Component interaction in the ternary system Lu–Fe–Sn at 670 K

Chem. Met. Alloys 14 (2021) 17-24

https://doi.org/10.30970/cma14.0415

L. ROMAKA, V.V. ROMAKA, Yu. STADNYK, I. ROMANIV

The phase equilibria in the Lu–Fe–Sn ternary system were determined at 670 K in the whole concentration range, using X-ray diffraction, scanning electron microscopy and energy-dispersive spectrometry. The Lu-Fe-Sn system is characterized by the existence of three ternary compounds at 670 K, LuFe₆Sn₆ (MgFe₆Ge₆-type, space group P6/mmm, a = 0.53741(6), c = 0.8875(1) nm), Lu₅Fe₆Sn₁₈ (Tb₄(Tb_0.6Sn_0.4)Rh₆Sn₁₈-type, space group Fm-3m, a = 1.35324(5) nm), and Lu₁₁₇Fe₅₂Sn₁₁₂ (Tb₁₁₇Fe₅₂Ge₁₁₂-type, space group Fm-3m, a = 2.9425(8) nm). An interstitial-type solid solution LuFe_xSn₂, based on the binary compound LuSn₂ (ZrSi₂-type), was found (up to 7 at.% Fe). The solubility of Sn in binary LuFe₂ (MgCu₂-type) extends up to 5 at.%.

Isothermal section of the Lu–Fe–Sn system at 670 K.

Keywords

Intermetallics / Phase diagram / Crystal structure / Stannides