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Titolo:
Bulk and local dynamics in glass-forming liquids: A viscosity, electrical conductivity, and NMR study of aluminosilicate melts - art. no. 024206
Autore:
Gruener, G; Odier, P; Meneses, DD; Florian, P; Richet, P;
Indirizzi:
CNRS, Ctr Rech Mat & Haute Temp, F-45071 Orleans 2, France CNRS Orleans France 2 r Rech Mat & Haute Temp, F-45071 Orleans 2, France CNRS, Cristallog Lab, F-38042 Grenoble, France CNRS Grenoble France F-38042 S, Cristallog Lab, F-38042 Grenoble, France Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan Tokyo Inst Technol Yokohama Kanagawa Japan 2268503 anagawa 2268503, Japan
Titolo Testata:
PHYSICAL REVIEW B
fascicolo: 2, volume: 6402, anno: 2001,
pagine: 4206 -
SICI:
0163-1829(20010701)6402:2<4206:BALDIG>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
TEMPERATURE AL-27 NMR; SILICATE MELTS; MOLTEN SILICATES; RELAXATION; MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Gruener, G CNRS, Ctr Rech Mat & Haute Temp, F-45071 Orleans 2, France CNRS Orleans France 2 & Haute Temp, F-45071 Orleans 2, France
Citazione:
G. Gruener et al., "Bulk and local dynamics in glass-forming liquids: A viscosity, electrical conductivity, and NMR study of aluminosilicate melts - art. no. 024206", PHYS REV B, 6402(2), 2001, pp. 4206

Abstract

The viscosity and electrical conductivity and the Al-27 spin-lattice :relaxation time have been measured for two calcium aluminosilicate liquids or glasses. At high temperature, the relaxation times for the three processes are the same to within experimental errors. This similarity points to a coupling between the rate of Al-O bond exchange and the structural relaxation involved in viscous flow, which also controls the motion of Ca ions that is associated with electrical conductivity. Near the glass transition, decoupling of Ca motion is indicated by the fact that the characteristic time for calcium hopping is much shorter than the structural relaxation time. For the quenched glass, the electrical conductivity is then much higher than would be predicted from extrapolation of the high-temperature equilibrium data for the melt.

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Documento generato il 18/11/17 alle ore 03:48:33