Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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S.Alahraché, M.Deschamps, J.Lambert, M.R.Suchomel, D.De Sousa Meneses, G.Matzen, D.Massiot, E.Véron, M.Allix, 'Crystallization of Y2O3-Al2O3 rich glasses: synthesis of YAG glass-ceramics', J. Phys. Chem. C 115 20499–20506 (2011) doi:10.1021/jp207516w

An yttria-alumina glass incorporating 4 wt% of SiO2 was prepared by the use of an aerodynamic levitator equipped with a laser heating device. Upon post synthesis annealing, the glass is observed to exhibit crystallization below the glass transition temperature. In the current study, this unusual behaviour is examined using powder X-ray diffraction and infrared spectroscopy to follow crystallinity and optical absorbance as a function of annealing treatment. Double-resonance 7Al/29Si NMR spectroscopy and synchrotron diffraction experiments demonstrate that Si cations are incorporated in the formed Y3Al5O12(YAG) crystals on the 4-fold coordination Al site during crystallization. This has important consequences on the resulting microstructure of the YAG glass-ceramics.