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Structure and dynamics of silicate glasses and melts

Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK

^* e:mail: ifarnan@esc.cam.ac.uk

The first 20% of the full text of this article appears below.

A one-day meeting was held in the Department of Earth Sciences, University of Cambridge, on the theme of the ‘Structure and Dynamics of Silicate Glasses and Melts’. The meeting was sponsored by the Mineral Physics group of the Mineralogical Society, and was attended by ~80 people. The objective of the meeting was to bring together experts from the glass community with members of the mineralogical community who are interested in glasses and melts. The scope of the talks considered structural details over length scales from nearest-neighbour coordinations up to 1–2 nm, and dynamics in both the slow relaxational and fast vibrational ranges. The talks also covered both experimental (particularly neutron scattering and NMR) and computer simulation methods.

The meeting was organized into three groups of themes, namely structure and dynamics in glasses, structure and dynamics in melts, and vibrational dynamics in glasses.

The opening talk was by Neville Greaves (Aberystwyth), with the title ‘Structure and ionic transport in disordered silicates’ (Greaves, 2000). This was a wide-ranging talk which addressed issues that have puzzled glass scientists for some time, namely, ionic transport in silicate glasses and the mixed alkali effect. The way in which the microstructure of a glass may be extrapolated from an existing knowledge of local structure was described (Greaves et al., 1997). This influence of microstructure on ion dynamics and also on glass fracture raised some fundamental questions about glass structure. It was noted that using wide-angle X-ray scattering of glasses and photo-electron spectroscopy of freshly cleaved glass surfaces (Baker et al., 1995), experimental evidence of a microsegregation of modifier cations was being established.

The second talk continued the theme of structure. Phil Gaskell (Cambridge, Physics) presented recent ideas on the ‘Relationships between the medium-range structures of glasses and crystals’ . . . [Full Text of this Article]