CHARACTERISTICS OF THE STOICHIOMETRIC AND NONSTOICHIOMETRIC LAVES PHASE ALLOYS AND THEIR HYDRIDE ELECTRODES

The pressure-composition isotherms, lattice parameters and electrode p roperties of the stoichiometric and non-stoichiometric C14 Laves phase alloys with various compositions were studied in this work. The flatn ess of the plateau pressure of the stoichiometric alloys with vanadium was inferior; however the flatness of the non-stoichiometric alloys o n adding manganese improved for the Ti1-xZrxFe0.15Mn9.21+yV0.64Ni1.0 ( x = 0.2-0.4, Y = 0-0.4) system. The changes in the hydrogen plateau pr essure and flatness of the plateau pressure were attributed to the geo metric factor and affinity of environmental elements of the tetrahedra l interstices hydrogen occupation. The electrode properties of all all oys studied were dependent on the hydrogen plateau pressure and flatne ss of the plateau pressure of the alloy.