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Evolution des propriétés diélectriques, ferroélectriques et électromécaniques dans le système pseudo-binaire (1-x)BaTi0.8Zr0.2O3- xBa0.7Ca0.3TiO3 / Corrélations structures et propriétés

Abstract : The aim of this work is to make a full characterization of the structural, microstructural, dielectric,ferroelectric and piezoelectric properties of the perovskite-structured oxides (1-x) BaTi0.8Zr0.2O3-xBa0.7Ca0.3TiO3 prepared by a conventional solid-state reaction method (conventional sintering) andSPS fabrication technique. Using high-resolution synchrotron x-ray powder diffraction, the structuralinvestigations carried out close to the triple point (x≈ 0.32) have introduced significant corrections tothe previously published composition-temperature phase diagram. The colossal electromechanicalresponse was then correlated to a strongly degenerate free energy landscape caused by structuralinstabilities. Furthermore, the coupling between the high polarization flexibility under electric andthermal stresses and the ‘lattice softening’ gives rise to a giant electromechanical response due tohigh domain wall activities. The decrease of the dielectric, ferroelectric and piezoelectric propertiesof BCTZ ceramics (x=0.32 and 0.5) processed by SPS was essentially attributed to the largecompositional fluctuations and stable domain wall configurations as the grain size decreased.
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Submitted on : Saturday, November 2, 2013 - 1:04:35 AM
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Feres Benabdallah. Evolution des propriétés diélectriques, ferroélectriques et électromécaniques dans le système pseudo-binaire (1-x)BaTi0.8Zr0.2O3- xBa0.7Ca0.3TiO3 / Corrélations structures et propriétés. Matériaux. Université Sciences et Technologies - Bordeaux I, 2013. Français. ⟨NNT : 2013BOR14782⟩. ⟨tel-00879222⟩

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