Title: Local Atomic Structure in (Zr1-xUx)N
Authors: WALTER MARCUSSOMERS JOSEPHFERNANDEZ CARRETERO ASUNCIONROTHE J.
Citation: JOURNAL OF NUCLEAR MATERIALS vol. 373 p. 90-93
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2008
JRC N°: JRC43866
ISSN: 0022-3115
URI: http://www.elsevier.com/locate/jnucmat
http://publications.jrc.ec.europa.eu/repository/handle/JRC43866
DOI: 10.1016/j.jnucmat.2007.05.027
Type: Articles in Journals
Abstract: (Zr1-xUx)N solid solutions were prepared for EXAFS measurements by a sol¿gel route combined with infiltration and carbothermic reduction. The lattice parameter and the more distant coordination shells (Me2 and Me3) around the Zr and U atoms follow the Vegard law. In the first coordination shell, the U¿N distance also follows the Vegard law. Though the Zr¿N bond distance increases with the lattice expansion caused by increasing U content, it remains constant at 232¿235 pm in U-rich (Zr1-xUx)N (x > 0.6). The measurements indicate that U accommodates the lattice contraction with increasing Zr content, whereas Zr is able to expand its Zr¿N bond only at lower U content. In the composition range of transmutation fuels, (Zr1- xUx)N is homogeneous at the local atomic scale.
JRC Institute:Institute for Transuranium Elements

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