Abstract
Absorption spectra of the NpO +2 ion in UO 2+2 -containing NaCl-KCl-CsCl (0.300:0.245:0.455) and LiCl-KCl-CsCl (0.575:0.165:0.260) eutectic melts in the region of the 5f-5f transitions, 700–2000 nm, were studied at 650 and 500°C, respectively. Processing of the spectra allowed the previously discovered phenomenon, cation-cation interaction of actinides in melts, to be interpreted for the first time in terms of the mass action law. It was shown that, at the concentrations of the interacting components studied (C Np = 0.2 M and C U = 0.1–2 M), a 1: 1 NpO +2 ·UO 2+2 cation-cation complex is formed. Its concentration stability constant was estimated at 0.06(6) and 0.11 1 mol−1 for the NaCl-KCl-CsCl and LiCl-KCl-CsCl systems, respectively.
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Original Russian Text © Yu.A. Barbanel’, R.B. Dushin, V.V. Kolin, V.P. Kotlin, L.G. Mashirov, S.N. Nekhoroshkov, 2006, published in Radiokhimiya, 2006, Vol. 48, No. 2, pp. 134–137.
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Barbanel’, Y.A., Dushin, R.B., Kolin, V.V. et al. NpO +2 -UO 2+2 cation-cation interaction in NaCl-KCl-CsCl and LiCl-KCl-CsCl eutectic melts. Radiochemistry 48, 148–151 (2006). https://doi.org/10.1134/S106636220602007X
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DOI: https://doi.org/10.1134/S106636220602007X