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Hydriding–dehydriding characteristics of NdNi5and effects of Sn-substitution

Journal of Alloys and Compounds
Publication Date
DOI: 10.1016/s0925-8388(99)00551-4
  • Ndni5− Ssnsalloys
  • Pct Relation
  • Hydriding–Dehydriding Kinetics
  • X-Ray Diffraction
  • Sem Observation


Abstract The pressure–composition–temperature relations and the reaction kinetics for the NdNi 5− s Sn s ( s=0, 0.1, 0.2, 0.4)–H 2 system are measured at temperatures between 253 and 293 K. The PCT for NdNi 5, which presents two well-separated plateau regions at rather high pressures, is strongly altered by the Sn-substitution. Namely, both plateau pressures are continually reduced with increasing substitution and the relative separation is reduced to cause a nearly single sloped plateau without reducing the maximum hydrogen capacity appreciably (H/M∼1.0). Furthermore, the hydriding and dehydriding kinetics are substantially improved by the Sn-substitution. The promotion of the reaction kinetics is related with increased tendency toward pulverization during hydriding–dehydriding cycles. X-ray diffraction study suggests that NdNi 5 is structurally stabilized by the Sn-substitution against decomposition during the H–D cycles. In conclusion, NdNi 4.8Sn 0.2 appears to be favorable for use as a hydrogen storage alloy in the above temperature range.

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