Electrical conductivity measurements of the alkaline earth silicate glass were performed over a wide temperature range. These measurements revealed the existence of an ionic mobility far below the glass transition temperature where the transport mechanism was thermally activated. Moreover, an original set-up based upon the 4-electrode method allowed accurate measurements in the molten state (up to 1650C) and the conductivity was described by the phenomenological Vogel–Tammann–Fulcher law. This law suggested a cooperative nature for the transport mechanism, where deformation of the network enhanced the movement of Ca2+.

Electrical Conductivity of the CaO–SiO2 System in the Solid and Molten States. M.Malki, P.Echegut: Journal of Non-Crystalline Solids, 2003, 323[1-3], 131-6