Crossref journal-article
AIP Publishing
The Journal of Chemical Physics (317)
Abstract

We report dielectric data on six different plastic crystalline materials, namely 1-cyanoadamantane, adamantanone, pentachloronitrobenzene, cyclo-hexanol, ethanol, and meta-carborane, covering a frequency range of up to 14 decades and up to 20 GHz. Information on phase transitions, the α-relaxation, and relaxation processes beyond the α-relaxation are provided. The α-relaxation shows clear non-Debye behavior and varying degrees of deviation from thermally activated behavior. Our results reveal a generally rather low fragility of plastic crystals. In some of the investigated materials evidence for Johari–Goldstein type β-relaxations is obtained. In addition, the question of the so-called excess wing of the α-relaxation peak is addressed in detail. In all cases, it is either absent or can be ascribed to a β-relaxation submerged under the α-peak. Overall, the present work provides a broad database on the dielectric behavior of plastic crystals, and may be taken as a review of the dynamic phenomena occurring in these materials, many of them being observed also in structural glass formers.

Bibliography

Brand, R., Lunkenheimer, P., & Loidl, A. (2002). Relaxation dynamics in plastic crystals. The Journal of Chemical Physics, 116(23), 10386–10401.

Authors 3
  1. R. Brand (first)
  2. P. Lunkenheimer (additional)
  3. A. Loidl (additional)
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Dates
Type When
Created 23 years, 1 month ago (July 26, 2002, 10:23 a.m.)
Deposited 1 year, 7 months ago (Jan. 3, 2024, 11:10 p.m.)
Indexed 1 month, 1 week ago (July 24, 2025, 7:41 a.m.)
Issued 23 years, 3 months ago (May 30, 2002)
Published 23 years, 3 months ago (May 30, 2002)
Published Online 23 years, 3 months ago (May 30, 2002)
Published Print 23 years, 2 months ago (June 15, 2002)
Funders 0

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@article{Brand_2002, title={Relaxation dynamics in plastic crystals}, volume={116}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.1477186}, DOI={10.1063/1.1477186}, number={23}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Brand, R. and Lunkenheimer, P. and Loidl, A.}, year={2002}, month=may, pages={10386–10401} }