Synthesis and characterization of nanocrystalline Mg sub(2)CoH sub(5) obtained by mechanical alloying

The stoichiometric mixture of 2MgH sub(2) + Co was ball milled under a hydrogen atmosphere to synthesize nanocrystalline metal hydride Mg sub(2)CoH sub(5). Upon milling, the mixture was analyzed by X-ray powder diffraction (XRD) and thermal methods employing the techniques of differential scanning c...

Full description

Saved in:
Bibliographic Details
Published inJournal of materials science Vol. 36; no. 24; pp. 5829 - 5834
Main Authors Chen, J, Takeshita, H T, Chartouni, D, Kuriyama, N, Sakai, T
Format Journal Article
LanguageEnglish
Published 15.12.2001
Online AccessGet full text

Cover

More Information
Summary:The stoichiometric mixture of 2MgH sub(2) + Co was ball milled under a hydrogen atmosphere to synthesize nanocrystalline metal hydride Mg sub(2)CoH sub(5). 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 super(-1) H sub(2), respectively. At the temperatures of this study (553 to 653 K), hysteresis decreases with increasing temperature. copyright 2001 Kluwer Academic Publishers.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
content type line 23
ObjectType-Feature-1
ISSN:0022-2461