US EPA

3030255 

Journal Article 

Accurate lattice parameter measurements of stoichiometric uranium dioxide 

Leinders, G; Cardinaels, T; Binnemans, K; Verwerft, M 

2015 

Yes 

Journal of Nuclear Materials
ISSN: 0022-3115 

459 

135-142 

10.1016/j.jnucmat.2015.01.029 

WOS:000350710700019 

The paper presents and discusses lattice parameter analyses of pure, stoichiometric UO2. Attention was; paid to prep Ire stoichiometric samples and to maintain stoichiometry throughout the analyses. The lattice parameter of UO2.000 +/- 0.001 was evaluated as being 547.127 +/- 0.008 pm at 20 degrees C, which is substantially higher than many published values for the UO2 lattice constant and has an improved precision by about one order of magnitude. The higher value of the lattice constant is mainly attributed to the avoidance of hyperstoichiometry in the present study and to a minor extent to the use of the currently accepted Cu K alpha(1) X-ray wavelength value. Many of the early studies used Cu K alpha(1) wavelength values that differ from the currently accepted value, which also contributed to an underestimation of the true lattice parameter. (C) 2015 Elsevier B.V. All rights reserved.