Investigation of the phase occurrence and H sorption properties in the Y33.33Ni66.67Al (0 ≤ x ≤ 33.33) system - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Alloys and Compounds Année : 2021

Investigation of the phase occurrence and H sorption properties in the Y33.33Ni66.67Al (0 ≤ x ≤ 33.33) system

Résumé

The Y33.33Ni66.67-xAlx system has been investigated in the region 0 ≤ x ≤ 33.3. The alloys were synthesized by induction melting. Phase occurrence and structural properties were studied by X-Ray powder Diffraction (XRD). The Al solubility in each phase has been investigated by XRD and Electron Probe Micro-Analysis (EPMA). The hydrogenation properties were characterized by pressure-composition isotherm measurements and kinetic curves at 473 K. For x = 0, the binary Y33.33Ni66.67 alloy crystallizes in the cubic superstructure with F4 ̅ 3m space group and ordered Y vacancies. For 1.67 ≤ x ≤ 8.33, the alloys contain mainly Y(Ni, Al)2 and Y(Ni, Al)3 pseudobinary phases; while for 16.67 ≤ x ≤ 33.33 they are mainly formed by ternary line compounds Y3Ni6Al2, Y2Ni2Al and YNiAl. Contrary to the binary Y33.33Ni66.67, Y(Ni, Al)2 pseudo-binary compounds crystalize in C15 phase (space group Fd3m) with disordered Y vacancies. The solubility limit of Al in the C15 YNi2-yAly phase is y = 0.11 (i.e., x = 3.67). The Y(Ni, Al)3 phase changes from rhombohedral (PuNi3-type, R3m) to hexagonal (CeNi3-type, P63/mmc) structure for x increasing from 5.00 to 6.67. Upon hydrogenation, the disproportion of C15 Y(Ni, Al)2 and losses of crystallinity of YNi and Y2Ni2Al are the main reasons causing capacity decay of Y33.33Ni66.67-xAlx (0 ≤ x ≤ 33.33) alloys upon cycling.

Domaines

Matériaux
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Dates et versions

hal-03339229 , version 1 (09-09-2021)

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Hao Shen, Valérie Paul-Boncour, Michel Latroche, Fermin Cuevas, Ping Li, et al.. Investigation of the phase occurrence and H sorption properties in the Y33.33Ni66.67Al (0 ≤ x ≤ 33.33) system. Journal of Alloys and Compounds, 2021, 888, pp.161375. ⟨10.1016/j.jallcom.2021.161375⟩. ⟨hal-03339229⟩
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