- : Hydrogenation studies on NdScSi and NdScGe ( View accepted manuscriptPDF, 785 KB)
- : Hydrogenation studies on NdScSi and NdScGe (Opens in a new window)Get@NRC
|DOI||Resolve DOI: http://doi.org/10.1016/j.jssc.2016.02.017|
|Author||Search for: Tencé, Sophie; Search for: Mahon, Tadhg; Search for: Gaudin, Etienne; Search for: Chevalier, Bernard; Search for: Bobet, Jean-Louis; Search for: Flacau, Roxana; Search for: Heying, Birgit; Search for: Rodewald, Ute Ch.; Search for: Pöttgen, Rainer|
|Journal title||Journal of Solid State Chemistry|
|Subject||Silicides; Germanides; Crystal chemistry; Hydrogenation reactions; Neutron diffraction; Magnetic properties|
|Abstract||CDATA[NdScSi and NdScGe were synthesized from the elements via arc-melting and subsequent annealing. Their ordered La₂Sb type structures, with space group I4/mmm, were refined from single crystal X-ray diffractometer data: a=428.94(6) and b=1570.5(3) pm, wR2=0.0395, 309 F² values for NdScSi and a=431.2(1) and c=1581.3(5) pm, wR2=0.1220, 227 F² values for NdScGe, with 11 variables per refinement.
Hydrogen insertion was performed on both Nd-based intermetallics by solid/gas reaction. Hydrogen uptake keeps the pristine compound space group but yields an anisotropic expansion of the unit cell with a large increase of c (≈+7%) and a slight decrease of a (≈−1.7%) parameters. Hydrogen absorption at 350 °C and under 5 bar of H₂ pressure shows that the hydride NdScSiH₁.₄₈₍₅₎ is formed. An in-situ neutron diffraction study during the deuteration of NdScSi reveals for the first time in a CeScSi-type compound, the possibility to fill two interstitial sites with deuterium atoms, leading to the composition NdScSiD1.5 for the deuteride adopting then the La₂Fe₂Se₂O₃-type structure.
From magnetization measurements, we evidence that hydrogenation strongly reduces the Curie temperature of NdScSi (TC=175 K) and NdScGe (TC=194 K) since NdScSiH₁.₅ and NdScGeHₓ undergo a magnetic transition at 4 K and around 2 K, respectively.|
|Affiliation||Security and Disruptive Technologies; National Research Council Canada|
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