Hydrogen sorption behavior of CaAl1.5Li0.5

Matvey Bereznitsky, Dmitry Mogilyanski, Isaac Jacob

Research output: Contribution to journalArticlepeer-review

Abstract

The hydrogen sorption properties of an alloy with nominal composition CaAl1.5Li0.5 have been investigated in a pursuit for hydrogen-absorbing Li-containing intermetallics. X-ray analysis of the original alloy indicated a coexistence of three closely related Laves phases. The maximum hydrogen capacity, recorded at about 6 MPa and 300 °C, was approximately 2.5 H atoms per formula unit (f.u.). Pressure-composition (p-c) isotherm measurements were taken in the temperature range between 350 and 450 °C up to pressures of 133 kPa. Thermodynamic parameters are derived for two plateau regions in the p-c isotherms. Analysis of these parameters and supporting evidence from X-ray patterns of hydrogenated and dehydrogenated samples suggest: (a) an initial irreversible disproportionation of the original alloy and (b) subsequent reversible hydrogenations, featuring reversible disproportionations of CaAl2 and LiAl intermetallic compounds. Attempts to form additional Li-containing intermetallics, namely CaAlLi, TiMn2−xLix (x = 0.2, 0.3, 0.4, 0.6) and TiAl2−xLix (x = 0.3, 0.5), and to hydrogenate them, are reported in brief.

Original languageEnglish
Article number331
JournalApplied Physics A: Materials Science and Processing
Volume122
Issue number4
DOIs
StatePublished - 1 Apr 2016

ASJC Scopus subject areas

  • Chemistry (all)
  • Materials Science (all)

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