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Scientific article
English

Interaction of hydrogen with RECu2 and RE(Cu,Ni)2 intermetallic compounds (RE=Y, Pr, Dy, Ho)

Published inJournal of alloys and compounds, vol. 358, no. 1-2, p. 146-151
Publication date2003
Abstract

Hydrogenation of RECu2 (RE=Dy, Ho, Y) at room temperature and pressures of 100–1500-bar H2 has not resulted in the formation of ternary hydrides. The interaction of hydrogen with Pr(Cu1−xNix)2 (x=0, 0.1, 0.17, 0.25, 0.32) at room temperature and pressure of 25 bar resulted in the formation of Pr(Cu1−xNix)2H∼3 hydrides. It was found that the PrCu2H3 and Pr(Cu0.9Ni0.1)2H2.9 hydrides are poorly crystallized, but that an increase of the Ni-content leads to improved crystallinity of the hydrides. The hydrides Pr(Cu0.75Ni0.25)2H∼3 and Pr(Cu0.68Ni0.32)2H∼3 preserve, shortly after the hydrogen absorption, the CeCu2 type structure of their metallic matrix with a hydrogen induced volume expansion up to 28% compared to the parent compound. During long-term exposure in the air they undergo a structural transformation from the orthorhombic CeCu2 to the hexagonal Fe2P type with a hydrogen induced volume expansion up to 16.6% compared to the parent compound.

Keywords
  • Rare earth compounds
  • Transition metal compounds
  • Hydrogen absorbing materials
  • Metal hydrides
  • Crystal structure
Research group
Citation (ISO format)
ZAVALIY, I. Yu. et al. Interaction of hydrogen with RECu<sub>2</sub> and RE(Cu,Ni)<sub>2</sub> intermetallic compounds (RE=Y, Pr, Dy, Ho). In: Journal of alloys and compounds, 2003, vol. 358, n° 1-2, p. 146–151. doi: 10.1016/S0925-8388(03)00067-7
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ISSN of the journal0925-8388
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