First principles studies of SnTiO3 perovskite as a potential ferroelectric material.
BARAILLE, Isabelle
Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux [IPREM]
Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux [IPREM]
BARAILLE, Isabelle
Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux [IPREM]
< Réduire
Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux [IPREM]
Langue
en
Article de revue
Ce document a été publié dans
Chemical Physics. 2009, vol. 355, n° 1, p. 43-49
Elsevier
Résumé en anglais
In the context of the search for environment-respectful, Pb- and Bi- free chem. compds. for devices such as actuators, SnTiO3 (ST) is investigated from first principles within DFT. Full geometry optimization provides a ...Lire la suite >
In the context of the search for environment-respectful, Pb- and Bi- free chem. compds. for devices such as actuators, SnTiO3 (ST) is investigated from first principles within DFT. Full geometry optimization provides a stable tetragonal structure relative to cubic one. From the equation of state the equil. vol. of SnTiO3 is found smaller than ferroelec. PbTiO3 (PT) in agreement with a smaller Sn2+ radius. While ionic displacements exhibit similar trends between ST and PT a larger tetragonality (c/a ratio) for ST results in a larger polarization, PST = 1.1 C.m-2. The anal. of the electronic band structure detailing the Sn-O and Ti-O interactions points to a differentiated chem. bonding and a reinforcement of the covalent bonding with respect to Pb homolog< Réduire
Mots clés en anglais
tin titanate ferroelec crystallinity band structure simulation
Origine
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