Interaction of the components and crystal structure of compounds in (Gd, Er)–Re–Ge and related systems at 1070 K

Keywords

gadolinium, erbium, rhenium, germanium, ternary system, phase equilibria, ternary compound, crystal structure, structural type.

Cite as

Mykhalichko V. M., Fedyna L. O., Fedorchuk A. O., and Fedyna M. F. Interaction of the components and crystal structure of compounds in (Gd, Er)–Re–Ge and related systems at 1070 K. Physicochemical Mechanics of Materials. 2025. 61(3), 014-021.

https://doi.org/10.15407/pcmm2025.03.014

Abstract

Using X-ray diffractional phase and structural analysis and partially microstructural analysis the interaction of the components in the ternary systems (Gd, Er)–Re–Ge were investigated and the isothermal sections of the phase diagram of the system at 1070 K were constructed. At the investigated temperature, a ternary germanide is formed in both systems with a constant composition. Appreciable solubility of the third component in the compounds of binary systems was not observed. Realization of the structural type (ST) CeNiSi₂ was studied in the ternary system R–Re–Ge. The structural parameters of ternary germanides were determined: YRe_0.29(2)Ge₂ (SТ CeNiSi₂, Pearson code (PC) oS16, space group (SG) Cmcm, a = 4.1334(4), b = 15.8984(15), c = 4.0342(4) Å, R_P = 0.0293, R_B = 0.0733, χ² = 1.05); LuRe_0.20(2)Ge₂ (SТ CeNiSi₂, PC oS16, SG Cmcm, a = 4.0904(7), b = 15.650(2), c = 3.9855(6) Å, R_P = 0.0470, R_B = 0.0700, χ² = 1.74). The peculiarities of the interaction of components in R–Re–Ge systems, the specific features of the structures of the found ternary germanides of rhenium and rare-earth metals, and the peculiarities of their implementation in these systems were studied. The relationship of the structures of the studied compounds to the structural types ZrSi₂, SmNiGe₃, and ErGe_2.16 according to the nearest coordination environment of the least electronegative atoms were analyzed.

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