Crystal structure and hydrogen storage properties of La-Mg-Ni-Co alloy with superstructure

Y. J. Chai, K. Sakaki, K. Asano, H. Enoki, E. Akiba, T. Kohno

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

The crystal structure and hydrogen storage properties of the alloys La0.67Mg0.33Ni2.5Co0.5, La0.7Mg0.3Ni2.8Co0.5 and La0.75Mg0.25Ni3.0Co0.5 were investigated. X-ray diffraction results suggested that all the three samples were mainly composed of PuNi3-type, Ce2Ni7-type and Pr5Co19-type phase. These alloys reversibly absorbed and desorbed hydrogen up to ∼1.0 H/M under a hydrogen pressure of 2.5 MPa at 333 K. Moreover, the hexagonal structure of Ce2Ni7-type and Pr5Co19-type was retained during the absorption-desorption process. After hydrogenation, a volumetric expansion of 22.7% was observed for Ce2Ni7-type phase, and an expansion of 1.3% still remained after dehydrogenation.

Original languageEnglish
Pages (from-to)545-548
Number of pages4
JournalScripta Materialia
Volume57
Issue number6
DOIs
Publication statusPublished - Sep 1 2007

All Science Journal Classification (ASJC) codes

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

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