Percolative conductivity in alkaline-earth silicate melts and glasses

Ion-conducting ($\chem{CaO}$)x($\chem{SiO_2}$)$_{1-x}$ glasses and melts show a threshold behaviour in dc conductivity near x=xt=0.50, with conductivities increasing linearly at $x>x_t$. We show that the behaviour can be traced to a rigid ($x0.50$) elastic phase transition near x=xt. In the flopp...

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Bibliographic Details
Published in:Europhysics letters 2003-12, Vol.64 (5), p.661-667
Main Authors: Malki, M, Micoulaut, M, Chaimbault, F, Vaills, Y, Simon, P
Format: Article
Language:English
Subjects:
61.43.Fs
62.20.-x
Condensed matter: structure, mechanical and thermal properties
Diffusion in solids
Exact sciences and technology
Physics
Self-diffusion and ionic conduction in nonmetals
Transport properties of condensed matter (nonelectronic)
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Summary:Ion-conducting ($\chem{CaO}$)x($\chem{SiO_2}$)$_{1-x}$ glasses and melts show a threshold behaviour in dc conductivity near x=xt=0.50, with conductivities increasing linearly at $x>x_t$. We show that the behaviour can be traced to a rigid ($x0.50$) elastic phase transition near x=xt. In the floppy phase, conductivity enhancement is traced to increased mobility or diffusion of $\chem{Ca^{2+}}$ carriers as the modified network elastically softens.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2003-00278-2