Nucleus-driven crystallization of amorphous Ge2Sb2Te5: A density functional study

have beenstudied by density functional/molecular dynamics simulations for amorphous samples (460 and 648 atoms) at500,600,and700K.Allsystemsassumedafixedcubicseedof58atomsand6vacancies.Crystallizationoccurswithin600psforthe460-atomsystemat600and700K,andsignsofcrystallization(nucleusgrowth,percolation)are present in the others. Crystallization is accompanied by an increase in the number of “