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<p>The effects of different doping amounts of BaO on the structure and oxidation behavior of UO<sub>2</sub> were investigated by a series of methods. The results indicated that the solid solutions (U<sub>1-<i>y</i></sub>Ba<sub><i>y</i></sub>)O<sub>2-<i>y</i></sub> was formed after sintering. With the increase of <i>y</i> value, the lattice parameters of (U<sub>1-<i>y</i></sub>Ba<sub><i>y</i></sub>)O<sub>2-<i>y</i></sub> and oxygen vacancies increased, OOT and MRT gradually rose and O/(U + M)<sub>final</sub> decreased. The oxidation products were characterized by XRD, SEM and XPS. As <i>y</i> value increased, the average valence state of uranium decreased, the oxidation became incomplete and the average activation energy of (U<sub>1-<i>y</i></sub>Ba<sub><i>y</i></sub>)O<sub>2-<i>y</i></sub> increased from 89.50 to 125.15&#xa0;kJ/mol.</p> Graphical Abstract <p></p>

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Effect of low-dose BaO doping on structure and oxidation of UO2

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Wei Han,
  • Ming Cui,
  • Rugeng Liu,
  • Meng Zhang,
  • Mei Li

摘要

The effects of different doping amounts of BaO on the structure and oxidation behavior of UO2 were investigated by a series of methods. The results indicated that the solid solutions (U1-yBay)O2-y was formed after sintering. With the increase of y value, the lattice parameters of (U1-yBay)O2-y and oxygen vacancies increased, OOT and MRT gradually rose and O/(U + M)final decreased. The oxidation products were characterized by XRD, SEM and XPS. As y value increased, the average valence state of uranium decreased, the oxidation became incomplete and the average activation energy of (U1-yBay)O2-y increased from 89.50 to 125.15 kJ/mol.

Graphical Abstract