A new interpretation of dielectric data in molecular glass formers | Zendy

U. Buchenau | Zendy; Michael Ohl | Zendy; A. Wischnewski | Zendy

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A new interpretation of dielectric data in molecular glass formers

Author(s) -

U. Buchenau,

Michael Ohl,

A. Wischnewski

Publication year - 2006

Publication title -

the journal of chemical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.071

H-Index - 357

eISSN - 1089-7690

pISSN - 0021-9606

DOI - 10.1063/1.2176618

Subject(s) - dielectric , propylene carbonate , materials science , relaxation (psychology) , thermodynamics , debye , cole–cole equation , condensed matter physics , chemistry , physics , psychology , social psychology , optoelectronics , electrode , electrochemistry

Literature dielectric data of glycerol, propylene carbonate andortho-terphenyl (OTP) show that the measured dielectric relaxation is a decadefaster than the Debye expectation, but still a decade slower than the breakdownof the shear modulus. From a comparison of time scales, the dielectricrelaxation seems to be due to a process which relaxes not only the molecularorientation, but the entropy, the short-range order and the density as well. Onthe basis of this finding, we propose an alternative to theGemant-DiMarzio-Bishop extension of the Debye picture.Comment: 7 pages, 4 figures, 68 references; 3. version extended following referee advic

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