Title: Synthesis and properties of AxV2Al20 (A = Th, U, Np, Pu) ternary actinide aluminides
Authors: WINIARSKI M. J.GRIVEAU Jean-ChristopheCOLINEAU EricWOCHOWSKI KWISNIEWSKI PKACZOROWSKI D.CACIUFFO RobertoKLIMCZUK Tomasz
Citation: JOURNAL OF ALLOYS AND COMPOUNDS vol. 696 p. 1113-1119
Publisher: ELSEVIER SCIENCE SA
Publication Year: 2017
JRC N°: JRC102461
ISSN: 0925-8388
URI: http://www.sciencedirect.com/science/article/pii/S092583881633941X
http://dx.doi.org/10.1016/j.jallcom.2016.12.033
http://publications.jrc.ec.europa.eu/repository/handle/JRC102461
DOI: 10.1016/j.jallcom.2016.12.033
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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