Abstract
The molecular structures of several silicate glasses which nucleate homogeneously (CaO·SiO 2, Na 2O·SiO 2, Li 2O·SiO 2, Li 2O·2SiO 2, BaO·2SiO 2 and CaO·Al 2O 3·2SiO 2) as well as those of glasses which only nucleate heterogeneously (PbO·SiO 2, Na 2O·2SiO 2, CaO·MgO·2SiO 2, K 2O·TiO 2·3SiO 2 and Na 2O·Al 2O 3·6SiO 2) are critically analyzed and compared with the structures of their equilibrium crystalline phases. It is shown that, for the first class of glasses (displaying homogeneous nucleation), both cationic and anionic arrangements in glass and crystal are similar. In some cases, cation coordination requirements lead to the formation of chain segments of high mobility which favor homogeneous nucleation. For the second family of glasses, the structures of glass and crystal differ and only heterogeneous nucleation is observed.
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