Issue |
Europhys. Lett.
Volume 51, Number 6, September II 2000
|
|
---|---|---|
Page(s) | 648 - 654 | |
Section | Condensed matter: structure, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i2000-00387-4 | |
Published online | 01 September 2002 |
Surface defreezing of glasses
1
The Abdus Salam International Centre for Theoretical
Physics (ICTP)
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
Received:
29
May
2000
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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