Abstract
The crystal structure of the new compound Tb2(Cu0.47Al0.53)17 with Th2Zn17-type structure (space group R3¯m, a = 8.767(3), c = 12.824(3)Å) has been determined using single crystal X-ray diffraction leading to R = 0.036 for 407 independent Fhkl values. The crystal structure of Tb(Cu0.58Al0.42)11 has been established from X-ray powder data with atomic parameter refinement by the Rietveld method (space group Fddd, a = 14.2792(6), b = 14.8916(6), c = 6.5644(3)Å). Both structures are characterized by an icosahedral coordination of the smallest atoms.
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