ALBINO, Marjorie; HEIJBOER, Pierre; PORCHER, Florence; DECOURT, Rodolphe; VEBER, Philippe; MAGLIONE, Mario; JOSSE, Michaël

doi:10.1039/C7TC04742H

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

ALBINO, Marjorie
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

HEIJBOER, Pierre
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

PORCHER, Florence
Laboratoire Léon Brillouin [LLB - UMR 12]

Langue

Article de revue

Ce document a été publié dans

Journal of Materials Chemistry C. 2018, vol. 6, n° 6, p. 1521-1534

Royal Society of Chemistry

Résumé en anglais

In the framework of the crystal chemical investigation of Tetragonal Tungsten Bronze (TTB) niobates, the Ba2NdFeNb4−xTaxO15 solid solution has been investigated in order to gain insights on the relaxor to ferroelectric crossover and its features. Single-phase ceramics were synthesised by conventional two-step firing and sintering and they underwent extended chemical, structural, microstructural and physical characterizations. For Nb-rich compositions (x ≤ 0.5), the temperature dependence of the dielectric permittivity, the pyroelectric coefficient, and also the ferroelectric hysteresis loops revealed a nonconventional relaxor to ferroelectric crossover, which was confirmed by piezoelectric measurements for x ≤ 0.1. A thermal hysteresis of the ferroelectric transition revealed the existence of a metastable ferroelectric phase in these TTB niobates. An accurate and reliable dielectric phase diagram is established from these observations, which allows discussing the original sequence of dielectric phase transitions encountered in this solid solution.< Réduire

DOI

http://dx.doi.org/10.1039/C7TC04742H

Project ANR

Croissance Cristalline d'Oxydes Dielectriques - ANR-09-JCJC-0079

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026