New compound Sm2Ru3Sn5 with a structure derived from Ru3Sn7

Abstract Ternary intermetallic compound Sm 2 Ru 3 Sn 5 was synthesized in the system Sm-Ru-Sn by arc-melting and annealing at 600 °C in the field with high content of Sn. Its crystal structure was determined using single crystal X-ray diffraction data (at 240 K). The compound crystallizes in cubic system with space group I 4 ‾ 3 m (No. 217), unit cell parameter is a = 9.4606 (8) Å, Z = 4, Pearson symbol c/40. The intermetallic compound Sm 2 Ru 3 Sn 5 represents an ordered version of the centrosymmetric Ru 3 Sn 7 structure (space group Im 3 ‾ m ), in which 16 f Sn-filled crystallographic site is split into two 8 c sites, each of which is solely occupied of one sort of atoms – Sn or Sm. The occupation of these two 8 c sites leads to a reduction of symmetry due to the removal of the inversion center.