Dielectric and thermal relaxation in the energy landscape

Details Dielectric and thermal relaxation in the energy landscape Dielectric and thermal relaxation in the energy landscape

2006-07-03

arxiv.org/abs/cond-mat/0607056v2

Phil. Mag. 87, 389 (2007)

Physics

Condensed Matter

Disordered Systems and Neural Networks

7 pages, 3 figures, 41 references, Workshop Disordered Systems, Molveno 2006, submitted to Philosophical Magazine

Scientific paper

10.1080/14786430600936421

We derive an energy landscape interpretation of dielectric relaxation times in undercooled liquids, comparing it to the traditional Debye and Gemant-DiMarzio-Bishop pictures. The interaction between different local structural rearrangements in the energy landscape explains qualitatively the recently observed splitting of the flow process into an initial and a final stage. The initial mechanical relaxation stage is attributed to hopping processes, the final thermal or structural relaxation stage to the decay of the local double-well potentials. The energy landscape concept provides an explanation for the equality of thermal and dielectric relaxation times. The equality itself is once more demonstrated on the basis of literature data for salol.

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