The concept of matrix-mediated coupling: a new interpretation of mixed-cation effects in glass

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The concept of matrix-mediated coupling assumes that coupling between movements of unlike cations in glass occurs in order to dissipate mechanical stresses created by small cations entering sites which are too large (e.g. Li+ ions entering empty sodium, (Na) over bar, sites) and large cations entering sites which are too small (e.g. Na+ ions entering empty lithium, (Li) over bar, sites). A central feature of the mixed-alkali effect is therefore the intervention of structural interactions that minimize these stresses; these processes are essentially isochoric in nature. This concept helps in the understanding of several important phenomena in addition to the high pressure effects discussed previously, including the growth/suppression effects observed in mechanical loss spectra; the strong effect of foreign cations on the conductivity in the dilute foreign alkali region; the role of divalent cations in glass and the 'anomalous' behaviour of ion-exchanged glasses.
Original languageEnglish
Pages (from-to)S1595-S1605
Number of pages11
JournalJournal of Physics: Condensed Matter
Issue number16
Publication statusPublished - 14 Apr 2003
EventWorkshop on Atomic Structure and Transport in Glassy Networks - Lyon, France
Duration: 24 Jun 200226 Jun 2002

Bibliographical note

The authors are indebted to C T Imrie (Aberdeen University, Scotland), H Jain (Lehigh University, USA), E I Kamitsos (NHRF, Athens), and to K Funke and H Eckert (University of Muenster, Germany) for discussions which helped shape the ideas advanced in this paper. One of us, MDI, wishes to thank the Alexander von Humboldt Foundation for a Research Award.


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