Article (Scientific journals)
First-principles study of the ferroelectric Aurivillius phase Bi2WO6
Djani-Ait, Hania; Bousquet, Eric; Kellou, Abdelhafid et al.
2012In Physical Review. B, Condensed Matter and Materials Physics, 86, p. 054107
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Abstract :
[en] In order to better understand the reconstructive ferroelectric-paraelectric transition of Bi2WO6, which is unusual within the Aurivillius family of compounds, we performed first-principles calculations of the dielectric and dynamical properties of two possible high-temperature paraelectric structures—the monoclinic phase of A2/m symmetry observed experimentally and the tetragonal phase of I4/mmm symmetry—common to most Aurivillius-phase components. Both paraelectric structures exhibit various unstable modes, which, after their condensation, bring the system toward more stable structures of lower symmetry. The calculations confirm that, starting from the paraelectric A2/m phase at high temperatures, the system must undergo a reconstructive transition to reach the P21ab ferroelectric ground state.
Disciplines :
Physics
Author, co-author :
Djani-Ait, Hania ;  Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Bousquet, Eric  ;  Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Kellou, Abdelhafid
Ghosez, Philippe  ;  Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Language :
English
Title :
First-principles study of the ferroelectric Aurivillius phase Bi2WO6
Publication date :
August 2012
Journal title :
Physical Review. B, Condensed Matter and Materials Physics
ISSN :
1098-0121
eISSN :
1550-235X
Publisher :
American Physical Society, Woodbury, United States - New York
Volume :
86
Pages :
054107
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
Tier-1 supercomputer
CÉCI : Consortium des Équipements de Calcul Intensif
Available on ORBi :
since 22 August 2012

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