Magnetism and hydrogen absorption in UNiZn

UNiZn is the first Zn containing UTX ternary with the ZrNiAl structure type. Zn is smaller than other p-metals (Al, Ga, Sn, In) forming this type of structure. This compound can be seen as analogous to UNiAl and UNiGa, but the small X ligand leads to a non-magnetic ground state with moderately enhan...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 646; pp. 885 - 892
Main Authors Mašková, S., Daniš, S., Miliyanchuk, K., Stelmakhovych, O., Vondráčková, B., Kolomiets, A.V., Havela, L.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.10.2015
Subjects
Hydrogen
Magnetism
Metal hydrides
Uranium
Metal hydrides
Magnetism
Uranium
Hydrogen
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Summary:UNiZn is the first Zn containing UTX ternary with the ZrNiAl structure type. Zn is smaller than other p-metals (Al, Ga, Sn, In) forming this type of structure. This compound can be seen as analogous to UNiAl and UNiGa, but the small X ligand leads to a non-magnetic ground state with moderately enhanced Sommerfeld coefficient γ = 100 mJ/mol K2. H absorption leads to analogous effects (amount of hydrogen absorbed, crystal structure changed) as in UNiAlH2.3, in which the ordering temperature increases. UNiZnH2.3 exhibits antiferromagnetic order below the Néel temperature TN = 55 K. •New hexagonal Zn-compound with 111 stoichiometry was found.•UNiZn does not show any magnetic order down to 2 K.•Hydrogen absorption in UNiZn is very sensitive to the temperature.•High-T absorption leads to the reversible decomposition of the compound.•Low-T hydride exhibits antiferromagnetic order below TN = 55 K.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2015.05.234