### Abstract

After a short review on the existing regions and thermodynamic properties of essentially ionic ternary uranium dioxide solid solutions, M_{y}U_{1-y}O_{2+x} (x ≧< 0), classified by the valency of the M metals, a description is made for our study on the solubility and the crystal chemistry of Mg in the Mg solid solution in a range of low p_{o2}. The single phase region extended up to at least y = 0.1 at 1200°C in po = 10^{-15} or ≤ 10^{-19} atm. Density measurements revealed that the Mg atoms in the solid solution formed under the above conditions are about 60% in the interstitial sites. This experimental result was rationalized by the calculated ΔḠ_{O2} change caused from the configurational partial molar entropy obtained through the lattice statistics of the occupation of Mg and oxygen atoms in the solid solution lattice sites.

Original language | English |
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Pages (from-to) | 265-272 |

Number of pages | 8 |

Journal | Journal of Nuclear Materials |

Volume | 247 |

DOIs | |

Publication status | Published - 1997 Aug |

### ASJC Scopus subject areas

- Nuclear and High Energy Physics
- Materials Science(all)
- Nuclear Energy and Engineering

## Fingerprint Dive into the research topics of 'Characteristic thermodynamic properties of M<sub>y</sub>U<sub>1</sub>-<sub>y</sub>O<sub>2</sub>+<sub>x</sub> (M = M<sup>4+</sup>, M<sup>3+</sup> and M<sup>2+</sup>; x ≧< 0) solid solutions and the phase behavior of Mg solid solution in low oxygen pressures'. Together they form a unique fingerprint.

## Cite this

_{y}U

_{1}-

_{y}O

_{2}+

_{x}(M = M

^{4+}, M

^{3+}and M

^{2+}; x ≧< 0) solid solutions and the phase behavior of Mg solid solution in low oxygen pressures.

*Journal of Nuclear Materials*,

*247*, 265-272. https://doi.org/10.1016/S0022-3115(97)00074-3