Excess wing in the dielectric loss of glass formers:: A Johari-Goldstein β relaxation?

被引：329

作者：

Schneider, U ^{[1
]}

Brand, R ^{[1
]}

Lunkenheimer, P ^{[1
]}

Loidl, A ^{[1
]}

机构：

[1] Univ Augsburg, D-86135 Augsburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.84.5560

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Dielectric loss spectra of glass-forming propylene carbonate and glycerol at temperatures above and below T-g are presented. By performing aging experiments lasting up to five weeks, equilibrium spectra below T-g have been obtained. During aging, the excess wing, showing up as a second power law at high frequencies, develops into a shoulder. The results strongly suggest that the excess wing, observed in a variety of glass formers, is the high-frequency flank of a beta relaxation.

引用

页码：5560 / 5563

页数：4

共 28 条

[1]

BRAND R, CONDMAT0002460

[2] Mesoscopic mean-field theory for supercooled liquids and the glass transition [J].