Structural and magnetic properties of the ternary compounds Gd₂Sc₃X₄ with X = Si and Ge

Etienne Gaudin (1) , Bernard Chevalier (1)

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

X-ray diffraction on single crystal performed on Gd₂Sc₃Si₄ reveals that this ternary silicide crystallizes as Gd₂Sc₃Ge₄ in the orthorhombic Ce₂Sc₃Si₄-type with a small deficiency in gadolinium leading to the formula Gd_1.88(1)Sc₃Si₄. The structure is formed by [Gd₂Sc₃Si₄] slabs with Si-Si interslab covalent bonds. The investigation of the Gd₂Sc₃Si₄ and Gd₂Sc₃Ge₄ compounds by magnetization, electrical resistivity and specific heat measurements reveals their antiferromagnetic behaviors; Gd₂Sc₃Si₅ having a Néel temperature (48-52 K) higher than that observed (22-23 K) for Gd₂Sc₃Ge₄.

Mots clés: Ternary compounds; X-ray diffraction; Antiferromagnets

Domaines: Matériaux; Cristallographie; Chimie inorganique

Etienne Gaudin, Bernard Chevalier. Structural and magnetic properties of the ternary compounds Gd₂Sc₃X₄ with X = Si and Ge. Journal of Alloys and Compounds, 2011, 509 (20), pp.5952-5957. ⟨10.1016/j.jallcom.2011.03.023⟩. ⟨hal-00589383⟩