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Article Dans Une Revue Journal of Alloys and Compounds Année : 2006

Structural chemistry, magnetism and electrical properties of binary Gd silicides and Ho3Si4

Résumé

Binary gadolinium silicides were thoroughly investigated with respect to their structural chemistry and physical properties as well. Formation and structure types of all known binary phases were confirmed. In addition, a new binary compound Gd3Si4 belonging to the Ho3Si4 type was obtained through a sluggish peritectoidal reaction between the binary phases GdSi and GdSi2−x. In addition, the limits of the homogeneity range of the GdSi2−x phase (AlB2 type) were also confirmed. Moreover, the crystal structures of Gd5Si3 (Mn5Si3 type) and GdSi (FeB type) were determined from X-ray single crystal data. The magnetic and electrical properties for most of the binary Gd-Si phases, encountered within this system, have been studied. The magnetic properties are characterised by the onset of magnetic ordering below 100 K. Gd5Si3 shows an antiferromagnetic transition at TN = 75 K, GdSi orders weakly ferromagnetically at TC = 78 K followed by an antiferromagnetic spin alignment at TN = 54 K, GdSi2−x reveals also two consecutive transitions at TN = 54 K and TC = 35 K and GdSi2 exhibits the same behaviour but at TN = 26 K and TC = 14 K. In addition, magnetic measurements were also performed for the binary silicide Ho3Si4 (antiferromagnetic behaviour, TN = 16 K), structurally related to Gd3Si4. The electrical resistivities for all silicides resemble the temperature dependence of metals, with characteristic changes of slope in the resistivity curves due to the reduced electron scattering in the magnetically ordered states.

Dates et versions

hal-00863112 , version 1 (18-09-2013)

Identifiants

Citer

Jérome Roger, Volodymyr Babizhetskyy, Kurt Hiebl, Jean-François Halet, Roland Guérin. Structural chemistry, magnetism and electrical properties of binary Gd silicides and Ho3Si4. Journal of Alloys and Compounds, 2006, 407 (1-2), pp.25-35. ⟨10.1016/j.jallcom.2005.06.038⟩. ⟨hal-00863112⟩
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