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Polycrystalline samples of A$_x$V$_2$Al$_{20}$ (A = Ce, Th, U, Np, Pu; 0.7 =<x =< 1.0) actinide intermetallics were synthesized using the arc-meltingmethod. Crystal structure studies were performed by means of powder x-raydiffraction and the Rietveld refinement method. All studied compoundscrystallize in the CeCr$_{2}$Al$_{20}$-type structure (space group Fd-3m, no.227) with the actinide or Ce atom located in the oversized cage formed by Alatoms. Comparison of the crystallographic results with the reported data forLnV$_{2}$Al$_{20}$ (Ln = lanthanoids) counterparts reveals distinctly differentbehavior of the lanthanide- and actinide-bearing compounds. This difference issuggested to be caused by fairly localized character of the 4f electrons,whereas itinerant character of the 5f electrons is likely seen for U- andNp-containing phases. Magnetic susceptibility and specific heat measurementsdid not reveal any magnetic ordering in U$_{0.8}$V$_{2}$Al$_{20}$,Np$_{0.8}$V$_{2}$Al$_{20}$ and Pu$_{0.8}$V$_{2}$Al$_{20}$ down to 2.5 K. Asmall anomaly in low-temperature specific heat of Ce$_{0.8}$V$_{2}$Al$_{20}$,U$_{0.8}$V$_{2}$Al$_{20}$, and Np$_{0.8}$V$_{2}$Al$_{20}$ is observed, likelyarising from a low-energy Einstein mode.

Synthesis and properties of A$_x$V$_2$Al$_{20}$ (A = Th, U, Np, Pu) ternary actinide aluminides