Measurement of the oxygen partial pressure and thermodynamic modeling of the U-Nd-O system

JOURNAL OF NUCLEAR MATERIALS

卷:473

Article

Lee, Seung Min¹  Knight, Travis W.¹  McMurray, Jacob W.²  Besmann, Theodore M.¹ 

[1] Univ S Carolina, 300 Main St, Columbia, SC 29208 USA

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

关键词: Solid solution;    U-Nd-O;    CALPHAD method;    CEF model;    Oxygen partial pressure (pO(2));    O/M ratio;   

DOI  :  10.1016/j.jnucmat.2016.02.024

来源: Elsevier

【 摘 要 】

Fission products greatly impact the properties of fuel necessitating a thorough understanding of the thermochemical properties of oxide fuels with fission products. However, thermochemical data for the U-Nd-O system is insufficient even though neodymium is a major fission product. As neodymium will likely be present as a solute in UO2, this research focuses on the study of (U1-yNdy)O2-x. Experimental measurements and analyses of the oxygen partial pressure (pO(2))-temperature-oxygen to metal ratio (O/M ratio) relationships were performed using a thermogravimetric analyzer (TGA) and an oxygen analyzer. Thermodynamic computational modeling was performed using the CALPHAD (CALculation of PHAse Diagrams) method with the FactSage software. The Gibbs energy of the (U1-yNdy)O2-x solid solution was described by the compound energy formalism (CEF), which is based on earlier thermodynamic modeling data of the binary U-O system from Gueneau et al.. The thermodynamic and phase diagram data of the U-Nd-O system produced in this work show good agreement with the experimental data. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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