HAL : hal-00433535, version 1

DOI : 10.1088/0953-8984/21/45/452201

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Journal of Physics Condensed Matter / JOURNAL OF PHYSICS-CONDENSED MATTER 21, 45 (2009) 452201 (5 p.)

Flexible relaxor materials: Ba2PrxNd1−xFeNb4O15 tetragonal tungsten bronze solid solution

Elias Castel 1, Michaël Josse 1, Dominique Michau 1, Mario Maglione 1

(2009)

Relaxors are very interesting materials but most of the time they are restricted to perovskite materials and thus their flexibility is limited. We have previously shown that tetragonal tungsten bronze (TTB) niobate Ba2PrFeNb4O15 was a relaxor below 170 K and that Ba2NdFeNb4O15 displays a ferroelectric behavior with a TC = 323 K. On scanning the whole solid solution Ba2PrxNd1−xFeNb4O15 (x = 0, 0.2, 0.4, 0.5, 0.6, 0.8 and 1), we demonstrate here a continuous crossover between these end member behaviors with a coexistence of ferroelectricity and relaxor in the intermediate range. This tunability is ascribed to the peculiar structure of the TTB networks which is more open than the classical perovskites. This allows for the coexistence of long range and short range orders and thus opens up the range of relaxor materials.

1 :	Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB)
	CNRS : UPR9048 – Université de Bordeaux – Ecole Nationale Supérieure de Chimie, de Biologie et de Physique

Domaine

:

Chimie/Matériaux

Mots Clés : Tetragonal tungsten bronze – Solid solution – Relaxors – Flexible materials

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Contributeur : Stéphane Toulin <>

Soumis le : Jeudi 19 Novembre 2009, 18:19:04

Dernière modification le : Jeudi 19 Novembre 2009, 21:17:47