Partial Sn‐atom ordering in Sm 3 Ga 0.80–2.48 Sn 4.20–2.52

Trisamarium digallide tristannide crystallizes with a partially ordered Pu 3 Pd 5 ‐type structure in space group Cmcm . In a single crystal of Sm 3 Ga 1.89(4) Sn 3.11(4) , the 8 g position is mostly occupied by Sn atoms (93% Sn and 7% Ga), while the 4 c and 8 f positions are occupied by a Ga/Sn statistical mixture. The evolution of the structure as a function of the Ga content has been studied by X‐ray powder diffraction on ten Sm 3 Ga 5− x Sn x samples. It is shown that the 8 g position remains occupied essentially exclusively by Sn atoms within the whole homogeneity range, with x ranging from 2.52 to 4.20.