Crystal Structure of the CeIr3 Compound.

Abstract The crystal structure of the CeIr 3 compound was refined for the first time from single-crystal X-ray diffraction data, down to R =0.0490, wR2=0.1052. This compound crystallizes in the PuNi 3 structure type, space group R 3 m ( a =5.290(2) A, c =26.220(4) A, Z =9, V =635.44 A 3 , ρ =16.835 g cm −3 , μ =156.36 mm −1 ). CeIr 3 belongs to the R 2 m + n M 4 m +5 n family, where m and n are the numbers of MgCu 2 - and CaCu 5 -type slabs, respectively. For CeIr 3 , m and n were found to be both equal to 1.