Crystal structures and magnetic properties of the RFe1-xGe2 (R = Gd, Er) compounds

 

Chem. Met. Alloys 3 (2010) 126-131

 

Mosbah JEMMALI, Siwar WALHA, Henri NOËL, Rached BEN HASSEN

 

In the course of an investigation of solid solutions with RFe1-xGe2 (R = Gd, Er) stoichiometry we have isolated two new phases. Their compositions are GdFe0.37Ge2 and ErFe0.27Ge2, and they have been synthesized by arc melting of pure components and studied by means of X-ray diffraction, SEM analysis and magnetic measurements. They crystallize in the orthorhombic space group Cmcm, with defect CeNiSi2-type structures. Magnetic susceptibility measurements performed in the temperature range 2–300 K showed conventional Curie-Weiss paramagnetic behaviour for both compounds above 25 K. At low temperature, magnetic susceptibility data revealed magnetic phase transitions.

 

 

Perspective view of the structure and coordination polyhedra of the Fe atoms for GdFe0.37Ge2.

 

Keywords

Intermetallic compounds / Chemical synthesis / X-ray diffraction / Electron microscopy