Isothermal section of the Dy-Cr-Ge system at 1073 K

Editorial Board PCSS Journal; L. Romaka; Yu. Stadnyk; V.V. Romaka; Yu. Yatskiv; M. Konyk

doi:10.15330/pcss.26.3.592-597

Authors

L. Romaka Ivan Franko National University of Lviv, Lviv, Ukraine
Yu. Stadnyk Ivan Franko National University of Lviv, Lviv, Ukraine
V.V. Romaka Technische Universität Dresden, Chair of Inorganic Chemistry II, Dresden, Germany; Institute for Solid State Research, IFW-Dresden, Dresden, Germany
Yu. Yatskiv Ivan Franko National University of Lviv, Lviv, Ukraine
M. Konyk Ivan Franko National University of Lviv, Lviv, Ukraine

DOI:

https://doi.org/10.15330/pcss.26.3.592-597

Keywords:

Intermetallics, X-ray diffraction, phase equilibria, crystal structure

Abstract

The phase equilibrium diagram of the Dy-Cr-Ge ternary system was constructed over the whole concentration range at 1073 K using methods of powder X-ray diffractometry, metallography, and electron microprobe analysis. Three ternary compounds are formed in the Dy-Cr-Ge system at the annealing temperature: Dy₁₁₇Cr₅₂Ge₁₁₂ (Tb₁₁₇Fe₅₂Ge₁₁₂ structure type_,space group Fm-3m, a = 2.8723(8) nm), DyCr₆Ge₆ (SmMn₆Sn₆ structure type, space group P6/mmm, a = 0.51642(1), c = 0.82767(2) nm), DyCr_1-xGe₂ (CeNiSi₂ structure type, space group Cmcm, a = 0.41249(5)-0.4140(3), b = 1.58287(2)-1.5890(7), c = 0.40048(5)-0.4001(2) nm). The DyCr_1-xGe₂ compound with CeNiSi₂ structure type is characterized by a small homogeneity range limited by the DyCr_0.28Ge₂ and DyCr_0.30Ge₂ compositions. The solubility of chromium in the binary germanide Dy₅Ge₃ (Mn₅Si₃-type) extends up to 4 at. %. The DFT calculations were used to evaluate the thermodynamic, elastic, and electrical properties of the DyCr_1-xGe₂ compound.

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