MAHON, Tadhg; GAUDIN, Etienne; NASSIF, V.; TENCÉ, Sophie

doi:10.1016/j.jallcom.2020.156105

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MAHON, Tadhg
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

GAUDIN, Etienne
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

NASSIF, V.
CRG & Grands instruments [NEEL - CRG]
Institut Laue-Langevin [ILL]

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Journal of Alloys and Compounds. 2020-12, vol. 844, p. 156105

Elsevier

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We report the synthesis of the first carbide-hydride phase obtained in the family of equiatomic intermetallics RTX (R = rare earth, T = transition metal, X = p-block element) by insertion of light elements. We prepared the NdScSiC0.5H0.2 compound by solid-gas reaction, by exposing the carbide NdScSiC0.5 to 40 bars of H2 gas at 450 °C. It crystallizes in the La2Fe2Se2O3-type structure with H and C atoms occupying Nd4 tetrahedral and Nd2Sc4 octahedral interstices, respectively. The H site is only partly filled owing to the presence of Nd–C covalent bonding that prevents the formation of Nd–H bonding through antagonist effect. The carbide-hydride was characterized through magnetic measurements, specific heat and powder neutron diffraction. Remarkably, hydrogenation of the carbide provokes a quite drastic effect on the magnetic properties by changing the ground state from a ferromagnetic (TC∼70 K) to an antiferromagnetic one (TN = 10 K). The magnetic structure of NdScSiC0.5H0.2 consists of double layers of ferromagnetic Nd moments aligned along the c-axis and coupled antiferromagnetically along this axis. This magnetic structure results in a field-induced metamagnetic behaviour as pointed out by magnetisation isotherms.< Réduire

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Carbide-hydride

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Structural and magnetic properties of the interstitial carbide-hydride NdScSiC0.5H0.2

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