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Title: Solubility of Mixed Lanthanide Hydroxide and Oxide Solid Solutions
Authors: Moniruzzaman, Mohammad
Kobayashi, Taishi  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-9094-2509 (unconfirmed)
Sasaki, Takayuki  kyouindb  KAKEN_id  orcid 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
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