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Bi2CoO2F4 – a polar, ferrimagnetic Aurivillius oxide-fluoride

Scott, Euan A.S.; Mitoudi Vagourdei, Eleni; Johnsson, Mats; Cascos, Vanessa; John, Filbin; Pickup, Dave; Chadwick, Alan V.; Djani, Hania; Bousquet, Eric; Zhang, Weiguo; Halasyamani, P. Shiv; McCabe, Emma

Bi2CoO2F4 – a polar, ferrimagnetic Aurivillius oxide-fluoride Thumbnail


Euan A.S. Scott

Eleni Mitoudi Vagourdei

Mats Johnsson

Vanessa Cascos

Filbin John

Dave Pickup

Alan V. Chadwick

Hania Djani

Eric Bousquet

Weiguo Zhang

P. Shiv Halasyamani


Aurivillius oxides have been a research focus due to their ferroelectric properties, but by replacing oxide ions by fluoride, divalent magnetic cations can be introduced, giving Bi2MO2F4 (M = Fe, Co, and Ni). Our combined experimental and computational study on Bi2CoO2F4 indicates a low-temperature polar structure of P21ab symmetry (analogous to ferroelectric Bi2WO6) and a ferrimagnetic ground state. These results highlight the potential of Aurivillius oxide-fluorides for multiferroic properties. Our research has also revealed some challenges associated with the reduced tendency for polar displacements in the more ionic fluoride-based systems.


Scott, E. A., Mitoudi Vagourdei, E., Johnsson, M., Cascos, V., John, F., Pickup, D., …McCabe, E. (2022). Bi2CoO2F4 – a polar, ferrimagnetic Aurivillius oxide-fluoride. Chemistry of Materials, 34(21), 9775-9785.

Journal Article Type Article
Acceptance Date Oct 3, 2022
Publication Date 2022
Deposit Date Oct 6, 2022
Publicly Available Date Nov 21, 2022
Journal Chemistry of Materials
Print ISSN 0897-4756
Electronic ISSN 1520-5002
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 34
Issue 21
Pages 9775-9785


Published Journal Article (8 Mb)

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