Diffusion, electrotransfer, and electrical conductivity are investigated over the temperature range 1100 1300°C in pure molybdenum, in the intermetallide MoNi, and in Mo-40 at.% Ni. The mass transfer of both components is studied in the last two alloys. The diffusion temperature parameters and the specific electrical resistance are found, and the effective charges of molybdenum and nickel are calculated. Using the experimental data obtained, the degree of ionization of the atoms of the elements investigated is determined for all items. The admissibility of application of the relations of the theory of electrotransfer in heterophase systems, developed earlier by the authors, is shown.