The cyclic voltammetry,electrode potential-time curve after potentiostatic electrolysis, potential-step method and X-ray diffraction were used to study the electrode process of Pr(Ⅲ)reduced on Ni electrode in molten NaCl-KCl-PrCl_3.The PrNi_5 forms at first and then the intermetallic compounds of Pr-Ni containing more Pr form in sequence.The metallic Pr deposits at last.The standard free energies of formation for PrNi_5 determined are-123.6,-118.9 and-114.4 kJ mol~(-1) at 1023,1073 and 1123 K respectively.The diffusion coefficient of Pr into PrNi_5 phase determined is 3×10~(-11) cm~2 s~(-1) at 1073 K.
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