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The electrochemical behaviour of samarium was investigated in LiF-BeF2 system on an inert (Mo) electrode by cyclic voltammetry and chronopotentiometry at 804,833,847 and 872 K.Redox process Sm3++e-→Sm2+ was recognized and analysed.Cyclic voltammetry data suggested that at potential sweep rates lower than 0.25 V/s,the reduction was limited by the diffusion of Sm3+ ions.It was not possible to observe reduction process of Sm2++2e-→Sm0 due to insufficient electrochemical stability of LiF-BeF2.Diffusion coefficients of Sm3+ ions in LiF- BeF2 were calculated from voltammetric and chronopotentiometric data in the temperature range 804-872 K.Diffusion coefficient values obeyed Arrhenius law.Activation energy was calculated to be 102.5 kJ/mol.