2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/106957Structural transitions in melts as well as their dynamics are considered. It is supposed that liquid represents the solution of relatively stable solid-like locally favored structures (LFS) in the surrounding of disordered normal-liquid structures. Within the framework of this approach the step changes of liquid Co viscosity are considered as liquid-liquid transitions. It is supposed that this sort of transitions represents the cooperative medium-range bond ordering, and corresponds to the transition of the "Newtonian fluid" to the "structured fluid". It is shown that relaxation processes with oscillating-like time behavior ($ω\sim 10^{-2}$~$s^{-1}$) of viscosity are possibly close to this point.Disordered Systems and Neural Networkstext