Structural investigation of the CeRh2Sb2−x compound

The crystal structure of the CeRh2Sb2−x compound was studied by powder and single crystal X-ray diffraction from as-cast and annealed at 770 K alloys. The compound crystallizes with a CeGa2Al2 structure type, space group I4/mmm: CeRh2Sb2−x (x = 0.34) (crystal I, as-cast alloy): a = 4.4925(11) Å, c = 10.1778(26) Å, V = 205.41(9) Å3, ρ =  9.530 g cm−3, μ = 31.468 mm−1, R1 = 0.0431, wR2 = 0.1187 for 103 reflections with I > 2σ(Io); CeRh2Sb2−x (x = 0.405) (crystal II, as-cast alloy): a = 4.4781(9) Å, c = 10.1652(20) Å, V = 203.85(7) Å3, ρ = 9.603 g cm−3, μ = 31.710 mm−1, R1 = 0.0397, wR2 = 0.0857 for 116 reflections with I > 2σ(Io); CeRh2Sb2−x (x = 0.24) (crystal III, annealed at 770 K sample): a = 4.5106(7) Å, c = 10.2442(16) Å, V = 208.42(6) Å3, ρ = 9.392 g cm−3, μ = 31.014 mm−1, R1 = 0.0494, wR2 = 0.1069 for 122 reflections with I > 2σ(Io); Bruker SMART CCD, data corrected for absorption using SADABS, structure refinement-WinGX 1.70.