Isothermal section of the Er–Ni–Sb ternary system at 1073 K

Chem. Met. Alloys 17 (2024) 5-12

L. ROMAKA, Yu. STADNYK, P. KLYZUB

https://doi.org/10.30970/cma17.0439

The interaction between the components in the ternary system Er–Ni–Sb was investigated by X-ray diffraction, microstructural analysis, and energy-dispersive X-ray spectroscopy in the full concentration range at 1073 K. At this temperature, the Er–Ni–Sb system is characterized by the existence of two ternary compounds: ErNiSb (structure type MgAgAs, space group F-43m, a = 0.62673(1) nm) and Er₅Ni₂Sb (structure type Mo₅SiB₂, space group I4/mcm, a = 0.7518(2), c = 1.3287(6) nm). The antimonide ErNiSb is characterized by a homogeneity range that extends from 33 to 28 at.% Ni. The binary compound (NaCl structure type) ErSb dissolves up to ~14 at.% Ni, filling the vacant 8c site in the structure of ErSb by smaller Ni atoms. The substitution-type solid solution Er₅Ni_xSb_3-x (Yb₅Sb₃-type) extends to about 6 at.% Ni.

Isothermal section of the Er-Ni-Sb system at 1073 K.

Keywords

Intermetallics / Phase diagram / X-ray diffraction / Scanning electron microscopy