Article (Scientific journals)
First-principles study of (Ba,Ca)TiO3 and Ba(Ti,Zr) O3 solid solutions
Amoroso, Danila; Cano, Andres; Ghosez, Philippe
2018In Physical Review. B, 97, p. 174108
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Abstract :
[en] (Ba,Ca)TiO3 and Ba(Ti,Zr)O3 solid solutions are the building blocks of lead-free piezoelectric materials that attract a renewed interest. We investigate the properties of these systems by means of first-principles calculations, with a focus on the lattice dynamics and the competition between different ferroelectric phases. We first analyze the four parent compounds in order to compare their properties and their different tendency towards ferroelectricity. The core of our study is systematic characterization of the binary systems (Ba,Ca)TiO3 and Ba(Ti,Zr)O3 within both the virtual crystal approximation and direct supercell calculations. In the case of Ca doping, we find a gradual transformation from B-site to A-site ferroelectricity due to steric effects that largely determines the behavior of the system. In the case of Zr doping, in contrast, the behavior is eventually dominated by cooperative Zr-Ti motions and the local electrostatics. In addition, our comparative study reveals that the specific microscopic physics of these solids sets severe limits to the applicability of the virtual crystal approximation for these systems. © 2018 American Physical Society.
Research center :
CESAM - Complex and Entangled Systems from Atoms to Materials - ULiège
Disciplines :
Physics
Author, co-author :
Amoroso, Danila ;  Université de Liège - ULiège > Département de physique > Physique des matériaux et nanostructures
Cano, Andres;  ICMCB, CNRS, Université de Bordeaux, UMR 5026, Pessac, France
Ghosez, Philippe  ;  Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Language :
English
Title :
First-principles study of (Ba,Ca)TiO3 and Ba(Ti,Zr) O3 solid solutions
Publication date :
2018
Journal title :
Physical Review. B
ISSN :
2469-9950
eISSN :
2469-9969
Publisher :
American Physical Society
Volume :
97
Pages :
174108
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
Tier-1 supercomputer
CÉCI : Consortium des Équipements de Calcul Intensif
European Projects :
H2020 - 641640 - EJD-FunMat - European Joint Doctorate in Functional Materials Research
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
CE - Commission Européenne [BE]
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