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Synthèse et caractérisation de nouveaux matériaux ferroélectriques accordables pour applications hyperfréquences

Abstract : Non-linear ferroelectric materials exhibiting low dielectric losses present an adjustable permittivity under electric field that can be turned to account in hyperfrequency agile components for microelectronic and telecom applications (tunable capacitors and resonators, phase shifters, ...). The required performances – low dielectric losses, moderate permittivity, maximum tunability, thermal stability up to hyperfrequencies – impose to improve the basic material Ba0.6Sr0.4TiO3 (BST). The ceramics prepared from BST and low loss nonferroelectric phase, like MgO, MgTiO3, but also new composites made of SnO2 and BaSnO3 are characterized by physico-chemical and electrical analysis. In order to decrease significantly the dielectric losses, new design - controlled composites (especially core/shell BST@SiO2) are developed through innovative soft chemistry processes. The feasibility study and their original dielectric properties lead the way to numerous possibilities of controlled phase arrangement in ferroelectric composites materials.
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https://tel.archives-ouvertes.fr/tel-00203599
Contributor : Stéphane Toulin <>
Submitted on : Thursday, January 10, 2008 - 3:39:13 PM
Last modification on : Thursday, January 11, 2018 - 6:15:06 AM
Long-term archiving on: : Tuesday, April 13, 2010 - 4:57:55 PM

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  • HAL Id : tel-00203599, version 1

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Christophe Huber. Synthèse et caractérisation de nouveaux matériaux ferroélectriques accordables pour applications hyperfréquences. Matériaux. Université Sciences et Technologies - Bordeaux I, 2003. Français. ⟨tel-00203599⟩

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