Crystal chemical and dielectric properties of Pb$_{0.5(5\mbox{-}x)}$ La$_x$ Nb$_{5\mbox{-}x}$ Fe$_x$ O$_{15}$ system with “tetragonal tungsten bronze” structural type

M. Bouziane; A. Benabad; J.-C. Niepce; B. Elouadi

doi:doi:10.1051/jp4:2005123030

Issue		J. Phys. IV France Volume 123, March 2005


Page(s)		177 - 182
DOI		https://doi.org/10.1051/jp4:2005123030

J. Phys. IV France 123 (2005) 177-182
DOI: 10.1051/jp4:2005123030

Crystal chemical and dielectric properties of Pb $_{0.5(5\mbox{-}x)}$ La_x Nb $_{5\mbox{-}x}$ Fe_x O₁₅ system with "tetragonal tungsten bronze" structural type

M. Bouziane¹, A. Benabad¹, J.-C. Niepce² and B. Elouadi³

¹ Laboratoire de Chimie du Solide Appliquée, Laboratoire Associé Francophone No. 501, Faculté des Sciences, Avenue Ibn Batouta, BP. 1014, Rabat, Maroc
² Laboratoire de Recherches sur la Réactivité des Solides, UMR 5613 CNRS, Université de Bourgogne, BP. 47870, 21078 Dijon Cedex, France
³ Laboratoire d'Élaboration, d'Analyse Chimique et d'Ingénierie des Matériaux, Département de Chimie, Université de la Rochelle, Avenue Michel Crépeau, 17042 La Rochelle Cedex 01, France

Abstract
The lanthanum-lead and iron-niobium coupled substitution in PbNb₂O₆ have allowed to isolate new materials of a general formula Pb $_{0.5(5-{\rm x})}$ La $_{\rm x}$ Nb $_{5-{\rm x}}$ Fe $_{\rm x}$ O₁₅ crystallising with the "tetragonal tungsten bronze" structural type. The resulting influence on the lattice parameters, the ferroelectric Curie temperature and Cole - Cole plots are presented. A typical ferroelectric - paraelectric behaviour occurs in the composition range 0 $\le$ x $\le$ 0.33 while, a relaxor behaviour is observed in the composition range 0.33 < x $\le$ 1.

Crystal chemical and dielectric properties of Pb Lax Nb Fex O15 system with "tetragonal tungsten bronze" structural type

Crystal chemical and dielectric properties of Pb $_{0.5(5\mbox{-}x)}$ La_x Nb $_{5\mbox{-}x}$ Fe_x O₁₅ system with "tetragonal tungsten bronze" structural type