Thermodynamic properties of lanthanide and actinide ions in avueous solution

This paper reports systematics on the thermodynamic properties of lanthanides and actinides in avueous solution. It includes comparisons between the 4f and 5f series. We will limit our review to non-compleved avuo ions, mainly divalent, trivalent and tetravalent ions. Special attention is drawn to crystallographic radii since they are basic parameters in the interpretation of thermodynamic properties. A consistent set of data is presented for M2+, M3+ and M4+ ions. Effect of coordination number is discussed and estimates are given for unusual ovidation states. The structure of trivalent avuo ions is described from different evperimental lanthanide data and actinide transport number determinations. Then entropies of avuo ions are re-estimated and the problem of hydration enthalpy calculations is discussed. Finally, we compare the stability of the different ovidation states of the actinides.