Crystal structure of the ternary compound Gd₂Ge_3.84Sn_0.92

Chem. Met. Alloys 12 (2019) 33-38

https://doi.org/10.30970/cma12.0392

Roman DANKEVYCH, Yaroslav TOKAYCHUK, Roman GLADYSHEVSKII

The new ternary intermetallic compound Gd₂Ge_3.84(4)Sn_0.92(4) was synthesized and its crystal structure was determined by X-ray powder diffraction (structure type Nd₂Ge_3.55Sn_1.24, Pearson symbol oS40, space group Cmcm, a = 4.0434(6), b = 35.284(6), c = 4.1724(6) Å, Z = 4). The structure type Nd₂Ge_3.55Sn_1.24 contains triple slabs of trigonal prisms stacked as in α‑ThSi₂ and double square-mesh atom nets. It is a member of the linear intergrowth structure series built up from segments of the structure types AlB₂, CaF₂ and α-Po. The zigzag chains of Ge atoms inside the central prism slab are deficient and the disordered atom arrangement is modeled by two split sites.

Projection of the unit cell of the structure of Gd₂Ge_3.84Sn_0.92 on the bc plane.

Keywords

Gadolinium / Germanium / Tin / X-ray powder diffraction / Crystal structure