The formation of Frenkel defects in a bulk of the AgBr microcrystal (MC) and on its surface with participation of the surface defects was considered. The expressions for the own defect concentrations, n_i and n_v were received. For MC AgBr considered as a sphere of a radius R the dependence #PHI# chemical bounds #PHI# (r) was calculated numerically from Poisson equation. The change of surface potential, surface charge density and interstitial ions concentration was considered. The dependence of average intersititial concentration in MC and the activation energy of the ionic conductivity on MC radius wre calculated. It was shown that the analysis of the above menioned data leaded to the dependence of the formation free energy on a distance r to the MC surface.
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