in hydrogen solid-gas reaction at 300 K and I bar, the hydrogen content for Ti(3.87)Ni(1.73)Fe(0.7)O(x) (0.2 <= x <= 0.8) alloys was in range 1.93-0.05 (Cwt.H,%), and discharge capacity of 360-235 A h/kg was achieved accordingly. The Delta H(H2) and Delta S(H2) values of -32.29 kJ mol(-1) and -111.04 J mol(-1) K(-1), respectively, for Ti(3.87)Ni(1.73)Fe(0.7)O(0.5) alloy were obtained using experimental PCT relations, where hysteresis effect was only slightly visible. The half-cell potentials (vs. Hg/HgO) of metal hydride (MH) electrodes based on Ti(3.87)Ni(1.73)Fe(0.7)O(x) (0.2 <= x <= 0.8) alloys were calculated. Ti(3.87)Ni(1.73)Fe(0.7)O(x) (0.2 <= x <= 0.5) alloys might meet the requirements of general criteria for MH electrode, but only with the exception of good corrosion resistance. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.