8-SCATTERING STUDY OF BETA-RELAXATION IN CAKNO3 AND SALOL NEAR THE LIQUID-GLASS TRANSITION - IDEALIZED AND EXTENDED MODE-COUPLING THEORY ANALYSIS

被引：22

作者：

LI, G ^{[1
]}

FUCHS, M ^{[1
]}

DU, WM ^{[1
]}

LATZ, A ^{[1
]}

TAO, NJ ^{[1
]}

HERNANDEZ, J ^{[1
]}

GOTZE, W ^{[1
]}

CUMMINS, HZ ^{[1
]}

机构：

[1] TECH UNIV MUNICH, DEPT PHYS, W-9646 GARCHING, GERMANY

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 1994年 / 172卷

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0022-3093(94)90415-4

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Depolarized light-scattering measurements have revealed the dynamics of CaKNO3 and salol near their liquid-glass transition temperatures in the frequency range of similar to 0.2 GHz to similar to 4 THz. The two-step relaxation process predicted by the mode coupling theory was observed in the supercooled liquid near T-c. Idealized mode coupling theory analysis for the beta-relaxation region provided reasonable agreement with the scaling predictions. The crossover temperature was identified from both above and below T-c. However, systematic differences between the experimental data and the idealized theoretical beta-spectra were observed at low frequencies for temperatures near and below T-c. An extended mode coupling theory analysis, which includes the phonon-assisted hopping transport, provided a good description of the complete experimental beta-spectra. The hopping rate was quantitatively estimated from the analysis. Transition regions and trajectories were found in the temperature-hopping rate plane.

引用

页码：43 / 51

页数：9

共 20 条

[1] PERSPECTIVE ON THE GLASS-TRANSITION [J].