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- W2382799421 abstract "As an important rare-earth type Laves phase compound,ScMn_2 alloy is endowed certain significance in the viewpoint of either theoretical or applicable investigation.In this study, the structures of ScMn_2 alloy and its hydride(deuteride) are characterized by XRD.The hydrogen activation properties,pressure-concentration-temperature(P-C-T) curves and absorption kinetic curves of ScMn_2 alloy are measured using Sieverts-type hydrogenator.The desorption kinetics of the passivated hydride are determined by TG-DSC.The results show that the hydride and deuteride of the alloy retain the C14 type Laves phase structure of the parent alloy,with the volume expansions of about 25%.ScMn_2 possesses outstanding activation properties and can react quickly with hydrogen (deuterium) at room temperature and atmospheric pressure.The hydrogen and deuterium storage capacities of 1 mol ScMn_2 are about 3.7 mol H and 3.6 mol D at 100 kPa and 298 K.ScMn_2 has low hysteresis critical temperature for absorption and desorption,good plateau characteristics and relatively low plateau pressure,hence it is suitable for the storage of hydrogen isotopes.The enthalpy and entropy for formation of ScMn_2 hydride at concentration corresponding to room temperature plateau pressure are -45 kJ/mol and -80 J/(K·mol),respectively.The hydriding kinetics of the alloy can be interpreted by Johnson-Mehl-Avrami(JMA) model,with the estimated reaction order of 0.4.The apparent activation energies for hydriding and deteuriding process are estimated to be (16±0.3) and(19±1.7) kJ/mol,respectively,the observed isotope effect on kinetics can possibly be applied to separation of hydrogen isotope.The passivated hydride can release completely at 639 K and the corresponding apparent activation energy is(144±14) kJ/mol." @default.
- W2382799421 created "2016-06-24" @default.
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- W2382799421 date "2012-01-01" @default.
- W2382799421 modified "2023-09-27" @default.
- W2382799421 title "HYDROGEN STORAGE PROPERTIES OF ScMn_2 ALLOY" @default.
- W2382799421 hasPublicationYear "2012" @default.
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