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

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

Research output: Contribution to journalArticle

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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

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Hydrogen storage
Hydrogen
Crystal structure
crystal structure
hydrogen
Dehydrogenation
Hydrogenation
Desorption
expansion
dehydrogenation
X ray diffraction
hydrogenation
desorption
diffraction
x rays

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Metals and Alloys

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Crystal structure and hydrogen storage properties of La-Mg-Ni-Co alloy with superstructure. / Chai, Y. J.; Sakaki, K.; Asano, K.; Enoki, H.; Akiba, Etsuo; Kohno, T.

In: Scripta Materialia, Vol. 57, No. 6, 01.09.2007, p. 545-548.

Research output: Contribution to journalArticle

Chai, Y. J. ; Sakaki, K. ; Asano, K. ; Enoki, H. ; Akiba, Etsuo ; Kohno, T. / Crystal structure and hydrogen storage properties of La-Mg-Ni-Co alloy with superstructure. In: Scripta Materialia. 2007 ; Vol. 57, No. 6. pp. 545-548.
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