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Title: | Solubility of Mixed Lanthanide Hydroxide and Oxide Solid Solutions |
Authors: | Moniruzzaman, Mohammad Kobayashi, Taishi https://orcid.org/0000-0001-9094-2509 (unconfirmed) Sasaki, Takayuki https://orcid.org/0000-0002-0452-8211 (unconfirmed) |
Author's alias: | 小林, 大志 佐々木, 隆之 |
Keywords: | Lanthanide Oxide Hydroxide Solid solution Solubility |
Issue Date: | Sep-2021 |
Publisher: | The Korean Radioactive Waste Society |
Journal title: | Journal of Nuclear Fuel Cycle and Waste Technology |
Volume: | 19 |
Issue: | 3 |
Start page: | 353 |
End page: | 366 |
Abstract: | 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. |
Rights: | This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited |
URI: | http://hdl.handle.net/2433/276817 |
DOI(Published Version): | 10.7733/jnfcwt.2021.19.3.353 |
Appears in Collections: | Journal Articles |
This item is licensed under a Creative Commons License