Dielectric spectra of the relaxation in glassy and ultraviscous liquid diethyl phthalate show that its relaxation strength , the distribution of times, and the relaxation rate are more sensitive to temperature in the ultraviscous liquid than in the glassy state. The against temperature plot has an elbow-shaped break near of , which is remarkably similar to that observed in the entropy, enthalpy, and volume against temperature plots, and in the plot of against the liquid’s entropy minus its value. The ratio of to diethyl phthalate’s entropy, after subtracting the value, is in the glassy state at , which decreases slowly to at near and thereafter rapidly increases to at . Variation in parallels the variation of the entropy. A change in the activation energy of the process at indicates that its rate is also determined by the structure of the ultraviscous liquid. Features of relaxation are consistent with localized motions of molecules and may not involve small-angle motions of all molecules.
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28 January 2006
Research Article|
January 27 2006
Orientation polarization from faster motions in the ultraviscous and glassy diethyl phthalate and its entropy
G. Power;
G. Power
Institute of Advanced Materials Science, Department of Electronic and Electrical Engineering, Trinity College,
University of Dublin
, Dublin 2, Ireland
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J. K. Vij;
J. K. Vij
a)
Institute of Advanced Materials Science, Department of Electronic and Electrical Engineering, Trinity College,
University of Dublin
, Dublin 2, Ireland
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G. P. Johari
G. P. Johari
Department of Material Science and Engineering,
McMaster University
, Hamilton, Ontario L8S 4L7, Canada
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G. Power
J. K. Vij
a)
G. P. Johari
Institute of Advanced Materials Science, Department of Electronic and Electrical Engineering, Trinity College,
University of Dublin
, Dublin 2, Irelanda)
Electronic mail: [email protected]
J. Chem. Phys. 124, 044513 (2006)
Article history
Received:
November 02 2005
Accepted:
November 29 2005
Citation
G. Power, J. K. Vij, G. P. Johari; Orientation polarization from faster motions in the ultraviscous and glassy diethyl phthalate and its entropy. J. Chem. Phys. 28 January 2006; 124 (4): 044513. https://doi.org/10.1063/1.2159473
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