TY - JOUR
T1 - The concept of matrix-mediated coupling
T2 - Workshop on Atomic Structure and Transport in Glassy Networks
AU - Ingram, Malcolm D.
AU - Roling, B.
N1 - 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.
PY - 2003/4/14
Y1 - 2003/4/14
N2 - 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.
AB - 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.
U2 - 10.1088/0953-8984/15/16/309
DO - 10.1088/0953-8984/15/16/309
M3 - Article
SN - 0953-8984
VL - 15
SP - S1595-S1605
JO - Journal of Physics: Condensed Matter
JF - Journal of Physics: Condensed Matter
IS - 16
Y2 - 24 June 2002 through 26 June 2002
ER -