Issues »  Volume 39, Issue 11

Influence of Admixtures of Si, Fe, Ti on Temperature and Kinetics of Dissociation of MgH$_2$ Obtained by Reactive Mechanical Alloyage

O. G. Ershova, V. D. Dobrovolsky, Yu. M. Solonin, O. Yu. Koval

I. M. Frantsevich Institute for Problems in Materials Science, NAS of Ukraine, 3 Academician Krzhyzhanovsky Str., UA-03142 Kyiv, Ukraine

Received: 28.08.2017. Download: PDF

The mechanical alloy MА (Mg + 5% wt. Si + 5% wt. Fe + 2% wt. Ti) is synthesized by the method of reactive mechanical alloyage (RMA). At hydrogen pressure of 0.1 MPa, the hydrogen capacity, thermal stability, and kinetics of hydrogen desorption from the MgH$_2$ hydride phase obtained by means of the MA are studied with the use of thermal desorption spectroscopy. As determined, the addition of Si, Ti, and Fe to magnesium leads to a significant improvement in the kinetics of hydrogen desorption from the MgH$_2$ hydride phase obtained by RMA. Due to this alloying, the decrease in the thermodynamical stability of MgH$_2$ is not revealed. Hydrogen capacity of MА after reactive grinding for 20 hours is found to be equal to 5.6% wt. and after the first cycles of hydrogen sorption–desorption—to 5.1% wt.

Key words: sorption–desorption kinetics, hydrogen-sorption properties, mechanical alloy, thermal stability, thermodesorption spectroscopy.

URL: http://mfint.imp.kiev.ua/en/abstract/v39/i11/1557.html

DOI: https://doi.org/10.15407/mfint.39.11.1557

PACS: 61.72.Ff, 61.72.S-, 68.43.Mn, 68.43.Nr, 81.07.Bc, 81.20.Ev, 81.20.Wk, 88.30.rd

Citation: O. G. Ershova, V. D. Dobrovolsky, Yu. M. Solonin, and O. Yu. Koval, Influence of Admixtures of Si, Fe, Ti on Temperature and Kinetics of Dissociation of MgH$_2$ Obtained by Reactive Mechanical Alloyage, Metallofiz. Noveishie Tekhnol., 39, No. 11: 1557—1571 (2017) (in Ukrainian)

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