Structural, thermodynamic, and electrochemical properties of TixZr1-x(VNiCrMnCOAl)2 C14 Laves phase alloys

Variations in structural, thermodynamic, and electrochemical properties due to partial replacement of Zr by Ti in stoichiometricTixZr1-x(VNiCrMnCoAl)2 AB2 alloys, have been studied. In particular, these properties are evaluated to determine the alloys' potential as a negative electrode material...

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Bibliographic Details
Published in:Journal of alloys and compounds 2008-09, Vol.464 (1-2), p.238-247
Main Authors: YOUNG, K, FETCENKO, M. A, LI, F, OUCHI, T
Format: Article
Language:English
Subjects:
Applied sciences
Chemical and electrochemical properties
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Materials and auxiliary equipments used in energy engineering
Metals. Metallurgy
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Summary:Variations in structural, thermodynamic, and electrochemical properties due to partial replacement of Zr by Ti in stoichiometricTixZr1-x(VNiCrMnCoAl)2 AB2 alloys, have been studied. In particular, these properties are evaluated to determine the alloys' potential as a negative electrode material for high energy density nickel metal hydride batteries. Alloys having an x value of from 0.49 to 0.61 are dominated by a C14 Laves phase crystal structure. As Ti-content increases, lattice constants a and c decrease non linearly, the absolute value of hydride heat of formation decreases, the total gas-phase storage capacity decreases and the high rate dischargeability increases. However, the electrochemical capacity remains relatively constant.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2007.09.096