The use of Gibbs' adsorption model and dependence of the surface tensi
on of crystal planes on the number of surface atoms has allowed to obt
ain the ratio of the surface tension of the monocrystal plane to the c
oncentration of vacancies in the volume of the crystal. For typical eq
uilibrium concentration of monovacancies in the crystal, grown by the
Czochralski method, the relative excess adsorption of vacancies on sur
faces (111), (100) and (110) is equal to 7x10(7), 11x10(7) and 8x10(7)
cm(-2), respectively.