Institute for Materials Physics in Space, German Aerospace Center (DLR), 82234 Wessling, Germany.
Department of Physics, Bauman Moscow State Technical University, 105005 Moscow, Russia.
Molecules. 2020 Jul 31;25(15):3498. doi: 10.3390/molecules25153498.
Longitudinal and transverse sound velocities of Lennard-Jones systems are calculated at the liquid-solid coexistence using the additivity principle. The results are shown to agree well with the "exact" values obtained from their relations to excess energy and pressure. Some consequences, in particular in the context of the Lindemann's melting rule and Stokes-Einstein relation between the self-diffusion and viscosity coefficients, are discussed. Comparison with available experimental data on the sound velocities of solid argon at melting conditions is provided.
采用加和性原理，计算了 Lennard-Jones 体系在液-固共存条件下的纵波和横波声速。结果表明，这些声速与从过剩能量和压力得到的“精确”值吻合良好。讨论了一些结果，特别是在林德曼熔化规则和自扩散系数与粘性系数之间的 Stokes-Einstein 关系的背景下。还提供了在熔化条件下固体氩的声速的实验数据的比较。
