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P-T studies of Pb(Zr1-xTix)O3 Ferroelectric Materials

Jerome Rouquette ,  Guillaume Fraysse ,  Ali Al-Zein ,  Veronique Bornand ,  Marie Pintard ,  Papet Philippe ,  Julien Haines 

Abstract

Due to their exceptional ferroelectric properties, PbZr1-xTixO3 (PZT) ceramics have been the subject of numerous studies. Dielectric susceptibility and piezoelectric properties are dependent on 3 variables: applied electric field, temperature and mechanical stress σij. In spite of the high sensitivity of the physical properties of PZT to hydrostatic pressure, its effect has been studied only recently. However, large stress fields can be observed in miniaturized components or in ferroelectric dots. In the literature, experiments and theoretical calculations have indicated the existence of an intrinsic short range dynamical disorder over nearly the entire PZT solid solution. In order to determine the phase transition sequence of this disordered material, we reported resonance Raman Spectroscopy of a self-trapped exciton emission oxygen deficient complex (TiTi’-VO··) was performed to probe titanium displacements as a function of the temperature1. Recently, note also for example that careful Rietveld refinements yield significantly better agreement factors using monoclinic models for the long-range structure of PbZr0.60Ti0.40O3, with a Cc space group at low temperature and with a Cm space group at high temperature, rather than the widely accepted rhombohedral symmetry2.

Based on neutron diffraction, X-ray diffraction, resonance Raman spectroscopy and X-Ray absorption Spectroscopy, we will present an overview of our new results on structure and dynamics of Pb(Zr1-xTix)O3 solid solution as a function of P and T3. These new important features have to be considered in the fundamental understanding of the ferroelectric-to-ferroelectric and ferroelectric-to-paraelectric phase transitions of such an important technological material.

1J. Rouquette, J. Haines, V. Bornand, M. Pintard, Ph. Papet, J.L. Sauvajol, Phys. Rev. B 73, 224118, (2006).

2G. Fraysse, J. Haines, V. Bornand, J. Rouquette, M. Pintard, Ph. Papet, S. Hull, , Phys. Rev. B 77, 064109 (2008).

3 (to be published).

 

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Presentation: Invited oral at E-MRS Fall Meeting 2008, Symposium C, by Jerome Rouquette
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-14 10:29
Revised:   2009-06-07 00:48