Scaling of β-relaxation in the equilibrium liquid state of sorbitol
Scaling of β-relaxation in the equilibrium liquid state of sorbitol
复制标题
液态山梨醇中 β-弛豫的缩放
DOI：
10.1016/s0022-3093(98)00599-7
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发表时间：
1998
影响因子：
3.5
通讯作者：
N. B. Olsen
中科院分区：
文献类型：
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作者：
N. B. Olsen
乔哈里-戈德斯坦介电 β 弛豫已在分子液体山梨糖醇中进行了研究。在α-弛豫和β-弛豫分开的狭窄温度区间内（仍处于平衡液态），表明β-弛豫具有损耗峰值频率和幅度的温度依赖性，这与玻璃态中发现的不同。在实验误差内，β-峰值是“时间-温度不变的”（即，形状和损耗峰值频率与温度无关），而幅度随着温度的增加而遵循阿伦尼乌斯方程。最后，对于非平衡态，我们发现损失峰值频率和幅度显示出简单的等温相关性，该相关性与热历史无关。
The Johari–Goldstein dielectric β-relaxation has been studied in the molecular liquid, sorbitol. In the narrow temperature interval in which α- and β-relaxation are separated (still being in the equilibrium liquid state), it is shown that β-relaxation has a temperature-dependence of loss peak frequency and magnitude, which differs from what is found in the glassy state. Within experimental error the β-peak is “time–temperature invariant” (i.e., shape and loss peak frequency are temperature-independent), while the magnitude increases with temperature following an Arrhenius equation. Finally, for non-equilibrium states we find that loss peak frequency and magnitude show a simple isothermal correlation, which is independent of thermal history.