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Nouveaux tantalates ferroélectriques de type bronze quadratique de tungstène : de la structure aux propriétés physiques

Abstract : This work deals with the synthesis and the characterization of new ferroelectric materials with tetragonal tungsten bronze type structure containing lead and tantalum. By the way of theoretical calculations, a correlation between Curie temperature and chemical bonding was evidenced. Moreover, ceramics studied present others features such as a relaxor behavior and/or a high frequency relaxation and/or an ionic conductivity. With the assistance of experimental means (dielectric measurements over a wide range of both frequency and temperature, complex impedance spectroscopy measurements, X-ray diffraction analysis, structure determinations, Raman spectroscopy) and theoretical ones (EHTB and combinatorial calculations) relations between structure and physical properties were established. All results described constitute a contribution to the study of ferroelectric materials with TTB structure. They point out the wide range of parameters which can be modified to optimize a composition for a specific application.
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https://tel.archives-ouvertes.fr/tel-00003498
Contributor : Stéphane Toulin <>
Submitted on : Tuesday, October 7, 2003 - 6:36:21 PM
Last modification on : Thursday, January 11, 2018 - 6:15:07 AM
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  • HAL Id : tel-00003498, version 1

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Virginie Hornebecq. Nouveaux tantalates ferroélectriques de type bronze quadratique de tungstène : de la structure aux propriétés physiques. Autre. Université Sciences et Technologies - Bordeaux I, 2000. Français. ⟨tel-00003498⟩

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