Study On The Isothermal Section Of The Dy-Fe-Ge Ternary System And Solid Phase Relationships Of DyFe_zGe₂ (z=0～4)

Phase relations in the Dy-Fe-Ge ternary system at 773K, 1073K, and the Solid phase relationships of DyFe_zGe₂(z=0-4) in the system have beeninvestigated in this work. The main contents of them were related as followed:1. The isothermal section of Dy-Fe-Ge ternary system at 773KThe phase relationships in the Dy-Fe-Ge ternary system at 773K have been investigated by means of X-ray powder diffraction. The existence of 16 binary compounds Dy₅Ge₃, Dy₅Ge₄, DyGe, Dy₂Ge₃, Dy₃Ge₅,DyGe₂, DyGe₃, DyFe₂, DyFe₃, Dyv6Fe₂₃, Dy₂Fe₁₇, Fe₃Ge, Fe₅Ge₃, Fe₆Ge₅, FeGe and FeGe₂, and five ternary compounds DyFe₄Ge₂, DyFe₂Ge₂, DyFe₆Ge₆, Dy₅Fe₂Ge₁₀ and Dy₁₁₇Fe₅₂Ge₁₁₂ were confirmed. There are 24 single-phase regions, 51 two-phase regions and 27 three-phase regions in this 773K isothermal section. A solid solution of Dy₅Fe₂Ge₁₀was found. The solid solubility range of Fe in Dy₅Fe₂Ge₁₀ is 7.7-14.3 at. %. No new ternary compound was found.2. the Solid phase relationships of DyFe_zGe₂(z=0 - 4) in the Dy-Fe-Ge systemThe Solid phase relationships of DyFev_zGe₂(z=0-4) in the Dy-Fe-Gesystem was investigated by X-ray diffraction and differential thermal analysis. There are four compounds DyGe₂, DyFe₄Ge₂, DyFe₂Ge₂ and Dy₅Fe₂Ge₁₀ in the line of Dy:Ge=1:2. In our work, it was concluded that from DyGe₂ to DyFe₄Ge₂ (from 0 to 57.1 Fe at.%) there is no phase transition below 1173K.3. The isothermal section of Dy-Fe-Ge ternary system at 1073KThe phase relationships in the Dy-Fe-Ge ternary system at 1073K have been investigated by means of X-ray powder diffraction. The existence of 14 binary compounds Dy₅Ge₃,Dy₅Ge₄,DyGe,Dy₃Ge₄, Dy₂Ge₃, Dy₃Ge₅,DyGe₂,DyGe₃, Dy₆Fe₂₃, Dy₂Fe₁₇, Fe₃Ge, Fe₅Ge₃, Fe_1.4Ge and FeGe₂, and fiveternary compounds DyFe₄Ge₂, DyFe₂Ge₂, DyFe₆Ge₆, Dy₅Fe₂Ge₁₀ and Dy₁₁₇Fe₅₂Ge₁₁₂ were confirmed. There are 22 single-phase regions, 47 two-phase regions and 25 three-phase regions in this 1073K isothermal section. A solid solution of Dy₅Fe₂Ge₁₀was found. No new ternary compound was found.