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Test of the Einstein-Debye relation in supercooled dibutylphthalate at pressures up to 1.4 GPa
1Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland.
Physical Review Letters
|June 6, 2003
Abstract:
Broadband dielectric measurements were carried out on di-n-butyl phthalate (DBP) under isothermal conditions at hydrostatic pressures up to 1.6 GPa. A comparison of the dielectric relaxation times with the viscosity revealed that no breakdown of the Einstein-Debye relation is induced by high compression. This absence of any decoupling is attributed to the weak intermolecular cooperativity of DBP and its negligible change with pressure. Because of the latter, the dielectric spectra conform to time-pressure superpositioning.