APPLICATION OF THE POSITRON TRAPPING MODEL WITH DETRAPPINGEFFECT TO STUDY THE FORMATION ENERGY OF MONOVACANCY IN SOME METALS

Abstract

By applying the positron model (PMT) without detrapping effect, the formation energy of monovacancy in metals In, Zn, Cd, AI, Pb is calculated. If the positron trapping model (PMT) with trapping effect is used, then the formation energy of monovacancy in metals In, Zn, Cd, AI, Pb are: 0,49±0.01eV,0.37 ±0.02eV,0.32±0.02eV,0.49±0.02eV and 0,46±0.02eV respectively. From these results, the ratios of concentration monovacancy in estimating without and with detrapping is shown, these ratios are larger where temperatures are higher. We can conclude that the trapping effect is non negligible in applying PTM to study monovacancy in these metals.