Signatures of the glass transition in a van der Waals liquid seen by neutrons and NMR

Elga Bartsch, F. Fujara, B. Geil, M. Kiebel, W. Petry, W. Schnauss, H. Sillescu and J. Wuttke

Physica A: Statistical Mechanics and its Applications, 1993, vol. 201, issue 1, 223-236

Abstract: Mode coupling theory (MCT) of the glass transition predicts the existence of a dynamic anomaly of supercooled liquids at a characteristic temperature Tc well above the caloric glass transition temperature Tg. A series of neutron scattering and NMR experiments on van der Waals liquids - a typical example of which is orthoterphenyl (OTP) - have been performed to test three predictions and to point out signatures of the glass transition. This contribution is meant to review our results in a concise manner: there is strong evidence for a Tc according to MCT from Debye-Waller factors, from line shape studies of the dynamic structure factor and from a comparison of self-diffusion and viscosity. NMR relaxation below Tc shows that there is at least one secondary process which so far is not accounted for by MCT and that the supercooled liquid becomes truely nonergodic closely above Tg on a time scale of a few seconds.

Date: 1993
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:201:y:1993:i:1:p:223-236

DOI: 10.1016/0378-4371(93)90418-4

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