Influence of doping elements (Cu and Fe) on the crystal structure and electrical resistivity of YNi3 and Y0.95Ni2

 

Chem. Met. Alloys 4 (2011) 152-159

 

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

 

Two solid solutions on the basis of the binary compounds YNi3 and Y0.95Ni2 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 Y0.95Ni2-xCux up to x < 0.15 and the replacement of Ni by Fe in Y0.95Ni2-xFex up to x < 0.1 preserve the structure of the binary parent compound Y0.95Ni2 (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 Y0.95Ni2‑xFex.

 

Keywords

Yttrium intermetallic compounds / Doping / Crystal structure / Electrical resistivity