The ternary system Au–Mn–Sn

The phase relations in the Au–Mn–Sn system have been studied by powder X-ray diffraction, metallography, electron microprobe analysis, and thermal analysis. The condensed phases occurring, tie-lines and tie-triangles are presented for an isothermal section of the phase diagram at 400°C. At this temperature the solid solubility of the third component in the binary phases is generally limited to a few percent. The numerous phases in the binary Au–Mn system, are reflected in relatively complex phase relations in certain parts of the Au–Mn–Sn system. The only genuine ternary phase, AuMnSn, has a narrow composition range between Au35Mn31Sn34 and Au33Mn35Sn32 and is stable up to ca. 470°C were it decomposes peritectically.