The ternary system Eu–Cu–Ge
at 400°C
Chem.
Met. Alloys 8 (2015) 63-68
https://doi.org/10.30970/cma8.0313
Bohdana BELAN, Mykola MANYAKO, Svitlana PUKAS, Roman GLADYSHEVSKII
The isothermal section at 400°C of the phase
diagram of the system Eu–Cu–Ge
was built based on X-ray diffraction and microstructure analysis. The compound
EuCu2Ge2 (CeAl2Ga2-type structure)
was confirmed and its homogeneity region was determined: EuCu2.5-1.65Ge1.5-2.35.
In addition, three other ternary compounds were found: EuCuGe
(HoNiGa-type structure), EuCu0.8-0.5Ge1.2-1.5
(AlB2-type structure), and ~Eu2Cu2Ge (unknown
structure). The effective valence of Eu in EuCu0.8Ge1.2 was found to be 2+.
The existence of a binary homogeneity range Eu1-xCu5+2x was confirmed by
complete structure refinements.
Isothermal section of the phase
diagram of the Eu–Cu–Ge
system at 400°C.
Keywords
Phase
diagram / Crystal structure / Effective valence