Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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M.Licheron, V.Montouillout, F.Millot, D.R.Neuville, 'Raman and 27Al NMR structure investigations of aluminate glasses : (1-x)Al2O3- x MO, with M=Ca, Sr, Ba and 0.5, J. Non-Cryst. Solids 357 2796–2801 (2011) doi:10.1016/j.jnoncrysol.2011.03.001

Aluminate glasses are important materials from a fundamental structural point of view because Al is the only network former. They present also a technological interest because of their good IR transmission and ultralow optical losses. Aluminum in glasses of the system MO-Al2O3 (M=Ca, Sr, Ba) can have different coordination numbers, essentially 4 and 6, as a function of the MO/Al2O3 ratio. Using Raman spectroscopy and high field 27Al NMR spectroscopy, we have determined the structure of aluminum network as a function of MO/Al2O3 ratio with M corresponds to different alkaline-earth cations. Al is essentially in four-fold coordination with different amounts for Al2O3 between 50 and 75% but varies between Q2 to Q4 species as a function of MO/Al2O3 ratio where Q is tetrahedral species and n the number of bridging oxygen.