Self-Diffusion Crossovers in Liquids
DOI:
https://doi.org/10.15407/ujpe70.9.605Keywords:
self-diffusion, crossover, phase diagram, collective contributions, low-molecular liquidsAbstract
Regions of characteristic contributions to the self-diffusion coefficient have been determined on the P − T phase diagram of low-molecular-weight liquids. The main role is played by two crossover curves that divide the region of liquid states, L, into three subregions. It is shown that, in the subregion SL, the self-diffusion coefficient is determined by two contributions, both of which are collective in nature. In the central part of the region L, the self-diffusion coefficient is also collective in nature, but it can be described with regard for only one contribution. In the subregion LG, the self-diffusion coefficient is again determined by two contributions, one of which is collective in nature, and the other is single-particle, which is characteristic of gaseous states.
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