Phase Relationships In The Dy-Co-Sn System At 773K

The isothermal section of the phase diagram of the Dy-Co-Sn (Sn≤66.7at.%) ternary system at 773 K was investigated by X-ray powder diffraction (XRD), differential thermal analysis (DTA), optical microscopy and scanning electron microscopy (SEM) techniques. The existence of eight ternary compounds has been confirmed, except for DyCo₃Sn and Dy₄CoSn₈. A new ternary compound Dy₃Co₄Sn₁₀ (Space group: F23, a=l.3574nm) was found. The results show that this section consists of 22 single-phase regions, 46 two-phase regions and 25 three-phase regions. None of these phases in this system revealed a remarkable homogeneity range at 773 K.