Abstract
Using scanning electron microscopy and x-ray phase analysis techniques, it is shown that the C14-type Laves phase with a wide homogeneity reaching the AB2.3 stoichiometry is the main phase in the Zr0.5Ti0.5NiyV0.5Mn x alloys, where y = 0.8–1.4 and x = 0.1–1.7. With the increase in the nickel and manganese contents and in the stoichiometric ratio B/A, the hydrogen capacity decreases from 2 to 1.6 wt %, the equilibrium pressure of hydride phases increases, and the hydrides become less stable. The highest discharge capacity is reached for stoichiometric ratios AB1.7–2.3, where the maximum discharge capacity at a discharge current density of 100 mA/g is 300 (mA h)/g. Alloys that contain ferrovanadium in place of vanadium are also considered.
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Original Russian Text © T.A. Zotov, V.N. Verbetskii, T.Ya. Safonova, A.V. Garshev, O.A. Petrii, 2007, published in Elektrokhimiya, 2007, Vol. 43, No. 3, pp. 373–381.
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Zotov, T.A., Verbetskii, V.N., Safonova, T.Y. et al. Hydrogen sorption and electrochemical properties of alloys: Systems Zr-Ti-Ni-V-Mn with laves phase structures. Russ J Electrochem 43, 355–363 (2007). https://doi.org/10.1134/S1023193507030147
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DOI: https://doi.org/10.1134/S1023193507030147