Relative oxygen potential measurements of (U,Pu)O2 with Pu = 0.45 and 0.68 and related defect formation energy

A science‐based mixed oxide property model for developing advanced oxide nuclear fuels

“…Brouwer's diagram of (A) UO 2 , 2 (B) U 0.7 Pu 0.3 O 2 , 31 (C) U 0.55 Pu 0.45 O 2 , 32 (D) U 0.7 Pu 0.7 O 2 , 32 and (E) PuO 2 12 at 1873 K.…”

“…We measured the experimental data using the same method. (A) U 0.623 Pu 0.35 Am 0.027 O 2 , 14 (B) U 0.553 Pu 0.285 Am 0.015 Np 0.147 O 2 , 14 (C) U 0.688 Pu 0.29 Am 0.012 Np 0.01 O 2 , 33 (D) U 0.88 Pu 0.12 O 2 , 31 (E) U 0.8 Pu 0.2 O 2 , 34 (F) U 0.7 Pu 0.3 O 2 , 33 (G) PuO 2 , 35 (H) U 0.55 Pu 0.44 O 2 , 32 (I) U 0.3 Pu 0.7 O 2 , 32 and (J) U 0.55 Pu 0.3 Am 0.15 O 2 15…”

“…With respect to these compounds, a specific heat anomaly called the Bredig transition is observed at a temperature just below the melting point. 4,5 Moreover, the electric F I G U R E 1 Brouwer's diagram of (A) UO 2 , 2 (B) U 0.7 Pu 0.3 O 2 , 31 (C) U 0.55 Pu 0.45 O 2 , 32 (D) U 0.7 Pu 0.7 O 2 , 32 and (E) PuO 2 12 at 1873 K.…”

Cation interdiffusion in uranium–plutonium mixed oxide fuels: Where are we now?

“…To provide a complete understanding of the interdiffusion phenomena, the O/M ratio of the samples studied in the literature was either tabulated or calculated from the Pu content, temperature, and atmosphere conditions with the relation given in (Hirooka et al, 2022). Figure 12 plots the dependence of D upon temperature and O/M ratio.…”

“…Hirooka et al, 2022). Due to the attractive Coulomb (electrostatic) interaction, trivalent plutonium atoms trap oxygen vacancies, forming the clusters Pu′ − V •• O − Pu′ (for doublecharged oxygen vacancy) and/or Pu′ − V •…”