Isothermal cross-sections of Gd-Fe-Ge system at 800 °C and magnetic properties of Gd117Fe52Ge112 compound

M. Jemmali (1) , S. Walha (1) , R. Ben Hassen (2) , H. Noel (3)

1 FSS - Faculté des Sciences de Sfax
2 ISSBAT - Unité de Recherche de Chimie des Matériaux
3 ISCR - Institut des Sciences Chimiques de Rennes

The isothermal section of the phase diagram of the Gd-Fe-Ge ternary system at 800 °C was investigated by X-ray powder diffraction and scanning electron microscope-energy dispersive X-ray spectroscopy. Three intermediate solid solutions have been identified or confirmed: one lacunaire GdFexGe2 (CeNiSi2-type of structure space group P6/mmm) and two by substitition GdFe4-xGex (AlB4-type of structure space group I4/mmm) and GdFe12-xGex (YCo6Ge6-type of structure space group P6/mmm) and one ternary compound Gd117Fe52Ge112 (Tb117Fe52Ge112-type of structure space group Fm-3m). The magnetic properties of Gd117Fe52Ge112 compound is ferromanetic at 89 K have been studied. The 800 °C phase diagram of this system consists of 20 three-phases regions.

Domaines: Chimie

M. Jemmali, S. Walha, R. Ben Hassen, H. Noel. Isothermal cross-sections of Gd-Fe-Ge system at 800 °C and magnetic properties of Gd117Fe52Ge112 compound. Chemistry - An Asian Journal, 2016, 28 (6), pp.1330--1334. ⟨10.14233/ajchem.2016.19688⟩. ⟨hal-01341579⟩