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Journal of Chemical Physics / Volume 116 / Issue 22 / ARTICLES / Surfaces, Interfaces, and Materials

J. Chem. Phys. 116, 9882 (2002); doi:10.1063/1.1473819 (7 pages)

Decoupling of the dc conductivity and (α-) structural relaxation time in a fragile glass-forming liquid under high pressure

Tatiana Psurek1, Stella Hensel-Bielowka1, Jerzy Ziolo1, and Marian Paluch2,1

1Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
2Naval Research Laboratory, Washington, D.C. 20375-5342

(Received 19 October 2001; accepted 7 March 2002)

Two relaxation processes, involving dc conductivity and the glass (α) structural relaxation, respectively, were measured in the low-molecular-weight glass-forming liquid, bisphenol- A-propoxylate(1 PO/phenol)diglycidylether, by dielectric spectroscopy, as a function of temperature and pressure. We focused on the correlation between dc conductivity and the α-relaxation time, proving that the fractional Debye–Stokes–Einstein relation is valid for both isobaric and isothermal data. The value of the exponent was independent of both temperature and pressure, and related to the ratio of the apparent activation volume of the relaxation processes being considered. The shape of the dielectric loss α peak did not change with either temperature or pressure; i.e., frequency–temperature–pressure superposition was valid in the vicinity of the glass transition. © 2002 American Institute of Physics.

© 2002 American Institute of Physics

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KEYWORDS and PACS

Keywords

organic compounds, high-pressure effects, glass transition, glass structure, dielectric relaxation, dielectric losses, supercooling, permittivity, ionic conductivity

PACS

  • 77.22.Gm

    Dielectric loss and relaxation

  • 61.43.Fs

    Glasses

  • 64.70.P-

    Glass transitions of specific systems

  • 64.70.Q-

    Theory and modeling of the glass transition

  • 66.10.Ed

    Ionic conduction

  • 62.50.-p

    High-pressure effects in solids and liquids

  • 77.22.Ch

    Permittivity (dielectric function)

  • 66.30.H-

    Self-diffusion and ionic conduction in nonmetals

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.1473819

PUBLICATION DATA

ISSN:

0021-9606 (print)  
1089-7690 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    S. Corezzi, E. Campani, P. A. Rolla, S. Capaccoli, and D. Fioretto, J. Chem. Phys. 111, 9343 (1999)JCPSA6000111000020009343000001.

    S. Hensel-Bielowka, T. Psurek, J. Ziolo, and M. Paluch, Phys. Rev. E 63, 062301 (2001).

    M. T. Cicerone and M. D. Ediger, J. Chem. Phys. 104, 7210 (1996)JCPSA6000104000018007210000001.

    M. Paluch, S. Hensel-Bielowka, and T. Psurek, J. Chem. Phys. 113, 4374 (2000)JCPSA6000113000010004374000001.

    J. J. Fontanella, J. Chem. Phys. 111, 7103 (1999)JCPSA6000111000015007103000001.


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