Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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C.Mével, J.Carreaud, C.Caillaud, F.Bour, G.Delaizir, V.Castaing, B.Viana, P.Carles, F.Brisset, .Genevois, M.Allix, S.Chenu, 'Sintering of lixiviated nano glass-ceramics: An original route to elaborate transparent ceramics', J. Eur. Ceram. Soc. 44 393 (2024) doi:10.1016/j.jeurceramsoc.2023.09.004

We report the elaboration of translucent ZnGa2O4 ceramics by an innovative process, the sintering by Spark Plasma Sintering (SPS) of spinel ceramic powder obtained by the lixiviation of glass-ceramics. Indeed, a selective dissolution of the silica-rich glass matrix allows isolating ZnGa2O4 nanocrystals embedded in the silicate glass-ceramic. This glass-ceramic is elaborated from the parent glass of composition 55 SiO2 - 5 Na2O - 17 ZnO - 23 Ga2O3 (%mol) that undergoes a subsequent heat-treatment at 1100 °C under air leading to the crystallization of zinc gallate spinel nanocrystals with size in the 20–60 nm range. Lixiviated nanocrystals are collected and sintered by SPS to get a bulk ceramic. While the transmittance of this ceramic is only 60% at 4.5 µm, which is lower than the theoretical transmittance (82.5%), these first results are still promising and pave the way to new transparent ceramic processing route. Indeed, glass crystallization combined with selective lixiviation process is a powerful, non-conventional elaboration process that can further allow the stabilization and isolation of metastable crystalline phases with interesting functional properties.