Synthesis and crystal structures of the new indides Dy₅Pd₂In and Y₅Pd₂In

Chem. Met. Alloys 9 (2016) 21-26

https://doi.org/10.30970/cma9.0317

B. BELAN, L. SOJKA, M. DEMCHYNA, M. MANYAKO, Ya. KALYCHAK

The new ternary indides Dy₅Pd₂In and Y₅Pd₂In were prepared by arc-melting of compact metals under an argon atmosphere with subsequent annealing at 870 K for 720 h. The crystal structure of Dy₅Pd₂In was determined from X-ray single crystal data: Mo₅SiB₂ structure type, space group I4/mcm, Pearson symbol tI32, Z = 4, a = 7.8490(11), c = 13.492(3) Å, R1 = 0.0399, wR2 = 0.0637, for 201 independent reflections with I > 2σ(I) and 16 variables. The crystal structure of the isotypic compound Y₅Pd₂In (refined composition Y_4.69(2)Pd₂In_1.31(2), a = 7.798(1), c = 13.598(2) Å) with statistical distribution of part of the yttrium and indium atoms was investigated using X-ray powder diffraction. All the atoms in the title compounds have relatively low coordination numbers: 14 and 16 for dysprosium, 9 for palladium, and 10 for indium, similarly to other intermetallic compounds with high rare-earth content. No strong bonding was observed in the structures.

Unit cell of the Dy₅Pd₂In compound, slabs of Al₂Cu and U₃Si₂ and coordination polyhedra of the atoms.

Keywords

Dysprosium / Palladium / Indium / Intermetallic compounds / Crystal structure / X-ray diffraction