The new polymorphic modification of the equiatomic stannide CeRuSn

• 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 C2/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 R1 = 0.034 for 1806 F2 and 55 variables. The new modification has three independent crystallographic Ce sites, two of which form strongly shortened Ce–Ru contacts dCe1–Ru2 = 2.267 Å, dCe3–Ru1 = 2.434 Å and dCe3–Ru3 = 2.429 Å.

Figure optionsDownload as PowerPoint slide