Modifications of the crystal structure and magnetism of Nd2Ni2Sn upon hydrogenation

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Modifications of the crystal structure and magnetism of Nd2Ni2Sn upon hydrogenation

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Modifications of the crystal structure and magnetism of Nd2Ni2Sn upon hydrogenation

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/LM2023065" target="_blank" >LM2023065: Laboratoř pro syntézu a měření materiálů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Energy Storage

ISSN

2352-152X

e-ISSN

2352-1538

Svazek periodika

97

Číslo periodika v rámci svazku

září

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

112739

Kód UT WoS článku

001266785300001

EID výsledku v databázi Scopus

2-s2.0-85197253782