We have investigated the dielectric properties of a 17.2 mol % mixture of chlorobenzene and decalin in the supercooled and in the glassy state under hydrostatic pressure up to 400 MPa. The dielectric loss shows the well-known primary (α) relaxation and a secondary (β) relaxation the origin of which is still being debated. The glass transition temperature increases linearly with pressure. The fragility is pressure independent. With increasing pressure the relaxation strength of the β process rises at the expense of the α process. Above around 160 K, where devitrification occurs at atmospheric pressure, the activation energy of the secondary relaxation process is roughly twice that at lower temperatures. Both energies are proportional to indicating a strong correlation between α and β processes. A possible origin of the secondary relaxation is rationalized by critical clusters in the melt.
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15 September 2000
Research Article|
September 15 2000
Glass transition in chlorobenzene–decalin under pressure
J. Köplinger;
J. Köplinger
Kirchhoff-Institut für Physik, Universität Heidelberg, D-69120 Heidelberg, Germany
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G. Kasper;
G. Kasper
Kirchhoff-Institut für Physik, Universität Heidelberg, D-69120 Heidelberg, Germany
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S. Hunklinger
S. Hunklinger
Kirchhoff-Institut für Physik, Universität Heidelberg, D-69120 Heidelberg, Germany
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J. Köplinger
G. Kasper
S. Hunklinger
Kirchhoff-Institut für Physik, Universität Heidelberg, D-69120 Heidelberg, Germany
J. Chem. Phys. 113, 4701–4706 (2000)
Article history
Received:
August 27 1999
Accepted:
June 21 2000
Citation
J. Köplinger, G. Kasper, S. Hunklinger; Glass transition in chlorobenzene–decalin under pressure. J. Chem. Phys. 15 September 2000; 113 (11): 4701–4706. https://doi.org/10.1063/1.1288904
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