Abstract
The phase diagram of the system U‐Mo‐O in the region UO2‐MoO2‐O was investigated by X‐ray phase analysis and electromotive force measurements. The isothermal section at 1000 K is presented. The free energy of formation of UMoO5was determined from the oxygen potential measurement by a ZrO2.CaO solid electrolyte galvanic cell. This gave at 1000 KA redetermination of the free energy of formation of MoO2 yielded (ΔG in kJ.mol−1)for 1040 to 1290 K. The free energies of formation of three other phases were calculated using the key values from the literature, and the phase diagram obtained in the present investigation. The values at 1000 K areFrom the present investigation it was concluded that ternary phases of the system U‐Mo‐O will not play any role in the fission product‐fuel interaction, while in the nuclear waste calcine, only UMoO6 could be of importance. A vaporization study of the latter phase has been suggested.
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