Isothermal Section Of The Gd-Co-V Ternary System At 773 K

The isothermal section of the phase diagram of the Gd-Co-V ternary system at 773K was investigated by X-ray powder diffraction(XRD),metallographic analysis,electron probe microanalysis,and differential thermal analysis(DTA) techniques.The isothermal section consists of 14 single-phase regions,26 two-phase regions and 13 three-phase regions.The solid solubility of V in the compounds Co₁₇Gd₂,Co₃Gd,Co₂Gd,Co₇Gd₁₂and CoGd₃ were about 11.0,2.0, 6.0,1.2 and 5.3 at.%V,respectively.It was found that there are some homogeneity range in the only ternary compound of GdCo_12-xV_x with x = 2.6 to 3.7 at 773K.No other ternary compound has been observed.No solubility of Gd in compounds Co₃V,σCoV or CoV₃ was observed.There is no solubility of V in Co₇Gd₂ or Co₃Gd₄ observed at 773K.Co₅Gd was not found at 773K.It was confirmed that the compound Co₇Gd₁₂exists at 773K by XRD and DTA techniques.