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Relaxation dynamics and ionic conductivity in a fragile plastic crystal Th. Bauer,1
 

Summary: Relaxation dynamics and ionic conductivity in a fragile plastic crystal
Th. Bauer,1
M. Köhler,1
P. Lunkenheimer,1,a
A. Loidl,1
and C. A. Angell2
1
Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg,
Universitätsstr. 2, 86135 Augsburg, Germany
2
Department of Chemistry and Biochemistry, Arizona State University, P.O. Box 871604, Tempe,
Arizona 85287, USA
Received 30 June 2010; accepted 17 August 2010; published online 12 October 2010
We report a thorough characterization of the dielectric relaxation behavior and the ionic
conductivity in the plastic-crystalline mixture of 60% succinonitrile and 40% glutaronitrile. The
plastic phase can be easily supercooled and the relaxational behavior is investigated by broadband
dielectric spectroscopy in the liquid, plastic crystalline, and glassy crystal phases. The -relaxation
found in the spectra is characterized in detail. A well-pronounced secondary and faint indications for
a third relaxation process were found. The latter most likely is of Johari­Goldstein type. From the
temperature dependence of the -relaxation time, a fragility parameter of 62 was determined. Thus,

  

Source: Angell, C. Austen - Department of Chemistry and Biochemistry, Arizona State University

 

Collections: Materials Science; Chemistry