Please use this identifier to cite or link to this item: http://hdl.handle.net/11717/6157
Title: Investigations of hydrogen storage properties in certain Zr-based AB2 alloys
Authors: Mary Philipose, S.
Mani, N.
Kesavan, T.R.
Ramaprabhu, S.
Keywords: Desorption
Enthalpy
Entropy
Isotherms
Lattice constants
Zirconium alloys
Hydrogen desorption isotherms
Hydrogen
Issue Date: 2002
Citation: International Journal of Hydrogen Energy, 27(4), 419-424
Abstract: The hydrogen storage properties of ZrMnFe0.45Co0.45V0.1 and ZrMn0.9V0.1Fe0.5Co0.5, which are of C14 hexagonal structure, are studied in the ranges of 0.3 � P (bar) � 30 and 30 � T (�C) � 100. The partial substitution of V at the Mn site or at the Fe/Co site in ZrMnFe0.5Co0.5 leads to the expansion of the lattice, the percentage of volume expansion being larger for ZrMnFe0.45Co0.45V0.1 than for ZrMn0.9V0.1Fe0.5Co0.5. The pressure-composition (P-C) isotherms of ZrMnFe0.45Co0.45V0.1 and ZrMn0.9V0.1Fe0.5Co0.5 show the existence of �, (� + ?) and ? regions. The hydrogen desorption isotherms of the alloys show that the hysteresis is small. The plateau pressures of ZrMnFe0.45Co0.45V0.1-H in the temperature ranges investigated, are lower than those in ZrMn0.9V0.1Fe0.5Co0.5-H, due to the larger size of the tetrahedral interstitial sites in the former alloy. The dependence of the relative partial molar enthalpy of dissolved hydrogen (?HH) and the partial molar entropy of dissolved hydrogen (?SH) in ZrMnFe0.45Co0.45V0.1-H and ZrMn0.9V0.1Fe0.5Co0.5-H on the hydrogen concentration show the presence of �, (� + ?) and ? phases. The chemical potential of dissolved hydrogen (??H) in ZrMnFe0.45Co0.45V0.1-H is larger than that in ZrMn0.9V0.1Fe0.5Co0.5-H due to the larger size of the tetrahedral interstitial sites in the former alloy. ? 2002 International Association for Hydrogen Energy. Published by Elsevier Science Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/S0360-3199(01)00128-8
http://hdl.handle.net/11717/6157
ISSN: 3603199
Appears in Collections:Articles

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.