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<p>Plutonium trichloride (PuCl<sub>3</sub>) was synthesized by a solid-state reaction of plutonium nitride with cadmium chloride. Electrochemical studies of PuCl<sub>3</sub>–(NaCl–2CsCl) melt at 823–923&#xa0;K revealed that Pu<sup>3+</sup> ions are reduced to Pu metal by a single-step mechanism and that the apparent standard potentials of the Pu<sup>3+</sup>/Pu<sup>0</sup> redox couple are given by <i>E</i><sup>*</sup>(Pu<sup>3+</sup>/Pu<sup>0</sup>) = − 3.514 + 8.60 × 10<sup>−4</sup>&#xa0;<i>T</i> vs. Cl<sub>2</sub>/Cl<sup>−</sup>&#xa0;(V). The activity coefficients of Pu<sup>3+</sup> ions were determined using the previously reported Gibbs free energy of formation for PuCl<sub>3</sub> in the supercooled liquid state.</p>

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Synthesis of plutonium trichloride and measurement of redox potentials for the Pu3+/Pu0 couple in NaCl–2CsCl melt

  • 期刊论文

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  • 发表日期：

    2026年5月18日

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  • Hirokazu Hayashi,
  • Kazuo Minato

摘要

Plutonium trichloride (PuCl3) was synthesized by a solid-state reaction of plutonium nitride with cadmium chloride. Electrochemical studies of PuCl3–(NaCl–2CsCl) melt at 823–923 K revealed that Pu3+ ions are reduced to Pu metal by a single-step mechanism and that the apparent standard potentials of the Pu3+/Pu0 redox couple are given by E*(Pu3+/Pu0) = − 3.514 + 8.60 × 10−4 T vs. Cl2/Cl− (V). The activity coefficients of Pu3+ ions were determined using the previously reported Gibbs free energy of formation for PuCl3 in the supercooled liquid state.