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RhPb 2  (rhodium dilead) is a superconductor crystallizing in the CuAl 2  structure type (space group  I 4/ mcm ). The Rh and Pb atoms are located at the 4 a  (site symmetry 422) and 8 h  ( m .2 m ) sites, respectively. The crystal structure is composed of [RhPb 8 ] antiprisms, which share their square faces along the  c  axis and the edges in the direction perpendicular to the  c  axis. We have succeeded in growing single crystals of RhPb 2  and have re-determined the crystal structure on basis of single-crystal X-ray diffraction data. In comparison with the previous structure studies using powder X-ray diffraction data [Wallbaum (1943).  Z. Metallkd .  35 , 218–221; Havinga  et al.  (1972).  J. Less-Common Met.  27 , 169–186], the current structure analysis of RhPb 2  leads to more precise unit-cell parameters and fractional coordinates, together with anisotropic displacement parameters for the two atoms. In addition and likewise different from the previous studies, we have found a slight deficiency of Rh in RhPb 2 , leading to a refined formula of Rh 0.950 (9) Pb 2 .

Redetermination of the crystal structure of RhPb2 from single-crystal X-ray diffraction data, revealing a rhodium deficiency

Redetermination of the crystal structure of RhPb₂ from single-crystal X-ray diffraction data, revealing a rhodium deficiency