Slow secondary relaxation process in supercooled liquids

被引：214

作者：

Kudlik, A ^{[1
]}

Tschirwitz, C ^{[1
]}

Benkhof, S ^{[1
]}

Blochowicz, T ^{[1
]}

Rossler, E ^{[1
]}

机构：

[1] Univ Bayreuth, Inst Phys, D-95440 Bayreuth, Germany

来源：

EUROPHYSICS LETTERS | 1997年 / 40卷 / 06期

关键词：

D O I：

10.1209/epl/i1997-00518-y

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on dielectric susceptibility measurements for the glass-forming systems toluene and 1-propanol, both of which exhibit slow secondary relaxation (Johari beta-process). We present a complete lineshape analysis for both alpha- and beta-process covering the real and imaginary parts. The observation of secondary relaxation in the rigid molecule toluene shows that this process is not of intramolecular origin. The beta-process is well resolved in the supercooled liquid and in the glass. Above T-g a strong temperature dependence of the relaxation strength Delta epsilon(beta) is observed. For the activation energy E-beta of many glass-forming systems we find the relation E-beta proportional to T-g.

引用

页码：649 / 654

页数：6