Er-Cr-Ge Ternary System

M. Konyk; L. Romaka; Yu. Stadnyk; V.V. Romaka; R. Serkiz; A. Horyn

doi:10.15330/pcss.20.4.376-383

Authors

M. Konyk Ivan Franko National University of Lviv
L. Romaka Ivan Franko National University of Lviv
Yu. Stadnyk Ivan Franko National University of Lviv
V.V. Romaka Lviv Polytechnic National University
R. Serkiz Scientific-technical and Educational Centre of low Temperature Studies, Ivan Franko National University of Lviv
A. Horyn

DOI:

https://doi.org/10.15330/pcss.20.4.376-383

Keywords:

intermetallics, ternary system, phase equilibria, crystal structure

Abstract

The isothermal section of the phase diagram of the Er–Cr–Ge ternary system was constructed at 1070 K over the whole concentration range using X-ray diffractometry, metallography and electron microprobe (EPM) analysis. The interaction between the elements in the Er−Cr−Ge system results in the formation of two ternary compounds: ErCr₆Ge₆ (MgFe₆Ge₆-type, space group P6/mmm, Pearson symbol hP13; a = 5.15149(3),
c = 8.26250(7) Ǻ; R_Bragg= 0.0493, R_F = 0.0574) and ErCr_1-хGe₂ (CeNiSi₂-type, space group Cmcm, Pearson symbol oS16, a = 4.10271(5), b = 15.66525(17), c = 3.99017(4) Ǻ; R_Bragg= 0.0473, R_F = 0.0433) at investigated temperature. For the ErCr_1-xGe₂ compound, the homogeneity region was determined (ErCr_0.28-0.38Ge₂;
a = 4.10271(5)-4.1418(9), b = 15.6652(1)-15.7581(4), c = 3.99017(4)-3.9291(1) Ǻ).

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