SUPERSONIC CROWDIN-FOCUSON TANDEMS IN 3D COMPUTER MODEL OF Cu CRYSTAL

10.25712/ASTU.1811-1416.2025.03.004

Abstract

In this paper, using the method of molecular dynamics using a modified Morse potential, the prob-lem of excitation of n-crowdions in 3D models of FCC crystals is considered. The need to modify the Morse po-tential is due to the fact that when modeling the interaction of atoms at high speeds, it underestimates their diame-ters. A copper crystal model was used. The results of simultaneous triggering of several neighboring atoms located in a tightly packed row with the same kinetic energies by an order of magnitude and more exceeding the threshold energy of formation of a Frenkel pair were studied. Emerging supersonic crowdions and n-crowdions have been found to inevitably accompany a number of focusons. The number of focusons may be one less than or equal to the number of crowdions. The sum of the number of focusons and crowdions is always equal to the number of at-oms that were initially given an initial speed. With the help of a pair of atoms located several interatomic distances from each other and to which the initial kinetic energy was communicated above the threshold energy of formation of Frenkel pairs, the mechanism of transformation of crowdion into focuson was studied. The conditions are de-termined under which atoms that are given an initial kinetic energy much higher than the energy of formation of a Frenkel pair always form only crowdions.