title: Partial Sn-atom ordering in Sm3Ga0.80-2.48Sn4.20-2.52.
abstract: 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 8g position is mostly occupied by Sn atoms (93% Sn and 7% Ga), while the 4c and 8f 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 8g position remains occupied essentially exclusively by Sn atoms within the whole homogeneity range, with x ranging from 2.52 to 4.20.
authors.affiliation: Laboratoire de Cristallographie, Université de Genève, 24, quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland. yaroslav.tokaychuk@cryst.unige.ch
authors.forename: Yaroslav O
authors.initials: YO
authors.lastname: Tokaychuk
authors.forename: Yaroslav E
authors.initials: YE
authors.lastname: Filinchuk
authors.forename: Anatoliy O
authors.initials: AO
authors.lastname: Fedorchuk
authors.forename: Oksana I
authors.initials: OI
authors.lastname: Bodak