Diffusion coefficients of metals from iron sub-group increased in studied melts of Ni-S system, as well as in melts of Cu-S system, with rise of sulfur content in the melt together with simultaneous decrease of activation power. In melts with equal sulfur content, diffusion coefficients rise in the row Fe-Co-Ni. Besides that, 《compensating effect》 is typical for the melts of Ni-S system; this effect is manifested in correlation of preexponential factor and diffusion activation power. Previously this effect was noted in dissolution of different metals in simple metallic melts.
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