The isothermal section at 600 ∘C of the ternary Pr–Au–Sn phase diagram

The ternary Pr–Au–Sn isothermal section at 600 ∘C has been investigated by X-ray diffraction, optical and scanning electron microscopy and electron probe microanalysis. The ten new ternary phases τ1 PrAu2−xSnx, τ2 Pr61Au25Sn14, τ3 PrAu6−xSnx, τ4 Pr4Au11Sn5, τ5 PrAu2Sn, τ6 Pr30Au40+xSn30−x, τ8 Pr5AuSn3, τ9 Pr3Au6Sn5, τ10 Pr2Au3Sn4, τ11 Pr2Au3Sn6 have been identified and the ternary equiatomic τ 7 PrAuSn compound confirmed. The structures of some of these phases have been investigated by powder diffraction methods, and the results have been reported. The τ3 PrAu6−xSnx solid solution at x = 1.77 and the τ9 Pr3Au6Sn5 ternary compound have been examined by single crystal method, resulting to be cubic cI208-38.2, space group Im 3 ̄ , and orthorhombic oP28, space group Pmmn, respectively. The tie-triangles of the ternary section have been determined and their trend has been discussed. The results obtained have been compared to the Ce–Au–Sn ternary section at 750 ∘C.