The effect of heterogeneous structure of glass-forming liquids on crystal nucleation

• Published in: Journal of non-crystalline solids Vol. 462; pp. 32 - 40
• Main Authors: Abyzov, Alexander S., Fokin, Vladimir M., Yuritsyn, Nikolay S., Rodrigues, Alisson Mendes, Schmelzer, Jürn W.P.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.04.2017
• Subjects: Crystal nucleation; Glass; Thermodynamics; Thermodynamics; Crystal nucleation; Glass
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2017.02.004

A model for the description of crystal nucleation is proposed incorporating into classical nucleation theory concepts of spatial heterogeneity of glass-forming liquids. It is assumed that nucleation processes may proceed with detectable rates only in liquid-like (soft) regions and are suppressed in solid-like (rigid) parts. Determining appropriately the fraction of liquid-like solid-like regions in dependence on temperature this approach allows one to achieve a satisfactory agreement between classical nucleation theory and experiment not only at relatively high temperatures but also at temperatures lower than that of the nucleation rate maximum. The model was tested successfully on several silicate glasses revealing homogeneous volume nucleation. Some other phenomena in the interplay of crystallization and glass transition are also discussed giving an independent verification of the validity of our basic assumption. •Spatial heterogeneity concepts are employed to describe nucleation in glass-forming liquids.•This model was tested successfully on several silicate glasses.•Some related phenomena are also discussed verifying the basic hypothesis.