用循环伏安法、恒电位电解断电后的电极电位—时间曲线、电位阶跃法以及X射线衍射法,研究了Pr(Ⅲ)在NaCl—KCl—PrCl_3熔体中在Ni电极上还原的电极过程,首先生成PrNi_5,随后依次生成含Pr量较多的Pr—Ni金属间化合物,然后才析出金属Pr,测得PrNi_5在1023,1073和1123K的标准生成自由能分别为-123.6,-118.9和-114.4kJmol~(-1);Pr在PrNi_5相中的扩散系数为3×10~(-11)cm~2 s~(-1)(1073K)
The cyclic vltammetry, electrode potential--time curve after potentiostatic elec-trolysis, potential step method and X--ray diffraction were used to study the electrode process ofPr(III) reduced on Ni electrode in molten NaCl--KCl--PrCl_3 and to determine the diffusioncoefficient of Pr into its alloy phase. The Pr-Ni alloys are formed before the deposition of me-tallic Pr. The PrNi_5 is formed on electrode first and then the intermetallic compounds containedmore Pr are formed in sequence. The standard free energy of formation for PrNi_5 has also beendetermined.
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