X-ray absorption study on the origin of the deviation from Vegard's law for U(Al1−xGex)3 solid solution

Abstract : The cell parameter evolution along the cubic U(Al1−xGex)3 solid solution shows a significant deviation from Vegard's law. The origin of such deviation has been investigated by X-ray powder and electron diffractions, EXAFS and HERFD XANES at the U L3 and Ge K edges and specific heat measurements. The results of such investigations show that, from the structural point of view, U(Al1−xGex)3 does not present any local or long range ordering and the deviation from Vegard's law is caused by valence instability of U with an actual decrease of the U–Ge bond length with increasing Al-content and cell parameter. © 2019 Elsevier B.V.
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Submitted on : Thursday, October 10, 2019 - 8:58:19 AM
Last modification on : Tuesday, November 12, 2019 - 5:02:30 PM

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S. Le Tonquesse, M. Pasturel, V. Demange, A. Tayal, P.L. Solari, et al.. X-ray absorption study on the origin of the deviation from Vegard's law for U(Al1−xGex)3 solid solution. Journal of Nuclear Materials, Elsevier, 2019, 526, pp.151772. ⟨10.1016/j.jnucmat.2019.151772⟩. ⟨hal-02310250⟩

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