SIMON, Quentin; DAUMONT, Christophe; PAYAN, Sandrine; GARDES, P.; POVEDA, Patrick; WOLFMAN, Jérôme; MAGLIONE, Mario

doi:10.1016/j.jallcom.2018.03.010

Métadonnées

Licence d’utilisation du document

SIMON, Quentin
GREMAN (matériaux, microélectronique, acoustique et nanotechnologies) [GREMAN]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

DAUMONT, Christophe
GREMAN (matériaux, microélectronique, acoustique et nanotechnologies) [GREMAN]

PAYAN, Sandrine
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

Langue

Article de revue

Ce document a été publié dans

Journal of Alloys and Compounds. 2018-05, vol. 747, p. 366-373

Elsevier

Résumé en anglais

The dielectric properties of Ba1-xCaxTi1-xZrxO3 (BCTZ) thin films are explored by varying x from 0 to 0.18 through an RF magnetron co-sputtering process. Thin films are analyzed by Rutherford Backscattering Spectroscopy, X-Ray Diffraction and dielectric measurements on parallel plate capacitors as a function of temperature (from 100 to 420 K), frequency (from 100 Hz to 1 MHz) and static electric field (from 0 to 250 kV cm−1). The evolutions of their dielectric properties with composition are systematically compared to bulk ceramic counterparts. In both cases, a continuous crossover from classical-to-relaxor ferroelectric behavior along with a decrease of the temperature of the permittivity maximum are observed as x increases. Besides, a phase convergence region (PCR) between cubic, tetragonal, orthorhombic and rhombohedral symmetries is evidenced for compositions close to x = 0.12. This is the first time that such a PCR is observed in thin films. At this point in the phase diagram, all of the dielectric parameters undergo specific variations. In particular, the enhanced permittivity dependence to external electric field for these Ca and Zr contents is attributed to an emerging relaxor behavior together with its vicinity of the PCR. These results make BCTZ thin films potential candidates to achieve electrically tunable devices.< Réduire

Mots clés en anglais

BCTZ

Thin film

Dielectric

Tunable capacitors

Sputtering

Lead-free relaxor

Métadonnées

Licence d’utilisation du document

Extreme dielectric non-linearities at the convergence point in Ba1-xCaxTi1-xZrxO3 thin films

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

DOI

Origine

Unités de recherche