Energy landscape in molecular glasses probed by high-resolution dielectric experiments
Energy landscape in molecular glasses probed by high-resolution dielectric experiments
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DOI：
10.1103/physrevb.82.104205
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发表时间：
2010-09-14
影响因子：
3.7
通讯作者：
Roessler, Ernst
中科院分区：
文献类型：
--
作者：
Gainaru, Catalin;Boehmer, Roland;Roessler, Ernst
Dielectric measurements between the glass transition temperature T(g) and about 3 K are reported for a supercooled plastic crystal and several organic molecular glasses that exhibit a secondary loss peak (beta process) close to T(g). Above about 10 K and up to T(g)/2, the dynamics can be described as a thermally activated process taking place within an energy landscape characterized by a bimodal distribution of barrier heights. This energy landscape is revealed by subjecting the dielectric loss data to an appropriate scaling involving a single free parameter. At temperatures above about T(g)/2, the scaling deteriorates for most glasses due to the emergence of the so-called excess wing.
