机构地区: 中山大学化学与化学工程学院化学系
出 处: 《中山大学学报(自然科学版)》 1997年第2期118-121,共4页
摘 要: 用循环伏安法,恒电位电解断电后的电极电位-时间曲线研究了Pr(Ⅲ)在NaCl-KCl-PrCl3熔体中,钴电极上还原的电极过程,首先生成Pr2Co17,随后依次形成含Pr量较多的Pr-Co金属间化合物,然后才析出纯金属镨;验证了在1073K形成Pr-Co合金的数目.测得Pr2Co17,PrCo5,Pr5Co19和Pr2Co7在1073K的标准生成自由能分别为-156.33,-49.22,-188.18,-34.74kJ·mol-1.并发现在NaCl-KCl-PrCl3-CoCl2熔体中。 The cyclic voltammetry and electrode potential time curve after potentiostatic electrolysis were used to study the electrode process of Pr(Ⅲ) reduced on Co cathode in molten NaCl KCl PrCl 3. The Pr 2Co 17 forms at first and then the intermetallic compounds of Pr Co containing more Pr form in sequence. The metallic Pr deposits at last. Potential time curves have been made to testify the number of Pr Co alloys at 1 073 K. The standard free energy of formation for Pr 2Co 17 ,PrCo 5,Pr 5Co 19 and Pr 2Co 7 determined are -156.33, -49.22, -188.18,-34.74 kJ·mol -1 at 1 073 K. The electrode process of Pr(Ⅲ) and Co(Ⅱ) codeposited on Mo electrode in the molten NaCl KCl PrCl 3 CoCl 2 system has been studied.