Hydrogen induced phase transitions in YMn2

Hydrogen induced structural and magnetic transformations in the hexagonal Laves phase ErMn2

“…Another interesting effect is in the clear distortions for the single-phase hydrides (x = 2; 3.5) accompanying the onset of magnetic order, not visible for the cubic hydrides besides of YMn 2 [1].…”

“…The hydriding was made using the standard technique described, e.g. in [1]. To achieve phase equilibrium, all the samples were annealed at 180 • C for a few hours.…”

“…Recently, very interesting transformations induced by hydrogen were observed in the cubic C15 (Fd3m space group) Laves phase type compounds of yttrium and rare earths with manganese, namely YMn 2 H x [1], DyMn 2 H x [2], TbMn 2 H x [3] and GdMn 2 H x [4]. Hydrogen atoms are located there in the A2B2 interstitial sites.…”

Structural and Magnetic Properties of Low D Content YMn2 Deuteride

“…However, since these lines were still intense at high angle, they could not be attributed only to magnetic e!ect and were therefore related to coexistence between magnetic and deuterium ordering. The temperature dependence of the YMn D compound was found to be rather complex but our recent study (11) Below the magnetic transition temperature, it is important to separate magnetic contribution from deuterium ordering. For this purpose neutron di!raction is a wellappropriate tool, which can be used either for the localization of deuterium in deuterides or for the determination of magnetic structure.…”

Synthesis of Single-Phase YMn2D2 Studied by in situ Neutron Diffraction

“…Since hydrogen absorption in YMn leads to a large volume increase and therefore to an increase in Mn}Mn distances, it can be considered as a negative chemical pressure e!ect that induces interesting changes in magnetic properties. To study the evolution of the magnetic properties as a function of H content and to determine the YMn }H phase diagram (5) it is necessary to prepare single-phase YMn H V hydrides. However, hydrogen absorption at room temperature leads to a mixture of several phases with di!erent hydrogen contents.…”