Percolation transition in Ag-doped germanium chalcogenide-based glasses: conductivity and silver diffusion results

Conductivity percolation transition of Agx(Ge0.25Se0.75)100−x glasses

“…In some cases, this colossal change in the conductivity occurs in a limited concentration range indicating a percolation transition [1][2][3][4][5]. As it was reported by [1], the Ag x (Ge 0.25 Se 0.75 ) 100Àx glasses behave as ionic conductors (x 6 25) showing a very sudden increase of the conductivity from 10 À13 S cm À1 to 10 À5 S cm À1 at x * % 10.…”

“…As it was reported by [1], the Ag x (Ge 0.25 Se 0.75 ) 100Àx glasses behave as ionic conductors (x 6 25) showing a very sudden increase of the conductivity from 10 À13 S cm À1 to 10 À5 S cm À1 at x * % 10. For the AgGeS and AgGeSeSb systems, the conductivity transition was observed at a very low value of the metal content (Ag concentration (1 at.%) [2][3][4][5]. These authors also proposed a percolation transition.…”

“…These sulphide and selenide glasses have several common structural characteristics: (a) the network-structural units of the chalcogenide glasses are GeCh 4 (Ch = Se, S) tetrahedra linked by edge-and corner-sharing, (b) the first diffraction peak (FSDP), which seems to be related to the intermediate range (IRO), is about q % 1 Å , and (c) the silver content increment decreases the IRO by a fragmentation of the tetrahedra chains [1][2][3][4][5][6].…”

Appearance of fast ionic conduction in AgI-doped chalcogenide glass powders prepared by mechanical milling

“…Superionic conducting glasses have attracted much attention for the last few years because of their high ionic conductivity (more than 10 À4 S cm À1 at room temperature), which is applicable to the solid-state batteries, fuel cell technologies and other electrochemical devices in place of liquid electrolytes [1][2][3][4]. A variety of silver-containing chalcogenide glasses, which is one of the high ionic conducting glasses, have been prepared by using the melt quenching method [2].…”

“…A variety of silver-containing chalcogenide glasses, which is one of the high ionic conducting glasses, have been prepared by using the melt quenching method [2]. Electrical conductivities and physical properties measurements have been performed for MI-doped As-chalcogenide glasses (M: Ag or Cu) over a wide composition range up to 60 mol% MI [1,2]. Highenergy X-ray diffraction [5], neutron diffraction [5,6] and extended X-ray absorption fine structure (EXAFS) studies [5] have also been carried out for MI-As 2 Se 3 glasses prepared by the melt-quenching method and then discussed the relationship between glass structure and ionic conduction in the MI-doped chalcogenide glass systems.…”