Isothermal sections of the Sm–Co–Zn and Gd–Co–Zn phase diagrams at 470 K

Chem. Met. Alloys 1 (2008) 168-173

https://doi.org/10.30970/cma1.0053

Oksana Ya. ZELINSKA, Anatoliy V. ZELINSKIY, Volodymyr V. PAVLYUK

Phase equilibria in the Sm–Co–Zn and Gd–Co–Zn ternary systems have been investigated by X-ray powder diffraction. The isothermal sections of their phase diagrams have been constructed over the whole concentration range at 470 K. The Sm–Co–Zn system is characterized by the formation of six ternary compounds: Sm₂Co₂Zn₁₅, SmCo_3.2-3.5Zn_1.8-1.5, SmCo_4.4Zn_0.6, Sm₂Co₅Zn₂, SmCo₂Zn, and SmCo₂Zn₂₀. The Gd–Co–Zn system is described by the formation of four ternary compounds: Gd₂Co₂Zn₁₅, GdCo_3.5-3.8Zn_1.5-1.2, Gd₂Co₅Zn₂, and GdCo₂Zn₂₀. The maximum solid solubility of Zn at 470 K is observed in the binary SmCo₂ compound (15 at.%), and the maximum solid solubility of Co is observed in the GdZn compound (10 at.%). The homogeneity ranges of the solid solutions on the basis of the other binary phases do not exceed 5 at.%.

Isothermal section of the Sm–Co–Zn phase diagram at 470 K.

Keywords

Ternary alloy system / Phase diagram / Intermetallic compound / Solid solution