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.
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