Direct hydrogenation of Mg and decomposition behavior of the hydride formed

Under the catalytic action of ZrFe1.4Cr0.6, magnesium was hydrided into nan ostructured MgH2 and gamma -MgH2 directly by reaction ball-milling. The for mation and decomposition behaviors of the hydrided phases were characterize d by X-ray diffraction and thermal analysis (TGA and DSC). The hydrided pha ses thus formed possess excellent dehydriding kinetics. Based on the calcul ation of local activation energy, the decomposition mechanism of the hydrid ed phases was probed. (C) 2000 Elsevier Science B.V. All rights reserved.