Influence of doping elements (Cu and Fe) on the crystal structure and electrical resistivity of YNi₃ and Y_0.95Ni₂

Chem. Met. Alloys 4 (2011) 152-159

https://doi.org/10.30970/cma4.0181

O. MYAKUSH, V. BABIZHETSKYY, P. MYRONENKO, H. MICHOR, E. BAUER, B. KOTUR

Two solid solutions on the basis of the binary compounds YNi₃ and Y_0.95Ni₂ were investigated by X-ray and electron probe microanalysis for the influence of Fe and Cu-doping on the crystal structure and electrical properties. Substitution of Cu for Ni in YNi₃ does not change the structure type (PuNi₃). The replacement of Ni by Cu in Y_0.95Ni_2-xCu_x up to x < 0.15 and the replacement of Ni by Fe in Y_0.95Ni_2-xFe_x up to x < 0.1 preserve the structure of the binary parent compound Y_0.95Ni₂ (TmNi₂ structure type, space group F-43m). Substitution by larger quantities of Cu and Fe destabilizes the TmNi₂ superstructure, which converts into the MgCu₂ structure with disordered Y vacancies. All the investigated alloys showed metallic-like conductivity following the Nordheim relation.

Temperature dependent electrical resistivity of solid solutions Y_0.95Ni_2‑xFe_x.

Keywords

Yttrium intermetallic compounds / Doping / Crystal structure / Electrical resistivity