TY - JOUR
T1 - Vacancy loops and stacking-fault tetrahedra in copper I. Structure and properties studied by pair and many-body potentials
AU - Osetsky, Yu N.
AU - Serra, A.
AU - Victoria, M.
AU - Golubov, S. I.
AU - Priego, V.
PY - 1999/9
Y1 - 1999/9
N2 - The structure and properties of vacancy loops (Vis) and stacking-fault tetrahedra (SFTs) in copper have been studied by computer simulation using a long-range pair interatomic potential (LRPP), obtained from the generalized pseudopotential theory, and a many-body potential (MBP) of Finnis-Sinclair type. The results obtained for these different potentials are qualitatively different. Thus, for the LRPP, significant atomic relaxation is observed for all defects. Triangular vacancy platelets relax into regular SFTsand small hexagonal clusters form Frank loops, whereas large hexagonal clusters (containing more than 37 vacancies) can dissociate into six truncated SFTswith the side equal to the (110) side of the hexagon. Similar features are observed after the relaxation of circular loops. For the MBP, on the other hand, none of the hexagonal, circular and triangular planar vacancy platelets relax into a VL or SFT but remain almost unrelaxed ‘holes’, with a relative stability which is weakly dependent on the shape. The results obtained are compared with experiment and the results of other computer simulations, and the differences stemming from the use of different interatomic potentials and different simulation methods are discussed.
AB - The structure and properties of vacancy loops (Vis) and stacking-fault tetrahedra (SFTs) in copper have been studied by computer simulation using a long-range pair interatomic potential (LRPP), obtained from the generalized pseudopotential theory, and a many-body potential (MBP) of Finnis-Sinclair type. The results obtained for these different potentials are qualitatively different. Thus, for the LRPP, significant atomic relaxation is observed for all defects. Triangular vacancy platelets relax into regular SFTsand small hexagonal clusters form Frank loops, whereas large hexagonal clusters (containing more than 37 vacancies) can dissociate into six truncated SFTswith the side equal to the (110) side of the hexagon. Similar features are observed after the relaxation of circular loops. For the MBP, on the other hand, none of the hexagonal, circular and triangular planar vacancy platelets relax into a VL or SFT but remain almost unrelaxed ‘holes’, with a relative stability which is weakly dependent on the shape. The results obtained are compared with experiment and the results of other computer simulations, and the differences stemming from the use of different interatomic potentials and different simulation methods are discussed.
UR - http://www.scopus.com/inward/record.url?scp=0040707162&partnerID=8YFLogxK
U2 - 10.1080/01418619908210421
DO - 10.1080/01418619908210421
M3 - Article
AN - SCOPUS:0040707162
SN - 0141-8610
VL - 79
SP - 2259
EP - 2283
JO - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
JF - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
IS - 9
ER -