Interaction of the components and crystal structure -of the compounds in the Eu–Zn–Ga system

Keywords

europium compounds, zinc compounds, gallium compounds, intermetallics, sintering, ternary system, phase equilibria, crystal structure.

Cite as

Verbovytskyy Yu. V. Interaction of the components and crystal structure -of the compounds in the Eu–Zn–Ga system. Physico­chemical Mechanics of Materials. 2022. 58(2), 072-078.

Abstract

We establish phase equilibria in the Eu–Zn–Ga ternary system for a partial isothermal section within the range of europium concentrations 0–33.3 at.% at 400°C. The X-ray powder diffraction analysis, scanning electron microscopy, and energy dispersive X-ray spectroscopy are used to identify the phases and investigate the crystal structures and compositions of the analyzed materials. The phase equilibria of the analyzed Eu–Zn–Ga system at 400°C are characterized by the formation of four solid solutions, gallium solubility in EuZn₁₃, EuZn₁₁, and EuZn₅ and zinc solubility in EuGa₄, as well as of one continuous EuZn₂–EuGa₂ solid solution, and the existence of a ternary intermetallic compound, EuZn_x Ga_3 – x, x = 0.15. This new compound crystallizes in the CeNiSi₂ structural type (space group Cmcm) with a = 4.2900(6) Å, b = 18.405(2) Å, and c = 4.3836(7) Å. The analyzed partial isothermal section has eight ternary phase fields at 400°C.

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