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Dynamics in a Nonfragile Glass-Forming Liquid

Published online by Cambridge University Press:  10 February 2011

B. Rufflé ,
S. Beaufils ,
J. Etrillard ,
J. Gallier ,
B. Toudic ,
C. Ecolivet ,
G. Coddens ,
J. P. Ambroise ,
E. Guéguen  and
R. Marchand
B. Rufflé
Affiliation:
Groupe Matière Condensée et Matériaux, UMR CNRS 6626, Université de Rennes 1, 35042 Rennes, France
S. Beaufils
Affiliation:
Groupe Matière Condensée et Matériaux, UMR CNRS 6626, Université de Rennes 1, 35042 Rennes, France
J. Etrillard
Affiliation:
Groupe Matière Condensée et Matériaux, UMR CNRS 6626, Université de Rennes 1, 35042 Rennes, France
J. Gallier
Affiliation:
Groupe Matière Condensée et Matériaux, UMR CNRS 6626, Université de Rennes 1, 35042 Rennes, France
B. Toudic
Affiliation:
Groupe Matière Condensée et Matériaux, UMR CNRS 6626, Université de Rennes 1, 35042 Rennes, France
C. Ecolivet
Affiliation:
Groupe Matière Condensée et Matériaux, UMR CNRS 6626, Université de Rennes 1, 35042 Rennes, France
G. Coddens
Affiliation:
Laboratoire Léon Brillouin, CE Saclay, 91191 Gif Sur Yvette, France
J. P. Ambroise
Affiliation:
Laboratoire Léon Brillouin, CE Saclay, 91191 Gif Sur Yvette, France
E. Guéguen
Affiliation:
Groupe Verres et Céramiques, URA CNRS 1496, Université de Rennes 1, 35042 Rennes, France
R. Marchand
Affiliation:
Groupe Verres et Céramiques, URA CNRS 1496, Université de Rennes 1, 35042 Rennes, France
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Abstract

The dynamics of Na0.5Li0.5PO3 (Tg = 515 K, Tm = 749 K) a non fragile glass forming liquid has been investigated over a large temperature range (300 − 1000 K.) and in a wide energy window using various experimental techniques. The susceptibility spectra obtained by coherent neutron scattering and depolarized light scattering between 1 and 104 GHz show mainly two contributions: a low frequency vibrational peak, the so-called Boson peak and a quasielastic component, referred to the βfast process in the mode coupling theory (MCT).

The data are discussed in relation to the mode coupling theory for the liquid glass transition. In particular, the temperature evolution of the susceptibility height in the βfast region is compatible with a crossover temperature Tc ∼ 620 K which is also deduced from a power law temperature dependence of the structural relaxation timescale. As a secondary βslow process, observed by 31P NMR, decouples from the structural relaxation timescale also below 600 K, a real change in the dynamics seems to occur around Tc ∼ 620 K = 1.2 Tg in this non fragile glass Conning liquid.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 455: Symposium T – Glasses and Glass Formers–Current Issues , 1996 , 151
Copyright
Copyright © Materials Research Society 1997

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References

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