The solubilities of different multicomponent lanthanide oxide (Ln2O3) solid solutions including binary (Ln1 and Ln2 = La, Nd, Eu, or Tm), ternary (Ln1, Ln2, and Ln3 = La, Nd, Eu, or Tm), and higher systems (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) were studied after aging for four weeks at 60°C. Our recent study revealed that the phase transformations in binary ((La, Nd) and (La, Eu)) and ternary (La, Nd, Eu) systems are responsible for the formation of (La, Nd)(OH)3, (La, Eu)(OH)3, and (La, Nd, Eu)(OH)3 solid solutions, respectively. The variations in the mole fractions of La3+, Nd3+, and Eu3+ in the sample solutions of these hydroxide solid solutions indicated that a thermodynamic equilibrium might account for the apparent La, Nd, and Eu solubilities. Conversely, the binary and ternary systems containing Tm2O3 as the heavy lanthanide oxide retained the oxide-based solid solutions, and their solubility behaviors were dominated by their congruent dissolutions. In the higher multicomponent system, the X-ray diffraction patterns of the solid phases, before and after contact with the aqueous phase indicated the formation of a stable oxide solid solution and their solubility behavior was explained by its congruent dissolution.

1. Introduction
2. Experimental
    2.1 Materials
    2.2 Sample Preparation
    2.3 Solubility Experiment
3. Results and Discussion
    3.1 Binary and Ternary Solid Solutions of LanthanideHydroxide
    3.2 Binary and Ternary Solid Solutions of LanthanideOxide
    3.3 Discussion on the Solubilities of the Binaryand Ternary Solid Solutions
    3.4 Solid-phase and Solubility of the MulticomponentLn2O3 (1:1) Mixed System
4. Conclusions
REFERENCES

• Mohammad Moniruzzaman(Department of Nuclear Engineering, Kyoto University)
• Taishi Kobayashi(Department of Nuclear Engineering, Kyoto University) Corresponding Author
• Takayuki Sasaki(Department of Nuclear Engineering, Kyoto University)