Interaction of Components in the Lu-Ag-Si System at 500 ºC

B. Belan; M. Dzevenko; M. Daszkiewicz; R. Gladyshevskii

doi:10.15330/pcss.22.1.88-93

Authors

B. Belan Ivan Franko National University of Lviv
M. Dzevenko Ivan Franko National University of Lviv
M. Daszkiewicz Institute of Low Temperature and Structure Research, Polish Academy of Sciences
R. Gladyshevskii Ivan Franko National University of Lviv

DOI:

https://doi.org/10.15330/pcss.22.1.88-93

Keywords:

ternary system, isothermal section, crystal structure

Abstract

Isothermal section of the Lu-Ag-Si system at 500ºC was studied by means of X-ray powder diffraction, microstructure and EDX-analyses in the whole concentration range. The existence of earlier reported binary compounds LuAg₄, LuAg₂, LuAg and LuSi₂, LuSi, Lu₅Si₃, Lu₅Si₄ was confirmed. New binary compound Lu₃Si₅ (own str. type) was found. Almost none of the binary silicides dissolve more than 5 at.% of third component. The exception is the existence of the substitution type solid solutions based on LuAg₂ (MoSi₂-type structure), which dissolves up to 20 at.% Si, as well as on Lu₅Si₃ (Mn₅Si₃-type structure), which dissolves up to 15 at.% Ag. The crystal structure of the LuSi compound was redetermined by X-ray single crystal diffraction (TlI-type, space group Cmcm, a = 4.1493(3), b = 10.2641(7), c = 3.7518(2) Å, R = 0.0173, wR = 0.0415 for 173 independent reflections). No ternary compound is observed in the Lu-Ag-Si system.

Author Biographies

B. Belan, Ivan Franko National University of Lviv

Faculty of Chemistry

R. Gladyshevskii , Ivan Franko National University of Lviv

Faculty of Chemistry

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