COMPARATIVE-STUDY OF THE DEBYE-WALLER FACTOR ANOMALY AT THE GLASS-TRANSITION OF ISOTOPICALLY SUBSTITUTED ORTHOTERPHENYLS

被引:31
作者
DEBUS, O
ZIMMERMANN, H
BARTSCH, E
FUJARA, F
KIEBEL, M
PETRY, W
SILLESCU, H
机构
[1] MAX PLANCK INST MED RES,W-6900 HEIDELBERG,GERMANY
[2] INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE
关键词
D O I
10.1016/0009-2614(91)87152-2
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We report on neutron-scattering measurements of the Debye-Waller factor of three isotopically substituted glassy orthoterphenyls: fully protonated, fully deuterated and selectively deuterated at the lateral phenyl rings. From the comparison of the observed anomaly in the glass transition region (beta-process) found in the three systems, we can exclude any intramolecular phenyl-ring dynamics as the dominant motional mechanism for the beta-process. The data thus support mode-coupling theory proposing a center-of-mass motion as precursor process of the glass transition.
引用
收藏
页码:271 / 274
页数:4
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