Positron annihilation characteristics in Zn_1-xMg_xSe Mixed crystals

摘要

Positron annihilation characteristics as a function of composition and annealing in zinc vapour were measured and compared with photolumines- cence spectra for Zn_1-xMg_xSe mixed crystals with 0≤x≤0.6. The positron annihilation data show that there is a substantial number of divacancies present in the system under study. The concentration of such defects is re- duced at least by the factor of two upon annealing in zinc vapour.