Volume 64, Number 5, December 2003
|Page(s)||661 - 667|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 November 2003|
Percolative conductivity in alkaline-earth silicate melts and glasses
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
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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