Abstract
The ternary phase Yb 4Ni 10+ x Ga 21− x has been synthesised from the elements by high frequency melting in argon atmosphere. The homogeneity region has been established from X-ray powder data and confirmed by EDX analysis for 0.3≤ x≤1. The crystal structure of Yb 4Ni 10+ x Ga 21− x has been estimated from X-ray single crystal data: space group C2/ m (no. 12), Z=2, a=20.6815(9) Å, b=4.0560(4) Å, c=15.3520(7) Å, β=124.800(3)°, R( F)=0.023 for 1701 symmetry independent reflections with F( hkl)>4 σ( F). A special feature of the structure is the local disorder within the gallium/nickel network. Neglecting atomic disorder in the region of the Ga9 and Ga11 positions, the Yb 4Ni 10+ x Ga 21− x structure is an occupation variant of the Ho 4Ni 10Ga 21 type with nickel atoms partially replacing the Ga atoms in the 2 d sites at the centers of distorted icosahedra. From magnetic susceptibility and from L III-XAS spectra, the valence state of ytterbium is near 3+.
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