Article (Scientific journals)
Interplay between Ca- A nd Ti-driven ferroelectric distortions in (Ba, Ca)TiO3 solid solutions from first-principles calculations
Amoroso, Danila; Cano, A.; Ghosez, Philippe
2019In Applied Physics Letters, 114, p. 092902
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Keywords :
Barium; Barium compounds; Calculations; Ferroelectricity; Perovskite; Titanium oxides; Ferroelectric distortion; First-principles calculation; Lead-free piezoelectrics; Partial substitution; Piezoelectric response; Quasi-isotropic; Small concentration; Steric effect; Solid solutions
Abstract :
[en] (Ba,Ca)(Ti,Zr)O3 solid solutions are promising lead-free piezoelectrics near their polymorphic phase boundary, which is believed to be linked to the interplay between B-site driven ferroelectricity and A-site driven ferroelectricity. Focusing on (Ba,Ca)TiO3, we support this picture from first-principles calculations. In particular, we show how steric effects related to the partial substitution of Ba by Ca largely enhance the Ca-driven ferroelectricity, already virtually allowed in the parent CaTiO3. The emergent interplay between the Ca-driven and Ti-driven mechanisms lowers the energy barrier between different polar states, which eventually results in a quasi-isotropic polarization under substitution of a small concentration of Ba by Ca. A sizeable enhancement of the piezoelectric response directly results from these features. © 2019 Author(s).
Disciplines :
Physics
Author, co-author :
Amoroso, Danila ;  Université de Liège - ULiège > Département de physique > Physique des matériaux et nanostructures
Cano, A.;  ICMCB, CNRS, Université de Bordeaux, Pessac, F-33600, France
Ghosez, Philippe  ;  Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Language :
English
Title :
Interplay between Ca- A nd Ti-driven ferroelectric distortions in (Ba, Ca)TiO3 solid solutions from first-principles calculations
Publication date :
2019
Journal title :
Applied Physics Letters
ISSN :
0003-6951
eISSN :
1077-3118
Publisher :
American Institute of Physics Inc.
Volume :
114
Pages :
092902
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
CÉCI : Consortium des Équipements de Calcul Intensif
Tier-1 supercomputer
Funders :
FWB - Fédération Wallonie-Bruxelles [BE]
[BE]
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since 02 July 2019

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