Abstract

The phase relations in the Au–Mn–Sb 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 phase relations are relatively complex in regions which involve the numerous binary gold–manganese phases. The only genuine ternary phase, AuMnSb, has a very narrow composition range around Au 35Mn 30Sb 35 and is stable up to 575±5 °C, where it decomposes peritectically. The AuMnSb phase is ferromagnetic with a Curie temperature of 135±10 K. The solid-solution phase AuMnSn 1− x Sb x exhibits ferromagnetic properties throughout the entire homogeneity range with the Curie temperature ranging between 625±100 and 135±10 K.

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