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ELECTROCHEMICAL BEHAVIOR OF URANIUM IN ANHYDROUS FLUORIDE SOLUTIONS

铀在无水氟化物溶液中的电化学行为

基本信息

批准号：
05680407
负责人：
HARA Mitsuo
金额：
$ 0.19万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

Convenient methods have been developed for spectroscopic and electrochemical studies of uranium in anhydrous hydrogen fluoride saturated with cesium fluoride, anhydrous HF-CsF.This solvent exhibits and extended anodic potential limit (2.4 V vs. Cu/CuF_2 or 2.2 V vs. SCE at a Pt electrode) over that for water, and provides high solubility for UF_4. Solubility studies included selected lanthanide and actinide salts and oxides. It was found to be a useful solvent for studies on the various oxidation states of uranium. Uranium displayd spectroscopic and electrochemical behavior in anhydrous HF-CsF medium which was quite different from that in aqueous solutions. The oxidation of U (IV) to U (V) in anhydrous hydrogen fluoride which was not completely saturated with CsF was accomplished by simply heating the mixture. Cyclic voltammograms of the U (V) /U (IV) couple were recorded at Pt and Ni vs. Cu/CuF_2 reference electrode. The U (VI) /U (V) and U (VI) /U (IV) couples were also investigated by means of controlled-potential electrolysis. Uranium (V) apprently exists as UF_6^- in anhydrous HF-CsF.This is in contrast to aqueous solution where the U (V) species is konwn to exist as the UO_2^+ ion.

已经开发出方便的方法，用于在氟化铯饱和的无水氟化氢（无水 HF-CsF）中对铀进行光谱和电化学研究。该溶剂表现出比水更长的阳极电位限制（2.4 V vs. Cu/CuF_2 或 2.2 V vs. SCE，Pt 电极），并且为 UF_4 提供了高溶解度。溶解度研究包括选定的镧系元素和锕系元素盐和氧化物。人们发现它是研究铀的各种氧化态的有用溶剂。铀在无水HF-CsF介质中表现出与水溶液中截然不同的光谱和电化学行为。通过简单地加热混合物即可在未完全被CsF饱和的无水氟化氢中将U(IV)氧化为U(V)。在 Pt 和 Ni 与 Cu/CuF_2 参比电极上记录 U (V) /U (IV) 电对的循环伏安图。还通过控制电位电解研究了 U (VI) /U (V) 和 U (VI) /U (IV) 电对。铀 (V) 在无水 HF-CsF 中明显以 UF_6^- 形式存在。这与已知 U (V) 物质以 UO_2^+ 离子形式存在的水溶液相反。