The 500 °C isothermal section of the Gd-Tb-Co ternary system

The isothermal section of the phase diagram of the Gd-Tb-Co ternary system at 500 °C was investigated by X-ray powder diffraction, differential thermal analysis and metallographic analysis techniques. In this isothermal section, there are nine single-phase regions, eight two-phase regions and none three-phase region. No ternary compound was found. The compounds Gd2Co17 and Tb2Co17, Gd2Co7 and Tb2Co7, GdCo3 and TbCo3, GdCo2 and TbCo2, Gd4Co3 and Tb4Co3, Gd12Co7 and Tb12Co7, Gd3Co and Tb3Co, Gd and Tb form a continuous series of solid solutions. In addition, we experimentally determined the vertical section of pseudobinary system and the Curie temperature of Gd1−xTbxCo2 (x from 0 to 1) series alloys.