Abstract
• The new polymorphic modification of CeRuSn was studied by X-ray diffraction methods. • CeRuSn(II) is a superstructure of CeCoAl-type with tripling of the subcell along c axis. • In CeRuSn(II) two crystallographic Ce sites has strongly shortened Ce–Ru contacts. The atomic order of the new polymorphic modification of the equiatomic stannide CeRuSn was established from single crystal X-ray diffraction data. The new modification of CeRuSn can be described as a superstructure of CeCoAl-type with tripling of the subcell along the c axis. Space group C 2/ m , lattice parameters a = 11.5702(12) Å, b = 4.7529(5) Å, c = 15.2414(16) Å, β = 103.511(2)°, Z = 12. The structure was refined to R 1 = 0.034 for 1806 F 2 and 55 variables. The new modification has three independent crystallographic Ce sites, two of which form strongly shortened Ce–Ru contacts d Ce1 – Ru2 = 2.267 Å, d Ce3 – Ru1 = 2.434 Å and d Ce3 – Ru3 = 2.429 Å.
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