Synthesis and crystal structure of LaNi5In and Sm2Ni2-xIn (x = 0.20)

 

Chem. Met. Alloys 4 (2011) 113-118

 

Mykola PUSTOVOYCHENKO, Volodymyr PAVLYUK, Yaroslav KALYCHAK

 

LaNi5In and Sm2Ni2-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; Sm2Ni2‑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 Sm2Ni2‑xIn is constructed from trigonal (AlB2 type) and tetragonal (CsCl type) prisms in the ratio 2:2.

 

Projection of the structure of Sm2Ni1.8In onto the [100][010] plane and coordination polyhedra of the different atom sites.

 

Keywords

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