LAULHÉ, Claire; HIPPERT, Francoise; KREISEL, Jens; MAGLIONE, Mario; SIMON, Annie; HAZEMAN, Jean-Louis; NASSIF, Vivian

doi:10.1103/PhysRevB.74.014106

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

LAULHÉ, Claire
Laboratoire des matériaux et du génie physique [LMGP ]

HIPPERT, Francoise
Laboratoire des matériaux et du génie physique [LMGP ]

KREISEL, Jens
Laboratoire des matériaux et du génie physique [LMGP ]

Langue

Article de revue

Ce document a été publié dans

Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2006, vol. 74, n° 1, p. 014106

American Physical Society

Résumé en anglais

Extended X-ray absorption fine structure (EXAFS) experiments at the Zr K-edge were carried out on perovskite relaxor ferroelectrics BaTi(1-x)Zr(x)O3 (BTZ) (x = 0.25, 0.30, 0.35), and on BaZrO3 for comparison. Structural information up to 4.5 A around the Zr atoms is obtained, revealing that the local structure differs notably from the average Pm-3m cubic structure deduced from X-ray diffraction. In particular, our results show that the distance between Zr atoms and their first oxygen neighbors is independent of the Zr substitution rate x and equal to that measured in BaZrO3, while the X-ray cubic cell parameter increases linearly with x. Furthermore, we show that the Zr atoms tend to segregate in Zr-rich regions. We propose that the relaxor behavior in BTZ is linked to random elastic fields generated by this particular chemical arrangement, rather than to random electric fields as is the case in most relaxors.< Réduire

Mots clés en anglais

X-ray absorption spectroscopy

EXAFS

Barium zirconate titanate

BZT

Ferroelectricity and antiferroelectricity

Niobates

titanates

tantalates

PZT ceramics

Métadonnées

Licence d’utilisation du document

EXAFS study of lead-free relaxor ferroelectric BaTi(1-x)Zr(x)O3 at the Zr K-edge

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

DOI

Origine

Unités de recherche