Ternary eutectics in the systems FeO-UO 2 -ZrO 2 and Fe 2 O 3 -U 3 O 8 -ZrO 2

V. I. Almjashev,M. Barrachin,S. V. Bechta,D. Bottomley,S. A. Vitol,V. V. Gusarov,F. Defoort,E. V. Krushinov,D. B. Lopukh, A. V. Lysenko,A. P. Martynov,L. P. Mezentseva,A. Miassoedov,Yu. B. Petrov,M. Fischer,V. B. Khabensky,S. Hellmann

RADIOCHEMISTRY（2011）

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Abstract

The systems FeO-UO 2 -ZrO 2 (in inert atmosphere) and Fe 2 O 3 -U 3 O 8 -ZrO 2 (in air) were studied. For the FeO-UO 2 -ZrO 2 system, the eutectic temperature was found to be 1310°C, with the following component concentrations (mol %): 91.8 FeO, 3.8 UO 2 , and 4.4 ZrO 2 . For the Fe 2 O 3 -U 3 O 8 -ZrO 2 system, the eutectic temperature was found to be 1323°C, with the following component concentrations (mol %): 67.4 FeO 1.5 , 30.5 UO 2.67 , and 2.1 ZrO 2 . The solubility limits of iron oxides in the phases based on UO 2 (ZrO 2 ,FeO) and UO 2.67 (ZrO 2 ,FeO 1.5 ) were determined.

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Key words

eutectics, iron oxides, uranium oxides, zirconium dioxide, phase analysis

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