CHEVALIER, Bernard; HERMES, Wilfried; HEYING, Birgit; RODEWALD, Ute Ch.; HAMMERSCHMIDT, Adrienne; MATAR, Samir F.; GAUDIN, Etienne; PÖTTGEN, Rainer

doi:10.1021/cm101290f

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CHEVALIER, Bernard
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

HERMES, Wilfried
Institut für Anorganische und Analytische Chemie

HEYING, Birgit
Institut für Anorganische und Analytische Chemie

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Chemistry of Materials. 2010, vol. 22, n° 17, p. 5013-5021

American Chemical Society

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The La2Sb type silicides and germanides REScSi and REScGe (RE = La, Ce) were synthesized from the elements by arc-melting and subsequent annealing at 1170 K. The structures of LaScSi and LaScGe were refined on the basis of single-crystal X-ray diffraction data. The structures consist of a stacking of two-dimensional [ScSi] networks with ScSi4/4 rectangles, which are separated by rare earth atoms, which leave RE4/4 tetrahedral voids. The latter can be completely filled by hydrogenation leading to the quaternary hydrides REScSiH and REScGeH (RE = La, Ce). Hydrogenation is accompanied by an anisotropic unit cell expansion, i.e., a decrease in the a lattice parameter and a strong increase in c. The H-insertion into the compounds based on cerium induces for both a quasi-2D structure, a strong decrease of their antiferromagnetic ordering; for instance TN decreases from 26 to 3.0 K in the sequence CeScSi → CeScSiH and the occurrence of the influence of the Kondo effect evidenced by electrical resistivity and specific heat measurements. The electronic structure calculation applied to CeScSi and its hydride reveals strong Ce−H bonding influencing the magnetic properties of CeScSiH.< Réduire

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New hydrides REScSiH and REScGeH (RE = La, Ce) : structure, magnetism, and chemical bonding

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