Phase equilibrium diagram of the Hf-Fe-Sn system at 1070 K

L. Romaka; V.V. Romaka; Yu. Stadnyk; V. Pashkevych

doi:10.15330/pcss.22.4.761-766

Authors

L. Romaka Ivan Franko National University of Lviv
V.V. Romaka Techniscne Universitat Dresden
Yu. Stadnyk Ivan Franko National University of Lviv
V. Pashkevych Lviv Polytechnic National University

DOI:

https://doi.org/10.15330/pcss.22.4.761-766

Keywords:

Intermetallics, Phase diagrams, X-ray diffraction, Scanning electron microscopy

Abstract

Experimental studies of the phase equilibrium diagram of the Hf-Fe-Sn ternary system at 1070 K were performed by X-ray powder diffractometry, scanning electron microscopy and electron probe microanalysis techniques in the whole concentration range. At annealing temperature four ternary compounds are realized: Hf₆FeSn₂ (K₂UF₆ structure type, space group P-62m), Hf_1.8Fe₅Sn_3.8 (Hf_1.82Fe₅Sn_3.82 structure type, space group Cmmm), Hf₃Fe₄Sn₄ (Zr₃Fe₄Sn₄ structure type, space group Pnma), and Hf₉Fe_3.7Sn_10.3 (Hf₉Fe₄Sn₁₀ structure type, space group Cmc2₁). An existence of the Hf_1-xFe_2+x-ySn_y solid solution formed by substitution of the iron atoms by tin in the Hf_1-xFe_2+x (MgZn₂-type) binary compound up to 19 at. % Sn was found. Solubility of Fe in the Hf₅Sn₃ binary (Mn₅Si₃-type) extends up to 10 at. % (a=0.8363(2)-0.8324(4), c=0.5726(1)-0.5686(4) nm).

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