The new ternary intermetallic NdNiMg5: Hydrogen sorption properties and more

Bassem Ourane, Etienne Gaudin, Yong Feng Lu, Ridha Zouari, Abdelhamid Ben Salah, Jean Louis Bobet

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

The hydrogen sorption properties of the new compound NdNiMg5 have been investigated. The compound starts to absorb hydrogen at 573 K under a pressure of 1 MPa. The absorption leads to the decomposition into two binary hydrides MgH2 and NdH2.6, and a ternary hydride Mg2NiH4. The maximum hydrogen sorption capacity reached is 3.2 wt.% and the cycling properties of the mixture decreases quickly due to grain growth. The activation energies for absorption and desorption are estimated to be equal to 14(3) kJ/mol H2 and 110(9) kJ/mol H2, respectively. Preliminary studies of the mechanical properties were also performed. Despite the high content in magnesium, NdNiMg5 exhibits an average microhardness of 210 Hv and a reduced Young Modulus of 9(1) GPa.

Original languageEnglish (US)
Pages (from-to)275-279
Number of pages5
JournalMaterials Research Bulletin
Volume61
DOIs
StatePublished - Jan 2015

Keywords

  • A. Inorganic compounds
  • C. Electron microscopy
  • D. Crystal structure
  • D. Energy storage

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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