SOL-GEL PROCESSING AND DIELECTRIC PROPERTIES

0F (Pb1-yLay)(Zr0.52Ti0.48)O3 CERAMICS

K. Bouayad1, S. Sayouri1*, M. Ezzejjari1,2, L. Hajji3,

A. Alimoussa3, M. Filali1,4, P. Dieudonné4, J. Tajmouati5

1Laboratoire de Physique Théorique et Appliquée, Département de Physique, Faculté des Sciences-DM, B.P. 1796, Fès-Atlas, Maroc

.2Département de Physique, EST, Route d’Immouzer, Fès, Maroc

3LESEO Département de Physique, FST Guéliz Marrakech, Maroc

4GDPC, cc 026 Place Eugène Bataillon, 34095 Montpellier Cedex 05, France

5Département de Physique, Faculté des Sciences-DM, B.P. 1796, Fès-Atlas, Maroc

* Corresponding author. E-mail: ssayouri@yahoo.com

Received :10 January 2005; revised version accepted :03 June 2005

Abstract

(Pb1-yLay)(Zr0.52Ti0.48)O3 (PLZTy) powders were prepared using sol gel process and their structural and dielectric properties investigated. The effect of addition of La has been studied and increasing La content is shown to transform the average symmetry to tetragonal one in the calcined samples and to lower the temperature of the maximum of the dielectric permittivity (er). An anomaly, located at about 180°C, is observed on er, on the samples with y=0 and y=0.05; this anomaly was interpreted as a transition from ferroelectric-rhombohedral phase to ferroelectric-quadratic phase.

Keywords: PLZT; Dielectric anomalies; MPB; Relaxation.

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