Eu2Ir3Al9, synthesized from the elements in tantalum tubes, is one of the rare examples for trivalent europium in the field of intermetallic compounds. The compound crystallizes in the Y2Co3Ga9-type structure (space group Cmcm), with lattice parameters fitting in between the isostructural samarium and gadolinium compounds. In the crystal structure, the Eu atoms form Al-3-triangle-centered honeycomb layers and exhibit a coordination number of 17 in the shape of a fivefold-capped hexagonal prism (Eu@Ir6Al6+Al-5). Magnetic measurements indicate an overall low susceptibility, in line with van Vleck paramagnetism caused by the Eu3+ cations. Fits of the susceptibility yield a coupling constant of lambda=3D290(10) K and an effective magnetic moment of mu(eff)=3D4.56(1) mu(B), in line with a slight hybridization of the F-7(0) and F-7(1) state. Eu-151 Mossbauer spectroscopic investigations unambiguously prove the presence of solely Eu3+ in the bulk material.
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