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The crystal structures of two phases in the neodymium-gold system were determined by single crystal X-ray diffractometer methods,  λ (Mo K α   = 0.7107 Å. Nd 3 Au 4  ( hR 42) is trigonal,  R [unk] (n. 148),  a  = 13.739(3) Å,  c  = 6.088(2) Å,  Z  = 6,  R  = 0.083 with 405 reflections, isotypic with Pu 3 Pd 4 . Nd 17 Au 36  ( tP 106) is tetragonal,  P 4/ nmm (n.129),  a  = 15.835(4) Å,  c  = 9.278(2) Å,  Z  = 2,  R  = 0.082 with 540 reflections. The structure of Nd 17 Au 36 , which represents a new type, can be described as packing of bicapped square antiprisms with vertices occupied by five Nd and five Au atoms and centered by part of the gold atoms. This kind of polyhedron is identical to that of aluminium in the pyramidal site of the BaAl 4  structure. In the Nd–Au system the phase Nd 17 Au 36  replaces the phase given as “NdAu 2 ”.

Crystal structure of Nd 3 Au 4 and Nd 17 Au 36