Measuring the configurational heat capacity of liquids.
Measuring the configurational heat capacity of liquids.
复制标题
DOI：
10.1103/physrevlett.99.185701
复制
发表时间：
2007-10
影响因子：
8.6
通讯作者：
Li-Min Wang;R. Richert
中科院分区：
文献类型：
--
作者：
Li-Min Wang;R. Richert
高电场阻抗实验的过冷分子液体的能量转移到慢模式的吸收从字段和检测的增加，他们的“构型温度”，T（cfg），通过弛豫时间的变化。这使我们能够确定构型热容量，它占了更强液体的大部分过剩热容量，但在更脆弱的系统中，只有一半的热容量步骤。它也被观察到，T（cfg）逐渐接近声子温度上的结构弛豫时间尺度。
A high electric field impedance experiment on supercooled molecular liquids is employed to transfer energy to the slow modes by absorption from the field and detect the increase of their "configurational temperature", T(cfg), via the change of the relaxation times. This allows us to determine the configurational heat capacity, which accounts for most of the excess heat capacity for stronger liquids, but for only half of the heat capacity step in the case of more fragile systems. It is also observed that T(cfg) gradually approaches the phonon temperature on the structural relaxation time scale.