Details

Autor(en) / Beteiligte

• Uehara, Akihiro
• Shirai, Osamu
• Nagai, Takayuki
• Fujii, Toshiyuki
• Yamana, Hajimu

Titel

Spectroelectrochemistry and Electrochemistry of Europium Ions in Alkali Chloride Melts

Ist Teil von

• Zeitschrift für Naturforschung. A, A journal of physical sciences, 2007-04, Vol.62 (3), p.191-196

Ort / Verlag

Verlag der Zeitschrift für Naturforschung

Erscheinungsjahr

2007

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• In order to investigate the redox equilibrium of europium ions in molten NaCl-2CsCl, UV-Vis absorption spectrophotometry measurements were performed for Eu and Eu in molten NaCl 2CsCl at 923 K under simultaneous electrolytic control of their ratio. Molar absorptivities of EuCl and EuCl in NaCl-2CsCl at 923 K were determined to be (420±21) M cm at 31200 cm and (1130±56) M cm at 30300 cm , respectively. The formal redox potential of the Eu /Eu couple in NaCl-2CsCl melt at 923 K was determined to be (−0.941 ±0.004) V vs. Cl /Cl by electromotive force measurements on varying concentration ratios of Eu and Eu , which were performed using a technique based on the combination of electrolysis and spectrophotometry. Cyclic voltammetry was also carried out in order to examine the characteristics of the voltammograms for the Eu /Eu couple in NaCl-2CsCl melt. The formal redox potential of the Eu /Eu couple determined by a spectroelectrochemical method agreed with that determined by cyclic voltammetry [(−0.946±0.008) V vs. Cl /Cl ]. The effects of temperature on the redox potential of the Eu /Eu couple in NaCl-2CsCl, NaCl-KCl, LiCl-KCl, and CsCl melts were studied by cyclic voltammetry in the range from 923 to 1123 K.