Dielectric Study on the Johari-Goldstein Mode of Glass-Forming Sorbitol
Dielectric Study on the Johari-Goldstein Mode of Glass-Forming Sorbitol
复制标题
玻璃形成山梨醇的 Johari-Goldstein 模式的介电研究
DOI：
10.1143/jjap.39.l744
复制
发表时间：
2000
影响因子：
1.5
通讯作者：
R. Hayakawa
中科院分区：
文献类型：
--
作者：
T. Fujima;H. Frusawa;K. Ito;R. Hayakawa
我们精确研究了玻璃形成山梨醇介电弛豫的温度依赖性，重点关注 Johari-Goldstein (J-G) 模式。结果表明，J-G 模式的弛豫时间在高温下表现出新的依赖性，与迄今为止报道的低温下的行为不同。结果发现，在正常液体和过冷液体的交叉区域，J-G模态与α弛豫模态平滑地融合；获得的支化温度远高于先前根据松弛时间的较低温度依赖性推断的支化温度。
We investigate precisely the temperature dependence of dielectric relaxations for glass-forming sorbitol, focusing on the Johari-Goldstein (J-G) mode. The results reveal that the relaxation times of the J-G mode exhibit a new dependence at high temperatures, different from the behavior reported at low temperatures so far. As a consequence, it is found that the J-G mode merges smoothly with the α-relaxation mode in the crossover region between the normal liquid and the supercooled one; the branching temperature obtained is much higher than that previously extrapolated from the lower temperature dependence of relaxation times.