Impact of hydrogen absorption on crystal structure and magnetic properties of RE.sub.2./sub.T.sub.2./sub.X compounds

0449210 - FZÚ 2016 RIV NL eng J - Článek v odborném periodiku
Mašková, S. - Kolomiets, A. - Havela, L. - Andreev, Alexander V. - Svoboda, P.
Impact of hydrogen absorption on crystal structure and magnetic properties of RE₂T₂X compounds.
Journal of Alloys and Compounds. Roč. 645, Suppl.1 (2015), S76-S79. ISSN 0925-8388. E-ISSN 1873-4669.
[International Symposium on Metal-Hydrogen Systems (MH14). Salford, 20.07.2014-25.07.2014]
Institucionální podpora: RVO:68378271
Klíčová slova: rare earths * hydrogen * metal hydrides * magnetism
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 3.014, rok: 2015

RE2Pd2X compounds (RE = rare earth, X = In, Sn) absorb, depending on the RE element, different amounts of hydrogen. The parent compounds RE2T2In show the linear decrease of both lattice parameters and the unit cell volume with the increasing atomic number of RE due to the lanthanide contraction. All the compounds absorb at least 2 H/f; the tetragonal structure is merely expanded. The expansion is anisotropic, and for RE = Tb, Dy, Ho, and Er the lattice even contracts along the a-axis, whereas c-parameter still weakly increases. A higher H concentration can be achieved in the compounds with light rare earths (La, Nd, both for In and Sn), which then become amorphous. The magnetic ordering temperatures of all studied RE2T2In compounds are dramatically reduced by the hydrogenation, typically to the temperature range below 1.8 K.
Trvalý link: http://hdl.handle.net/11104/0250798