Article (Scientific journals)
Multianion induced out-of-plane proper polarization in oxyfluoride Aurivillius Bi2TiO4F2
Benomar, Sarah; Bousquet, Eric; Djani, Hania
2022In Journal of Physics and Chemistry of Solids, 167, p. 110720
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Keywords :
Condensed Matter Physics; General Materials Science; General Chemistry
Abstract :
[en] We explore the effect of anion ordering on the ferroelectric properties of the oxyfluoride Aurivillius Bi2TiO4F2 from first-principles calculations. We first identify the phonon instabilities in the high symmetry reference phases and build the energy diagram for the different low symmetry metastable phases coming from these instabilities. We found that the apical ordering of fluorine is more stable than the equatorial one but mixing apical and equatorial ordering together is even more favorable. For each fluorine ordering, the ground state is polar and exhibits a proper in-plane polarization. We also found that the apical ordering can exhibit a proper out-of plane polarization as large as 35 μc/cm2, which is unexpected in layered crystals. This finding opens the possibility to design polarization perpendicular to the stacking layers in ferroelectrics layered perovskites through multianion engineering, a property strongly desired for technological applications like FeRAM devices.
Disciplines :
Physics
Author, co-author :
Benomar, Sarah
Bousquet, Eric  ;  Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM)
Djani, Hania 
Language :
English
Title :
Multianion induced out-of-plane proper polarization in oxyfluoride Aurivillius Bi2TiO4F2
Publication date :
2022
Journal title :
Journal of Physics and Chemistry of Solids
ISSN :
0022-3697
Publisher :
Elsevier BV
Volume :
167
Pages :
110720
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
CÉCI : Consortium des Équipements de Calcul Intensif
Tier-1 supercomputer
Name of the research project :
FNRS CDR MULAN No. J.0020.20, CECI, Tier-1
Available on ORBi :
since 20 April 2022

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