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Title: Hydriding and electrical resistivity properties of MmTM3-hydrogen (TM = Fe, Co and Ni) system
Authors: Mohana Reddy, A.L.
Srinivas, G.
Ramaprabhu, S.
Keywords: Adsorption isotherms
Electric resistance
Mathematical models
Reaction kinetics
Absorption kinetics
PC isotherms
Issue Date: 2007
Citation: International Journal of Hydrogen Energy, 32(15 SPEC. ISS.), 3356-3362
Abstract: Hydrogen absorption pressure-composition (PC) isotherms and kinetics of rhombohedral MmTM3 (TM = Ni, Fe and Co) alloys have been carried out using Sieverts type apparatus. The variations in plateau pressure, hydride stability and kinetics upon partial substitution of Fe or Co for Ni in MmNi3 have been discussed. The absorption kinetics have been analyzed based on the Johnson-Mehl-Avrami (JMA) model. The reaction order and rate constants have been determined from the fit of the JMA model to the experimental data. The existence of different hydride phases and the hydriding reaction process in the different phase regions have been identified and explained. Further, the temperature dependent electrical resistivity of alloys and their hydrides have been studied and the variations in the resistivity with hydrogen concentration have been discussed. � 2007 International Association for Hydrogen Energy.
ISSN: 3603199
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