Dynamics of 4-(2-hexyloxy-ethoxy) 4'-cyanobiphenyl Molecules on Approaching a Glass Transition as Studied by Dielectric Spectroscopy

• Authors: M. Massalska-Arodź , W. Witko , V. Gorbachev , L. Hartmann , F. Kremer
• Languages of publication: EN

Abstracts

EN

The complex dielectric permittivity of 4-(2-hexyloxy-ethyloxy) 4'-cyano-biphenyl measured in the frequency range from 0.03 Hz to 10^9 Hz is presented. Monotropic sequence of thermodynamic phases was found with two stable phases (isotropic and crystal) and three metastable states (supercooled isotropic phase, its glass and a smectic phase observed only on heating the sample first cooled rapidly to the liquid nitrogen temperature). In isotropic and supercooled isotropic phases the temperature dependence of the dielectric relaxation time was described by the same Vogel-Fulcher-Tammann formula while in a smectic phase it was of the Arrhenius type. In the transition from a supercooled isotropic phase to a smectic phase the relaxation rate of molecular motions around the short axes increases by two decades. Comparison of the relaxation behaviour and polymorphism of 4-(2-hexyloxy-ethyloxy) 4'-cyano-biphenyl of linear molecules with two chiral cyanobiphenyls is discussed.

Keywords

EN

64.70.Md; 64.70.Pf; 77.22.Gm

Discipline

• 77.22.Gm: Dielectric loss and relaxation

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2003
• Volume: 104
• Issue: 6
• Pages: 527-536

Dates

published

2003-12

received

2003-04-14

received

2003-09-15

Contributors

author

M. Massalska-Arodź

• The H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31-342 Kraków, Poland

author

W. Witko

• The H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31-342 Kraków, Poland

author

V. Gorbachev

• Department of Physical Chemistry, National Technical University of Ukraine, 03-056 Kiev, Ukraine

author

L. Hartmann

• University of Leipzig, Department of Physics, 04103 Leipzig, Germany

author

F. Kremer

• University of Leipzig, Department of Physics, 04013 Leipzig, Germany

References

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Identifiers

DOI

10.12693/APhysPolA.104.527