Volume 51, Number 6, September II 2000
|Page(s)||648 - 654|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Surface defreezing of glasses
The Abdus Salam International Centre for Theoretical
I-34014 Trieste, Italy
2 International School for Advanced Studies (SISSA-ISAS) - I-34014 Trieste, Italy
3 Istituto Nazionale per la Fisica della Materia (INFM), Unità SISSA - Trieste, Italy
Accepted: 24 July 2000
A glass surface may still flow below the bulk glass transition temperature, where the underlying bulk is frozen. Assuming the existence at of a bulk thermodynamical glass transition, we show that the glass-vapor interface is generally wetted by a liquid layer of thickness when . Contrary to standard surface melting of crystals however, the integrated value of the diffusivity across the interface remains finite for . Difference in shape induced by bulk and by surface flow is discussed as a possible means of experimental detection of surface defreezing.
PACS: 64.70.Pf – Glass transitions / 68.45.Gd – Wetting / 82.65.Dp – Thermodynamics of surfaces and interfaces
© EDP Sciences, 2000
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