NdNiMg5, a New Magnesium-Rich Phase with an Unusual Structural Type.

Bassem Ourane (1, 2) , Etienne Gaudin (1) , Ridha Zouari (2) , Samuel Couillaud (1) , Jean-Louis Bobet (1)

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

The new intermetallic NdNiMg5 was discovered during the study of the Mg-rich part of the Mg-Nd-Ni system. It was synthetized by melting of the constituent elements in a sealed tantalum tube with subsequent annealing. Its structure was determined by X-ray diffraction on a single crystal. Crystal data: orthorhombic system, Cmcm, Z = 4, a = 4.4799(2) Å, b = 9.9827(3) Å, c = 13.7854(10) Å, dcalc = 3.49 g*cm(-3). Its structure is made of infinite layers of Mg atoms that form blocks stacked along the c axis. These blocks, with a close-packed array of Mg atoms, are separated by infinite NiNd layers and connected through short Mg-Mg bonds. In the NiNd layer, the Ni and Nd atoms form an ordered graphite-type network. Antiferromagnetic ordering is observed with TN = 12 K, and the effective magnetic moment μeff is equal to 3.89(1) μB.

Mots clés: Intermetallics; Inorganic compounds; Crystallography

Domaines: Matériaux; Chimie inorganique

Bassem Ourane, Etienne Gaudin, Ridha Zouari, Samuel Couillaud, Jean-Louis Bobet. NdNiMg5, a New Magnesium-Rich Phase with an Unusual Structural Type.. Inorganic Chemistry, 2013, 52 (23), pp.13289-13291. ⟨10.1021/ic401911g⟩. ⟨hal-00913633⟩