Synthesis and multi-scale characterization

of high performance F-Doped PZT

 

L. Lebrun*, L. Eyraud, B. Guiffard, S. Pruvost, G. Sébald, D. Guyomar

Laboratoire de Génie Electrique et Ferroélectricité, LGEF,  INSA-Lyon, Bâtiment Gustave Ferrié,

8 rue de la Physique, Villeurbanne Cedex,F-69621, France

* Corresponding author. E-mail: laurent.lebrun@insa-lyon.fr

Received: 08 January 2007; revised version accepted:16 February 2007

 

Abstract

     Acceptor-F co doped PZT have been prepared using an oxalates –hydroxides route. These materials present outstanding non hysteric and almost temperature and stress independent macroscopic properties. This behaviour can be explained by the defect dipole concept except for (Mn, F) co-doped ceramics. A tentative of explanation based on charge transfer between chemical defect, acceptor and donor sites is given. This concept seems to be valid for all doped and undoped MPB compositons leading to a new and general definition of hard and soft PZT. In order to better understand the mechanisms which rule the properties, multi-scale characterization has been performed using DRX measurement. The very first results confirm the strong dependence of macroscopic coefficient versus 90° stress induced domain switching for both PMN-PT and PZT systems. In the case of PMN-PT, measurements versus temperature tend to prove that the coefficient dependence has not an extrinsic origin as for stress but an intrinsic one (temperature induced intrinsic dipolar moment of the lattice). To a certain extend, this observation could explain why coefficient behaviours versus stress or versus temperature can be so different.


 

Keywords: Ferroelectricity; Piezoelectricity; Multiscale characterization; Domain switching.

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