Relaxation in the glass former acetylsalicylic acid studied by deuteron magnetic resonance and dielectric spectroscopy

R. Nath, T. El Goresy, B. Geil, H. Zimmermann, and R. Böhmer
Phys. Rev. E 74, 021506 – Published 9 August 2006

Abstract

Supercooled liquid and glassy acetylsalicylic acid was studied using dielectric spectroscopy and deuteron relaxometry in a wide temperature range. The supercooled liquid is characterized by major deviations from thermally activated behavior. In the glass the secondary relaxation exhibits the typical features of a Johari-Goldstein process. Via measurements of spin-lattice relaxation times the selectively deuterated methyl group was used as a sensitive probe of its local environments. There is a large difference in the mean activation energy in the glass with respect to that in crystalline acetylsalicylic acid. This can be understood by taking into account the broad energy barrier distribution in the glass.

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  • Received 5 April 2006

DOI:https://doi.org/10.1103/PhysRevE.74.021506

©2006 American Physical Society

Authors & Affiliations

R. Nath1, T. El Goresy1, B. Geil1, H. Zimmermann2, and R. Böhmer1

  • 1Experimentelle Physik III and Interdisziplinäres Zentrum für Magnetische Resonanz, Universität Dortmund, 44221 Dortmund, Germany
  • 2Max-Planck-Institut für Medizinische Forschung, 69120 Heidelberg, Germany

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Issue

Vol. 74, Iss. 2 — August 2006

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