A new interpretation of dielectric data in molecular glass formers

Details A new interpretation of dielectric data in molecular glass formers A new interpretation of dielectric data in molecular glass formers

2005-11-16

arxiv.org/abs/cond-mat/0511396v3

J. Chem. Phys 124, 094505 (2006)

Physics

Condensed Matter

Disordered Systems and Neural Networks

7 pages, 4 figures, 68 references; 3. version extended following referee advice

Scientific paper

10.1063/1.2176618

Literature dielectric data of glycerol, propylene carbonate and ortho-terphenyl (OTP) show that the measured dielectric relaxation is a decade faster than the Debye expectation, but still a decade slower than the breakdown of the shear modulus. From a comparison of time scales, the dielectric relaxation seems to be due to a process which relaxes not only the molecular orientation, but the entropy, the short-range order and the density as well. On the basis of this finding, we propose an alternative to the Gemant-DiMarzio-Bishop extension of the Debye picture.

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