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Separation of actinides and lanthanides between a fluorinated phase rich in LiF and a metallic phase showed that the deviation ( E ) between the theoretical and experimental results for the trivalent actinides and lanthanides can be described using a relative ionic potential Δ PI between Li + and the cations An 3+ or Ln 3+ , such that for each of the two groups E = α Δ PI + β , where α is temperature-dependent and β varies with the nature of the system. The results obtained in the MSBR development program were analyzed to determine α at various temperatures for both series of elements, and to propose expressions for Δ G ° f (AnF 3 ) versus temperature in the liquid phase (where An represents Np, Am, Cm or Cf). E was measured for U(III) and La(III) in the LiF–CaF 2 /Zn–Mg system at 720°C, and an empirical model was developed to simulate the distribution of all the trivalent actinides and lanthanides in the same system. |
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