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Développement et caractérisation de céramiques spinelles transparentes ZnGa2O4

Abstract : For a few years, transparent ceramics were widely studied due to their optical properties and applications in photonic (high power laser, …). Owing to their polycrystalline structure, their mechanical properties are increased, allowing to expend the prospective applications to the military field (radome, window, …). Compared to monocrystalline materials from which they mimic the properties, their synthesis route is easier, less time-depending and less expensive. Today, various types of transparent ceramics, such as alumina (Al2O3), Yttrium Aluminum Garnet or magnesium aluminum spinel (MgAl2O4), were synthetized by pressured sintering (Spark Plasma Sintering, Hot Isostatic Pressing or Hot Pressing). MgAl2O4 is crystallized under a cubic spinel structure and its composition induces a wide transparency range for the material (from 0.25 to 9 μm). Other spinel structure compounds, such as ZnAl2O4, are also studied. During this thesis, we have concentrated on the Spark Plasma Sintering synthesis of new zing gallate spinel (ZnGa2O4) transparent ceramics. To do so, three different routes were investigated: pseudo-reactive sintering of a ZnO-Ga2O3 mixture, densification a preformed ZnGa2O4 phase and consolidation of ZnGa2O4 nanocrystals obtained through a glass-ceramic lixiviation. The feasibilities of their synthesis were proved and both Cr3+:ZnGa2O4 et Ni2+:ZnGa2O4 ceramics were obtained by pseudo-reactive sintering and their optical properties were studied.
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Submitted on : Wednesday, February 23, 2022 - 11:40:10 AM
Last modification on : Saturday, March 26, 2022 - 4:28:30 AM


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  • HAL Id : tel-03585552, version 2



Claire Mevel. Développement et caractérisation de céramiques spinelles transparentes ZnGa2O4. Matériaux. Université de Limoges, 2021. Français. ⟨NNT : 2021LIMO0108⟩. ⟨tel-03585552v2⟩



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