TEMPERATURE-DEPENDENCE OF VISCOSITY NEAR THE GLASS-TRANSITION

被引:102
作者
SJOGREN, L
机构
[1] Institute of Theoretical Physics, Chalmers University of Technology, Göteborg
来源
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER | 1990年 / 79卷 / 01期
关键词
D O I
10.1007/BF01387819
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Real glass transitions, where activated processes are included, are analysed near Whitney fold and cusp singularities. In particular the temperature dependence of the viscosity η is studied. For sufficiently strongly coupled systems there is close to a fold singularity located at T=Tc, a crossover from an algebraic divergence η∝(T-Tc)-γ for T>Tc, to an Arrhenius dependence η∝exp(E/kBT) for T<Tc. If a parameter vector specifying the system also passes close to a cusp singularity, at T0<Tc, there may be a temperature region where the viscosity also shows Fogel-Fulcher like dependence. The results for the viscosity are intimately connected with the dynamics for the so-called β-relaxation process, where relaxation occurs via a fractal time process in the delevant time region. © 1990 Springer-Verlag.
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页码:5 / 13
页数:9
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