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The structures and vibrational spectra of crystals and glasses in the silica-alumina system

McMillan, P; Piriou, B; (1982) The structures and vibrational spectra of crystals and glasses in the silica-alumina system. Journal of Non-Crystalline Solids , 53 (3) pp. 279-298. 10.1016/0022-3093(82)90086-2.

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Abstract

Solar furnace melting and fast-quench techniques have been used to prepare SiO2Al2O3 glasses to high alumina content (near 60 mol% Al2O3), which have been studied by Raman spectroscopy. These spectra may not be simply interpreted. The structures of crystalline compounds in the SiO2Al2O3 system are discussed in relation to their vibrational spectra. On the basis of this discussion and other considerations, a structural model for the silica-alumina glass system is proposed, which is consistent with the stable or metastable immiscibility suggested along this join. The essential features of this model include a modified silica structure at low alumina content, and "structure-broken" regions at high alumina compositions, with silicon in tetrahedral coordination, but aluminium assuming a variety of bonding geometries. These are proposed to include aluminate tetrahedra with higher polymerization than simple corner-sharing, and less well-defined polyhedra of higher average coordination number. © 1982.

Type: Article
Title: The structures and vibrational spectra of crystals and glasses in the silica-alumina system
DOI: 10.1016/0022-3093(82)90086-2
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: http://discovery.ucl.ac.uk/id/eprint/1415306
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