Abstract
Abstract The variation in crystal structure with substitution of the Zr site of ZrM 2 (M 2 ≡ V 0.5 Ni 1.1 Mn 0.2 Fe 0.2 ) by Ti, Nb or Hf has been studied. The C14 and C15 Laves phases coexist for all alloys except TiM 2 (b.c.c.), Zr 0.25 Ti 0.75 M 2 (87% C14 and 13% b.c.c.), Zr 0.5 Ti 0.5 M 2 and NbM 2 (pure C14). The C15 phase cannot accommodate an M site M site bond distance of less than 2.46A. The phase stability under hydriding is confirmed. The pressure-composition isotherm measurements show that the multiphase alloys behave as a single phase. Also, the b.c.c. phase alloy TiM 2 can absorb hydrogen. For electrode performances, it is observed that the alloys with the C15 phase present a large reduction in discharge capacity when the discharge current is increased. For the alloys composed of only the C14 phase, the discharge capacity does not change significantly when the discharge current is increased.
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