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Synthèses par voies solide et hydrothermale pour céramiques de type BNT - BT - BKT

Abstract : This study focuses on the study of one of the most promising systems as an alternative to PZT, the Bi0,5Na0,5TiO3 - BaTiO3 - Bi0,5K0,5TiO3 ternary system. The first part of the thesis consists on the solid state synthesis of this system and has allowed a more accurate estimation of the morphotropic phase boundary location. In a second part, we focused this study on the development of BNT powders hydrothermal synthesis. Although various protocols have developed the production of fine and single phased powders, all of them are characterized by the presence of thermally unstable phases in minor quantities but nevertheless sufficient to let appear a strong porosity after sintering. Various washing techniques have been developed to eliminate these metastable phases. A compromise between the quality of the metastable phase elimination and the preservation of the major phase chemical composition must be realized. The densification ratio and piezoelectric properties obtained for these ceramics are widely comparable to the solid route synthesized ones. The BNT - BT cosynthesis study of the 0,935 BNT - 0,065 BT binary composition put in evidence the prerequisite and definitive bismuth titanate Bi12TiO20 precipitation.
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Submitted on : Tuesday, November 17, 2020 - 11:38:09 AM
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Jean-François Trelcat. Synthèses par voies solide et hydrothermale pour céramiques de type BNT - BT - BKT. Sciences de l'ingénieur [physics]. Université de Valenciennes et du Hainaut-Cambrésis, 2010. Français. ⟨NNT : 2010VALE0029⟩. ⟨tel-03009476⟩

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