| Issue |
Europhys. Lett.
Volume 64, Number 5, December 2003
|
|
|---|---|---|
| Page(s) | 661 - 667 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00278-2 | |
| Published online | 01 November 2003 | |
Percolative conductivity in alkaline-earth silicate melts and glasses
1
CRMHT-CNRS 1D - avenue de la Recherche Scientifique 45071 Orléans Cedex 02, France and Université d'Orléans - 45067 Orléans Cedex 02, France
2
Laboratoire de Physique Théorique des Liquides, Université Pierre et Marie Curie Boîte 121, 4 Place Jussieu, 75252 Paris Cedex 05, France
Received:
19
June
2003
Accepted:
15
September
2003
Ion-conducting (
)x(
)
glasses and
melts show a threshold behaviour in dc conductivity near
x=xt=0.50, with conductivities increasing linearly at 
.
We show that the behaviour can be traced to a rigid (
) to
floppy (
) elastic phase transition near x=xt. In the
floppy phase, conductivity enhancement is traced to increased
mobility or diffusion of 
carriers as the modified
network elastically softens.
PACS: 61.43.Fs – Glasses / 62.20.-x – Mechanical properties of solids
© EDP Sciences, 2003
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