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- 저자 : Kobayashi Taishi (검색결과 2 건)
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Solubility of Mixed Lanthanide Hydroxide and Oxide Solid Solutions
Moniruzzaman, Mohammad,Kobayashi, Taishi,Sasaki, Takayuki Korean Radioactive Waste Society 2021 방사성폐기물학회지 Vol.19 No.3
The solubilities of different multicomponent lanthanide oxide (Ln<sub>2</sub>O<sub>3</sub>) solid solutions including binary (Ln<sub>1</sub> and Ln<sub>2</sub> = La, Nd, Eu, or Tm), ternary (Ln<sub>1</sub>, Ln<sub>2</sub>, and Ln<sub>3</sub> = 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℃. 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)<sub>3</sub>, (La, Eu)(OH)<sub>3</sub>, and (La, Nd, Eu)(OH)<sub>3</sub> solid solutions, respectively. The variations in the mole fractions of La<sup>3+</sup>, Nd<sup>3+</sup>, and Eu<sup>3+</sup> 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 Tm<sub>2</sub>O<sub>3</sub> 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.
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Tonna Ryutaro,Sasaki Takayuki,Kodama Yuji,Kobayashi Taishi,Akiyama Daisuke,Kirishima Akira,Sato Nobuaki,Kumagai Yuta,Kusaka Ryoji,Watanabe Masayuki 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.4
Simulated debris was synthesized using UO2, Zr, and stainless steel and a heat treatment method under inert or oxidizing conditions. The primary U solid phase of the debris synthesized at 1473 K under inert conditions was UO2, whereas a (U, Zr)O2 solid solution formed at 1873 K. Under oxidizing conditions, a mixture of U3O8 and (Fe, Cr)UO4 phases formed at 1473 K, whereas a (U, Zr)O2+x solid solution formed at 1873 K. The leaching behavior of the fission products from the simulated debris was evaluated using two methods: the irradiation method, for which fission products were produced via neutron irradiation, and the doping method, for which trace amounts of non-radioactive elements were doped into the debris. The dissolution behavior of U depended on the properties of the debris and aqueous solution for immersion. Cs, Sr, and Ba leached out regardless of the primary solid phases. The leaching of high-valence Eu and Ru ions was suppressed, possibly owing to their solid-solution reaction with or incorporation into the uranium compounds of the simulated debris.
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