Details

Autor(en) / Beteiligte

• Shirai, Osamu
• Yamana, Hajimu
• Arai, Yasuo

Titel

Electrochemical behavior of actinides and actinide nitrides in LiCl–KCl eutectic melts

Ist Teil von

• Journal of alloys and compounds, 2006-02, Vol.408, p.1267-1273

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2006

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• The redox potentials of the U 3+/U, Np 3+/Np and Pu 3+/Pu couples at Mo, Cd and Bi electrodes in LiCl–KCl eutectic melt containing UCl 3, NpCl 3 and PuCl 3, respectively, were evaluated by electrochemical measurements at the temperature range between 723 and 823 K. The standard potentials of the U 3+/U, Np 3+/Np and Pu 3+/Pu couples versus the Ag +/Ag (1 wt.% AgCl) reference electrode were given by the following equations: E U 3 + / U 0 = − 1.8647 + 0.000798 × T , E N p 3 + / Np 0 = − 2.0298 + 0.000706 × T and E P u 3 + / Pu 0 = − 2.232 + 0.00094 × T , where E values are in volts, T in kelvin. The differences between the redox potentials at Mo electrode and those at liquid metal electrodes were attributable to the lowering in the activities of U, Pu and Np in liquid metal phases according to the alloy formation. Similarly, the anodic dissolutions of UN, NpN and PuN were observed at about 0.7 V more positive potential than those of U, Np and Pu, respectively, since the stabilization of U, Np and Pu by nitriding lowered the activities of U, Np and Pu, respectively, in the solid phase.