Modifications of the crystal structure and magnetism of Nd2Ni2Sn upon hydrogenation

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10482391" target="_blank" >RIV/00216208:11320/24:10482391 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=NWUJktTcNB" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=NWUJktTcNB</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.est.2024.112739" target="_blank" >10.1016/j.est.2024.112739</a>

Result language
angličtina
Original language name
Modifications of the crystal structure and magnetism of Nd2Ni2Sn upon hydrogenation
Original language description
Intermetallic compounds R 2 Ni 2 M ( R = rare-earth metal, M = p-element) with the W 2 CoB 2 structure type (space group Immm ) form hydrides at low hydrogen pressures (below 1 bar H 2 ). The nature of the p-element is an important parameter affecting the activity towards hydrogen. Nd 2 Ni 2 Sn forms the hydride Nd 2 Ni 2 SnH 4.5 when heated to 393 K. Hydrogenation results in substantial anisotropic cell volume expansion ( Delta V / V = 15.7 %) and monoclinic distortion of the crystal lattice (space group C 2/ m ). Hydrogen can occupy sites inside three different Nd - Ni tetrahedra. Partial spontaneous hydrogen desorption leaves one of the tetrahedral sites vacant and the monoclinic distortion is removed. Magnetic exchange interactions are weakened upon hydrogenation, and the magnetic ordering temperature drops from 21 K in Nd 2 Ni 2 Sn to 5 K in its hydride. The variations in magnetism can be explained in terms of changes of the closest environment of the metal atoms, as well as by the usual decrease of the concentration of conduction electrons affecting the RKKY exchange interaction.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
<a href="/en/project/LM2023065" target="_blank" >LM2023065: Material growth and measurement laboratory</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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