Abstract
The title compounds crystallize with space group P6 3 /mcm and two formula units per cell. Their structure was determined from single-crystal X-ray data of Ho 6 Mo 4+x -Al 43-x : x=0.11(1), a=1096.8(1) pm, c=1766.6(1) pm, R=0.015 for 1130 structure factors and 53 variable parameters; and Yb 6 Cr 4+x Al 43-x : x=1.15(3), a=1086.0(2) pm, c=1757.0(3) pm, R=0,017 For 709 structure factors and 50 variables. The atoms occupy ten sites of which one shows mixed occupancy. All atoms have high coordination numbers as is typical for intermetallic phases. The rare earth atoms have 17 neighbours whereas the transitionmetal and aluminium atoms have the coordination number 12
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