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Article Dans Une Revue Intermetallics Année : 2017

Nd2Ni2MgH8 hydride: Synthesis, structure and magnetic properties

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Résumé

Hydrogen interaction with intermetallic compound Nd2Ni2Mg crystallizing in the tetragonal Mo2FeB2 type of structure leads to the formation of hydride/deuteride containing 7.4-8 H(D)/f.u. Hydrogen absorption is accompanied by a monoclinic deformation of the unit cell with the crystal structure data refined from Synchrotron XRD (Sp. gr. P2(1)/c; a = 11.60733(5) angstrom; b = 7.66057(3) angstrom; c = 11.78743(5) angstrom, beta = 92.4126(4)degrees, V = 1047.194(8) angstrom(3)) and high resolution powder XRD data. The formed interstitial hydride disproportionates during heating forming NdH2. Nd2Ni2Mg is an antiferromagnet with the Neel temperature T-N approximate to 19 K. Presence of another magnetic phase transition at 14 K together with two metamagnetic transitions indicates a complicated magnetic phase diagram. The hydrogenation reduces T-N to 1.0 K. (C) 2017 Elsevier Ltd. All rights reserved.

Domaines

Chimie Matériaux
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Dates et versions

hal-03611611 , version 1 (17-03-2022)

Identifiants

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Silvie Maskova, Jean-Noel Chotard, Roman V. Denys, Khrystyna Miliyanchuk, Volodymyr Yartys, et al.. Nd2Ni2MgH8 hydride: Synthesis, structure and magnetic properties. Intermetallics, 2017, 87, pp.13-20. ⟨10.1016/j.intermet.2017.03.023⟩. ⟨hal-03611611⟩
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