Hydrogen-induced disproportionation of Zr2M (M=Fe, Co, Ni) and reproportionation

Hydrogenation of nanocrystalline Zr–Fe–H powder

“…The above results based on Mössbauer phase analysis do not confirm the hydrogen-induced disproportionation Zr 2 Fe and Fe 2 Zr phases to Zr 3 Fe described in [3]. We have observed that the magnetic phase Fe 2 Zr transformed in consequence of hydrogenation to pure ␣-Fe and nonmagnetic phases (Fe, Fe 3+ and Fe 2+ in ZrO 2 ).…”

“…Zr-based alloys and compounds are well known as materials for hydrogen storage. Hydrogenation of Zr-Fe alloys was described in [3]. It was shown that the ability of Zr-rich phases of absorbing of * Corresponding author.…”

In situ powder synchrotron and neutron diffraction study of Zr2Ni deuterides

“…The second stage took several hours to complete. The final products were suggested to be tetragonal ZrH 2 and Zr 7 Ni 10 based on the amount of absorbed hydrogen [15], however, the presence of Zr 7 Ni 10 was not possible to be confirmed with PXD. The present work identifies un- ambiguously the decomposition products as tetragonal ZrD 2 and Zr 7 Ni 10 (structure model taken from Ref.…”

“…At 873 K the decomposition was complete and no peaks from Zr 2 NiD x were any longer present. Hara et al reported a two-stage decomposition route for Zr 2 Ni when exposed to about 2 bar deuterium at 773 K [15]. The first stage was completed very quickly (∼1 min) with tetragonal ZrH 2 and ZrNiH 3 appearing as decomposition products.…”

Hydrogen storage behavior of ZrNi 70/30 and ZrNi 30/70 composites

“…Hydride induced disproportionation and reproportation of Zr-TM (TM = transition metals, Fe, Co, Ni) intermetallics have been studied by means of volumetric hydrogen absorption/desorption measurements [24] and the stability was found to be in the order of Zr 2 Ni > Zr 2 Co > Zr 2 Fe. The free energy of the ZrNi compound was reduced by mechanically milling the materials under different hydrogen partial pressures [25].…”