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|Title:||Synthesis and properties of AxV2Al20 (A = Th, U, Np, Pu) ternary actinide aluminides|
|Authors:||WINIARSKI M. J.; GRIVEAU Jean-Christophe; COLINEAU Eric; WOCHOWSKI K; WISNIEWSKI P; KACZOROWSKI D.; CACIUFFO Roberto; KLIMCZUK Tomasz|
|Citation:||JOURNAL OF ALLOYS AND COMPOUNDS vol. 696 p. 1113-1119|
|Publisher:||ELSEVIER SCIENCE SA|
|Type:||Articles in periodicals and books|
|Abstract:||Polycrystalline samples of AxV2Al20 (A ¼ Ce, Th, U, Np, Pu; 0.7 < x < 1.0) actinide intermetallics were synthesized using the arc-melting method. Crystal structure studies were performed by means of powder x-ray diffraction and the Rietveld refinement method. All studied compounds crystallize in the CeCr2Al20-type structure (space group Fd-3m, no. 227) with the actinide or Ce atom located in the oversized cage formed by Al atoms. Comparison of the crystallographic results with the reported data for LnV2Al20 (Ln ¼ lanthanides) counterparts reveals distinctly different behavior of the lanthanide- and actinide-bearing compounds. This difference is suggested to be caused by fairly localized character of the 4f electrons, whereas itinerant character of the 5f electrons is likely seen for U- and Np-containing phases. Magnetic susceptibility and specific heat measurements did not reveal any magnetic ordering in U0.8V2Al20, Np0.8V2Al20 and Pu0.8V2Al20 down to 2.5 K. A small anomaly in low-temperature specific heat of Ce0.8V2Al20, U0.8V2Al20, and Np0.8V2Al20 is observed, likely arising from a low-energy Einstein mode.|
|JRC Directorate:||Nuclear Safety and Security|
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