Structural, magnetic and electrical properties of the ternary silicide Gd6Co1.67Si3 derived from the hexagonal Ho4Co3.07 (or Ho6Co4.61) type structure

Etienne Gaudin (1) , François Weill (1) , Bernard Chevalier (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

The title compound was discovered as an impurity phase in many GdCoSi samples. It crystallizes in the hexagonal space group P63/m with a = 11.7787(5) and c = 4.1640(2) A° . Using X-ray powder diffraction, an ordered distribution between Co and Si was found but one site is not fully occupied by Co for steric reasons. Magnetization measurements reveal that Gd6Co1.67Si3 exhibits a ferromagnetic transition at TC = 294(2) K, a Curie temperature similar to that reported for pure gadolinium. This magnetic ordering has been confirmed by electrical resistivity investigations.

Mots clés: Intermetallics; Rare-earth; Electron microscopy; Crystal chemistry; Magnetic properties; Electrical resistance

Domaines: Matériaux; Chimie inorganique

Etienne Gaudin, François Weill, Bernard Chevalier. Structural, magnetic and electrical properties of the ternary silicide Gd6Co1.67Si3 derived from the hexagonal Ho4Co3.07 (or Ho6Co4.61) type structure. Zeitschrift fur Naturforschung B, 2006, 61 (7), pp.825-832. ⟨10.1515/znb-2006-0709⟩. ⟨hal-00084966⟩