Al environment in tectosilicate and peraluminous glasses: A 27Al MQ-MAS NMR, Raman, and XANES investigation.

Abstract : Tecto-aluminosilicate and peraluminous glasses have been prepared by conventional and laser heating techniques, respectively, in the CaO-Al2O3-SiO2 system. The structure of these glasses were studied using Raman spectroscopy, X-ray absorption at the Al K-edge and 27Al NMR spectroscopy with two different high fields (400 and 750 MHz). Raman spectroscopy and X-ray absorption are techniques sensitive to the network polymerization and, in particular, show different signal as a function of silica content. However, these two techniques are less sensitive than NMR to describe the local aluminium environment. For tectosilicate glasses, aluminium in five-fold coordination, [5]Al, was found and a careful quantification allows the determination of a significant amount of [5]Al (7% in the anorthite glass). The proportion of [5]Al increases for the peraluminous glasses with small amounts (<2%) of six-fold coordination, [6]Al. The presence of [5]Al agrees with previous observations of the existence of nonbridging oxygens (NBOs) in tectosilicate compositions. However, the proportion of [5]Al in the present study indicates that no major proportion of triclusters (oxygen coordinated to three (Si,Al)O4 tetrahedra) is required to explain these NBOS.
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Geochimica et Cosmochimica Acta, Elsevier, 2004, 68, pp.5071-5079. 〈10.1016/j.gca.2004.05.048〉
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https://hal.archives-ouvertes.fr/hal-00086586
Contributeur : Sylvia Deplanque <>
Soumis le : mercredi 19 juillet 2006 - 11:06:40
Dernière modification le : mardi 29 mai 2018 - 12:50:45

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Daniel-R. Neuville, Laurent Cormier, Dominique Massiot. Al environment in tectosilicate and peraluminous glasses: A 27Al MQ-MAS NMR, Raman, and XANES investigation.. Geochimica et Cosmochimica Acta, Elsevier, 2004, 68, pp.5071-5079. 〈10.1016/j.gca.2004.05.048〉. 〈hal-00086586〉

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