Synthesis and characterization of nanocrystalline Mg2CoH5 obtained by mechanical alloying View Full Text


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Article Info

DATE

2001-12

AUTHORS

J. Chen, H. T. Takeshita, D. Chartouni, N. Kuriyama, T. Sakai

ABSTRACT

The stoichiometric mixture of 2MgH2 + Co was ball milled under a hydrogen atmosphere to synthesize nanocrystalline metal hydride Mg2CoH5. Upon milling, the mixture was analyzed by X-ray powder diffraction (XRD) and thermal methods employing the techniques of differential scanning calorimetry (DSC), thermogravimetry (TG) and differential thermal analysis (DTA). Hydrogen absorption and desorption measured by pressure-composition-temperature (P-C-T) curves indicated that the capacity loss was small after 20 consecutive cycling tests. The enthalpies associated with hydride formation and decomposition were measured to be −69.5 and −83.2 kJ mol−1 H2, respectively. At the temperatures of this study (553 to 653 K), hysteresis decreases with increasing temperature. More... »

PAGES

5829-5834

References to SciGraph publications

  • 1983-02. Storing energy in metal hydrides: a review of the physical metallurgy in JOURNAL OF MATERIALS SCIENCE
  • 1998-10. Mg2Ni alloy for metal hydride electrodes in JOURNAL OF MATERIALS SCIENCE
  • 1993-12. Amorphous and nanocrystalline Fe–Ti prepared by ball milling in JOURNAL OF MATERIALS RESEARCH
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    http://scigraph.springernature.com/pub.10.1023/a:1012960206480

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    http://dx.doi.org/10.1023/a:1012960206480

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