New binary compounds in the Lu–Ni system

Chem. Met. Alloys 4 (2011) 89-93

https://doi.org/10.30970/cma4.0150

L. ROMAKA, V. ROMAKA, Yu. STADNYK

The binary system Lu–Ni was studied by means of X-ray powder diffraction and metallographic analysis in the whole concentration range. The presence of Lu₂Ni₁₇ (Th₂Ni₁₇ type), LuNi₅ (CaCu₅ type), LuNi₄ (own type), LuNi₂ (MgCu₂ type), and LuNi (FeB type) was confirmed and three new binary compounds, LuNi₃ (PuNi₃ type), Lu₃Ni₂ (Er₃Ni₂ type) and Lu₃Ni (Fe₃C type), were found. The crystal structures of the latter were refined to R_Bragg = 0.03-0.04. Electronic structure calculations performed for Lu₃Ni confirmed the metallic character of the bonding, with some additional electron density between Lu and Ni atoms.

Coordination polyhedrons of the Ni atoms in the structure of Lu₃Ni

Keywords

Intermetallics / Crystal structure / X-ray diffraction / Electronic structure / Bonding