R_xZr_2-xSb (R = La-Nd, Sm) compounds with UGeTe-type structure

Chem. Met. Alloys 16 (2023) 22-25

Oleksandr SENCHUK, Yaroslav TOKAYCHUK, Roman GLADYSHEVSKII

https://doi.org/10.30970/cma16.0435

Five ternary compounds R_xZr_2-xSb (R = La-Nd, Sm; x ≈ 0.1) were synthesized and their crystal structures were determined by X-ray powder diffraction (structure type UGeTe, Pearson symbol tI12, space group I4/mmm, Z = 4; a = 4.1296(7), c = 15.881(3) Å for La_0.08(2)Zr_0.92(2)Sb; a = 4.1431(11), c = 15.870(4) Å for Ce_0.114(19)Zr_0.886(19)Sb; a = 4.1557(13), c = 15.926(5) Å for Pr_0.14(2)Zr_0.86(2)Sb; a = 4.1426(11), c = 15.885(4) Å for Nd_0.136(18)Zr_0.864(18)Sb; a = 4.1323(7), c = 15.842(3) Å for Sm_0.104(16)Zr_0.896(16)Sb). The structure type UGeTe is a ternary ordered variant of the structure type La₂Sb. The structures are characterized by the existence of octahedral voids that may accommodate small atoms.

Octahedral voids in the structures of the R_xZr_2-xSb compounds.

Keywords

Rare-earth metals / Zirconium / Antimony / Intermetallic compound / X-ray powder diffraction / Crystal structure