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.
@article{arxiv.cond-mat/0511396,
title = {A new interpretation of dielectric data in molecular glass formers},
author = {U. Buchenau and M. Ohl and A. Wischnewski},
journal= {arXiv preprint arXiv:cond-mat/0511396},
year = {2007}
}
Comments
7 pages, 4 figures, 68 references; 3. version extended following referee advice