The isothermal section of the Gd–Fe–Ge ternary system at 773 K

The isothermal section of the phase diagram of the Gd–Fe–Ge ternary system at 773 K was investigated by X-ray powder diffraction (XRD), differential thermal analysis (DTA) and optical microscopy. The existences of 14 binary compounds, GdFe2, GdFe3, Gd6Fe23, Gd2Fe17, Fe3Ge, Fe5Ge3, Fe6Ge5, FeGe, FeGe2, Gd5Ge3, Gd5Ge4, GdGe, Gd2Ge3, Gd3Ge5, and four ternary compounds GdFe2Ge2, GdFe6Ge6, Gd2FeGe4, Gd117Fe52Ge112, were confirmed. This section consists of 21 single-phase regions, 43 two-phase regions, and 23 three-phase regions.