Abstract

This article reports on the synthesis and crystallographic and magnetic structure of barium-doped BiFeO3 compounds with approximate composition Bi(1-x)BaxFeO(3-x/2), as well as those of the fluorinated compounds Bi(1-x)BaxFeO(3-x)F(x) (both with x = 0.2, 0.3), prepared by low-temperature fluorination of the oxide precursors using polyvinylidenedifluoride. Whereas the oxide compounds were obtained as cubic (x = 0.2) and slightly tetragonal (x = 0.3, c/a approximate to 1.003) distorted perovskite compounds, a large tetragonal polar distortion was observed for the oxyfluoride compounds (c/a approximate to 1.08 for x = 0.2 and similar to 1.05 for x = 0.3), being isostructural to tetragonal PbTiO3. Although described differently in previous reports on Ba-doped BiFeO3, the observed remanent magnetization is found to agree well with the amount of BaFe12O19 only detectable by neutron diffraction and the well-known magnetic properties of BaFe12O19. The oxyfluoride compounds show G-type antiferromagnetic ordering with magnetic moments lying in the a/b plane.

Item Type: Article
Erschienen: 2014
Creators: Clemens, Oliver and Kruk, Robert and Patterson, Eric A. and Loho, Christoph and Reitz, Christian and Wright, Adrian J. and Knight, Kevin S. and Hahn, Horst and Slater, Peter R.
Title: Introducing a Large Polar Tetragonal Distortion into Ba-Doped BiFeO3by Low-Temperature Fluorination
Language: English
Abstract:

This article reports on the synthesis and crystallographic and magnetic structure of barium-doped BiFeO3 compounds with approximate composition Bi(1-x)BaxFeO(3-x/2), as well as those of the fluorinated compounds Bi(1-x)BaxFeO(3-x)F(x) (both with x = 0.2, 0.3), prepared by low-temperature fluorination of the oxide precursors using polyvinylidenedifluoride. Whereas the oxide compounds were obtained as cubic (x = 0.2) and slightly tetragonal (x = 0.3, c/a approximate to 1.003) distorted perovskite compounds, a large tetragonal polar distortion was observed for the oxyfluoride compounds (c/a approximate to 1.08 for x = 0.2 and similar to 1.05 for x = 0.3), being isostructural to tetragonal PbTiO3. Although described differently in previous reports on Ba-doped BiFeO3, the observed remanent magnetization is found to agree well with the amount of BaFe12O19 only detectable by neutron diffraction and the well-known magnetic properties of BaFe12O19. The oxyfluoride compounds show G-type antiferromagnetic ordering with magnetic moments lying in the a/b plane.

Journal or Publication Title: Inorganic Chemistry
Volume: 53
Number: 23
Publisher: ACS Publications
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 > Nonmetallic-Inorganic Materials
Date Deposited: 16 Feb 2015 13:14
Official URL: http://dx.doi.org/10.1021/ic502183t
Identification Number: doi:10.1021/ic502183t
Funders: H.H. appreciates the support of the State of Hesse by an equipment grant.
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