Isothermal section of Gd-Sm-Co ternary system at 773 K

• Published in: Journal of rare earths 2013-04, Vol.31 (4), p.415-419
• Main Author: 朱其明 粱建烈 姚青荣 邓健秋 蒙洁丽 黄加高 庄应烘
• Format: Article
• Language: English
• Subjects: continuous series of solid solution; Diffraction; Gd-Sm-Co system; Phase diagrams; Rare earth metals; rare earths; Scanning electron microscopy; SmCo5; Solid solubility; Solid solutions; ternary phase diagram; Ternary systems; X-ray diffraction; X-射线粉末衍射; 三元化合物; 三元系统; 光学显微镜; 扫描电子显微镜; 等温截面; 连续固溶体
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(12)60297-X

The isothermal section of the phase diagram of the Gd-Sm-Co ternary system at 773 K was investigated by X-ray powder diffraction （XRD）, differential thermal analysis （DTA）, optical microscopy and scanning electron microscopy （SEM） techniques. The result shows that the isothermal section consists of 12 single-phase regions, 16 two-phase regions and 5 three-phase regions. Five pairs of corresponding compounds of Gd-Co and Sin-Co systems, i.e., Gd2Co17 and Sm2Co~7, Gd2Co7 and Sm2Co7, GdCo3 and SmC03, GdCo： and SmCo：, Gd3Co and Sm3Co form continuous series of solid solutions. The maximum solid solubility of Sm in Gd4Co3 arid Gdl2Co7 were about 7.2 at.% and 47.8 at.% Sm, respectively. The maximum solid solubility of Gd in Sm5Col9 and SmsCo2 were about 4.7 at.% and 7.6 at.% Gd, respectively. The binary compounds Sm9Co4, GdCos and SmCo5 were not observed at 773 K. No ternary compound was found.