Deuterium thermal desorption from Ni-rich deuterated Mg thin films

N. Patel, A. Kale, P. Mosaner, R. Checchetto, A. Miotello, G. Das

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Mg-Ni multilayers and Ni-rich Mg thin films were deposited by electron gun and pulsed laser deposition, respectively. Samples were submitted to thermal treatment in deuterium or hydrogen atmosphere at 423 K and ∼105 Pa pressure to promote the metal to hydride phase transition. The H chemical bonding in the multilayer samples, after annealing in H2 atmosphere, was examined by Fourier transform infrared spectroscopy: the obtained spectra suggest that the samples with the Mg:Ni=2:1 atomic ratio contain the Mg2NiH4 phase while the samples with lower Ni concentration contain both the MgH2 and the Mg2NiH4 phases. The effect of the Ni additive on the stability of the deuteride phase was studied by thermal desorption spectroscopy (TDS). The TDS spectra of the single-phase Mg2NiD4 samples show a TDS peak at 400 K. The TDS spectra of the two-phase samples show both the D2 desorption peak at 400 K and a second peak at higher temperature that we attributed to the dissociation of the MgD2 phase. The high-temperature peak shifts to lower temperatures by increasing the Ni content. It is suggested that in the two-phase samples, the lattice volumes having the Mg2Ni structure resulting from the dissociation of the Mg2NiD4 phase reduce the thermodynamic stability of the MgD2 phase.

Original languageBritish English
Pages (from-to)232-236
Number of pages5
JournalRenewable Energy
Volume33
Issue number2
DOIs
StatePublished - Feb 2008

Keywords

  • Hydrogen storage
  • Metal hydrides
  • Thermal desorption

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