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Updated: Aug 20, 2025

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Published on: October 27, 2018
Bi2CoO2F4-A Polar, Ferrimagnetic Aurivillius Oxide-Fluoride
Euan A S Scott1, Eleni Mitoudi Vagourdi2, Mats Johnsson2
1School of Physical Sciences, University of Kent, Kent, Canterbury CT2 7NH, U.K.
Abstract:
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 Bi2 MO2F4 (M = Fe, Co, and Ni). Our combined experimental and computational study on Bi2CoO2F4 indicates a low-temperature polar structure of P21 ab 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.
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