Synthesis and crystal structure of LaNi₅In and Sm₂Ni_2-xIn (x = 0.20)

Chem. Met. Alloys 4 (2011) 113-118

https://doi.org/10.30970/cma4.0176

Mykola PUSTOVOYCHENKO, Volodymyr PAVLYUK, Yaroslav KALYCHAK

LaNi₅In and Sm₂Ni_2-xIn (x = 0.20) were obtained by arc-melting of compact metals under argon. Their crystal structures were refined from X-ray single crystal data: LaNi₅In crystallizes in the CeNi₅Sn structure type, space group P6₃/mmc, Z = 4, a = 4.9570(7), c = 19.969(4) Å; Sm₂Ni_2‑xIn (x = 0.20) crystallizes in the Mo₂FeB₂ structure type, space group P4/mbm, Z = 2, a = 7.523(4), c = 3.790(6) Å. The structure of LaNi₅In can be decomposed into slabs from CaCu₅ and two hypothetical compounds “LaNi₂In” and “Ni₃In” in the ratio 2:4:8. The compound Sm₂Ni_2‑xIn is constructed from trigonal (AlB₂ type) and tetragonal (CsCl type) prisms in the ratio 2:2.

Projection of the structure of Sm₂Ni_1.8In onto the [100][010] plane and coordination polyhedra of the different atom sites.

Keywords

Intermetallic compound / Crystal structure / Lanthanum / Samarium / Nickel / Indium