Hopping models for ion conduction in noncrystals

Publikation: Bidrag til bog/antologi/rapportBidrag til bog/antologiForskning


Ion conduction in noncrystals (glasses, polymers, etc) has a number of properties in common. In fact, from a purely phenomenological point of view, these properties are even more widely observed: ion conduction behaves much like electronic conduction in disordered materials (e.g., amorphous semiconductors). These universalities are subject of much current interest, for instance interpreted in the context of simple hopping models. In the present paper we first discuss the temperature dependence of the dc conductivity in hopping models and the importance of the percolation phenomenon. Next, the experimental (quasi)universality of the ac conductivity is discussed. It is shown that hopping models are able to reproduce the experimental finding that the response obeys time-temperature superposition, while at the same time a broad range of activation energies is involved in the conduction process. Again, percolation is the key to understanding what is going on. Finally, some open problems in the field are listed.
TitelSuperionic Conductor Physics : Proceedings of the 1st International Discussion Meeting
RedaktørerJunichi Kawamura
Antal sider6
Udgivelses stedSingapore
ForlagWorld Scientific
ISBN (Trykt)981-270-565-1, 978-981-270-565-5
StatusUdgivet - 2007

Citer dette

Dyre, J., & Schrøder, T. (2007). Hopping models for ion conduction in noncrystals. I J. Kawamura (red.), Superionic Conductor Physics: Proceedings of the 1st International Discussion Meeting (s. 97-102). World Scientific. http://milne.ruc.dk/~dyre/2007_Kyoto_paper.pdf