Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1485861 | Journal of Non-Crystalline Solids | 2006 | 6 Pages |
Abstract
We present broadband dielectric loss spectra of the orientationally disordered (‘plastic’) crystal ortho-carborane, extending well into the infrared region and compare the results to the low-molecular weight glass former glycerol. Focusing on the high-frequency dynamics beyond 1 GHz, we find a loss minimum showing evidence for excess intensity, quite similar to the findings in canonical glass formers. In the THz region a strongly asymmetric peak shows up, which exhibits marked differences to the corresponding peaks found in glycerol and other glass-forming liquids. We discuss the relation of this feature to the boson peak detected, e.g., in light and neutron scattering experiments.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
P. Lunkenheimer, A. Loidl,