DETERMINATION OF PARAMETERS OF CU SURFACE MASS-TRANSPORT ON SAPPHIRE FROM MORPHOLOGICAL-CHANGES OF BEADED FILMS CAUSED BY EVAPORATION

Basic parameters of surface mass transport - the surface diffusion len gth of adatoms, lambda(s), the surface diffusion coefficient, D-s', an d the surface reaction rare coefficient, beta(s)' of Cu on alumina are determined in the temperature range 1048-1198 K. Measuring simultaneo usly the lime dependence of the effective thickness, H-eff(t), the lat eral shift of the boundary, y(t) of beaded films (BF) and using vapour pressure data we concluded that the process is controlled by surface reaction at the perimeters of beads. Supposing Arrhenius-type temperat ure dependence for D-s', beta(s)' and lambda(s) the activation energie s and preexponential factors have been calculated.