INDICATIONS FOR A CHANGE OF DIFFUSION MECHANISM IN SUPERCOOLED LIQUIDS

被引：304

作者：

ROSSLER, E

机构：

[1] Institut F̈r Atom- und Festkörperphysik, Freie Universität Berlin, D-1000 Berlin 33

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 65卷 / 13期

关键词：

35;

D O I：

10.1103/PhysRevLett.65.1595

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Indications for a crossover between two distinct dynamical regimes at a temperature Tc above the glass-transition temperature Tg are presented for simple supercooled liquids. (i) Relating diffusion coefficient D and reorientational correlation times with viscosity, a discontinuity for the temperature coefficient of / or 1/D is observed, demonstrating the failure of the Stokes-Einstein relations for T<Tc. (ii) Plotting NMR and dielectric correlation times on a reduced scale Tg/T shows that a bifurcation of the two relevant processes in a supercooled liquid (+ and 2 processes) appears for T<Tc. Tc is found at T/Tg=1.18e1.28. © 1990 The American Physical Society.

引用

页码：1595 / 1598

页数：4

共 35 条

[1] TRANSPORT IN MOLTEN SALTS UNDER PRESSURE .I. GLASS-FORMING NITRATE MELTS [J].