Experimental Investigation and Thermodynamic Simulation
of the Uranium OxideZirconium OxideIron Oxide System in
Air

Yu. B. Petrov^a,†, Yu. P. Udalov^b,*, J. Subrt^c, S. Bakardjieva^c, P. Sazavsky^d, M. Kiselova^d,
P. Selucky^d, P. Bezdicka^c, C. Journeau^e, and P. Piluso^e

^aSt. Petersburg Electrotechnical University (LETI), ul. Professora Popova 5, St. Petersburg, 197376 Russia

^bSt. Petersburg State Institute of Technology (Technical University), Moskovskii pr. 26, St. Petersburg, 198013 Russia

*e-mail: udalov@lti-gti.ru

^cInstitute of Inorganic Chemistry, ASCR, Husinec-Rez 130, Rez, 25068 Czech Republic

^dNuclear Research Institute Rez plc, Husinec-Rez 130, Rez, 25068 Czech Republic

^eCommissarriat à l’Energie Atomique, CEA/Cadarache, Severe Accident Mastering Laboratory,
St. Paul lez Durance, F13108 France

Received March 19, 2010

Abstract—The behavior of melts and the phase composition of crystallization products of six compositions in
the uranium oxide–zirconium oxide–iron oxide system in air have been investigated. It has been revealed that
crystallized samples containing 20–50 wt % uranium oxide and 25–80 wt % iron oxide (the rest is zirconium
oxide) consist of five crystalline phases and involve two types of eutectic structures. The possible factors
responsible for this phenomenon have been considered.

Keywords: uranium oxide, zirconium oxide, iron oxide, fusibility curve, oxygen partial pressure, crystalliza-
tion, phase composition

DOI: 10.1134/S108765961102012X

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