Influence of O, N, Al impurities on diffusion of 108mAg, 125Sb in liquid In

The diffusion of Ag-108m, Sb-125 radioisotopes in In melts saturated with admixtures of O, N < 0.1% at. is investigated by the capillary methodwithin the temperature range 473-1120 K. Radioisotope marks were prepared on an In base with addition of 1% at. of Al and saturated by the O, N admixtures (O, N < 0.1% at.). As revealed, Ag-108m and Sb-125 diffuse in in melts as atoms as well as nanoscale Ag(O or N)Al-y and Sb(O-x or N-x)Al-y complexes, respectively. As shown, the temperature dependence of complexes' concentration in diffusion flow may be described within the framework of the fluctuation-dissociation model on the stipulation that Ag-108m complexes consist of 3-4 atoms and Sb-125 complexes consist of 5-7 atoms (most likely, these are AgOAl, AgNAl2 and SbO3Al3). The temperatures of dissociation and effective sizes of complexes are estimated.