Pressure-induced disappearance of the local rhombohedral distortion in

J. P. Itié; B. Couzinet; A. Polian; A. M. Flank; P. Lagarde

doi:10.1209/epl/i2006-10020-2

All issues

Volume 74 / No 4 (May 2006)

Europhys. Lett., 74 4 (2006) 706-711

Abstract

Issue		Europhys. Lett. Volume 74, Number 4, May 2006


Page(s)		706 - 711
Section		Interdisciplinary physics and related areas of science and technology
DOI		https://doi.org/10.1209/epl/i2006-10020-2
Published online		14 April 2006

Europhys. Lett., 74 (4), pp. 706-711 (2006)

Pressure-induced disappearance of the local rhombohedral distortion in $\chem{BaTiO_{3}}$

J. P. Itié¹^,2, B. Couzinet¹, A. Polian¹, A. M. Flank² and P. Lagarde²

¹ Physique des Milieux Denses, IMPMC, CNRS UMR 7590, Université P. et M. Curie 140 Rue de Lourmel, 75015 Paris, France
² Synchrotron SOLEIL, CNRS UR1 - L'Orme des Merisiers St Aubin BP 48, 91192 Gif-sur-Yvette Cedex, France

Received: 27 January 2006
Accepted: 21 March 2006

Abstract

$\chem{BaTiO_{3}}$ has been studied by X-ray absorption spectroscopy at the Ti K edge up to $19\un{GPa}$ in a diamond anvil cell at room temperature. The pre-edge features observed at the Ti K edge are sensitive to the pressure. It is shown that the high-pressure cubic phase obtained above $2\un{GPa}$ is similar to the high-temperature one, with titanium out of the centre of the oxygen octahedron. Between 2 and $10\un{GPa}$ the intensity of the pre-edge features decreases indicating that the Ti atom is moving toward the centre of the oxygen octahedron. Above $10\un{GPa}$ , the features do not change anymore, showing that the Ti atom is at the centre of the oxygen octahedron. No correlation between the Ti atom position and the Raman activity under pressure is observed.

PACS: 81.40.Vw – Pressure treatment / 78.70.Dm – X-ray absorption spectra / 77.84.-s – Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.