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

S. Le Tonquesse 1 M. Pasturel 1 V. Demange 1 A. Tayal 2 P.L. Solari 2 C. Prestipino 1
1 ISCR - Institut des Sciences Chimiques de Rennes
2 SSOLEIL - Synchrotron SOLEIL
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.
Keywords : Solid solutions X-ray powder Vegard's law Bond length Specific heat Thermal variables measurement X ray absorption Al content Cell parameter Long range orders Structural point Valence instability
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Journal articles
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-02310250
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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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UNIV-RENNES1 | ISCR | UR1-UFR-SPM | INC-CNRS | SYNCHROTRON-SOLEIL | UNIV-RENNES | INSA-GROUPE

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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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