Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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H.Benchorfi, S.Chenu, J.-R.Duclère, C.Genevois, M.Allix, E.Véron, J.Cornette, Maggy Colas, V.A.G.Rivera, V.Fuertes, F.Brisset, P.Carles, S.Aouji, P.Thomas, Y.Messaddeq, G.Delaizir, 'Crystallization in the TeO2 - Ta2O5 - Bi2O3 system: From glass to anti-glass to transparent ceramic', J. Eur. Ceram. Soc. 44 1131-1142 (2024) doi:10.1016/j.jeurceramsoc.2023.09.045

Glass samples belonging the TeO2 - Ta2O5 - Bi2O3 (TTB) system are prepared by conventional melt-quenching technique and the corresponding vitreous domain is identified. A crystallization study of the 80 TeO2 - 10 Ta2O5 - 10 Bi2O3 glass composition versus temperature shows structural transitions from glass to the stabilization of an unreported translucent anti-glass phase and eventually to a fully transparent crystalline ceramic in both the visible and infrared ranges. The structure and microstructure of the anti-glass and ceramic phases are characterized by Powder X-Ray Diffraction, Electron Back-Scatter Diffraction, Transmission Electron Microscopy and Raman spectroscopy. The optical properties of undoped and Er3+-doped transparent samples are also discussed. Up-conversion green emission band shows that the glass intensity is about 2 and 4 times more intense than that of the anti-glass and the ceramic, respectively. Furthermore, a large spectral bandwidth of 105 nm is found in the anti-glass sample. The advantageous spectroscopic characteristics found here, together with the good thermal stability of these samples, suggest that the anti-glass phase has potential applications as amplification medium for the generation of ultrashort (femtoseconds) pulses.