期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 424, 期 1-2, 页码 356-364出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2005.12.087
关键词
hydrogen storage materials; nanostructured magnesium hydride; particle size; nanograin size; desorption temperature; differential scanning calorimetry; X-ray diffraction
In the present work the hydrogen desorption properties of nanostructured magnesium hydride (MgH2) synthesized by controlled reactive mechanical milling (CRMM) of elemental Mg powder under hydrogen are investigated. A profound effect of the particle size of synthesized MgH2 hydride on its hydrogen desorption characteristics measured by differential scanning calorimetery (DSC) has been found. All synthesized MgH2 powders are characterized by a double hydrogen desorption peak. Furthermore, below a certain threshold particle size the DSC desorption temperature of the peak doublet starts decreasing rapidly with decreasing of the mean hydride powder particle size (expressed as equivalent circle diameter-ECD). In contrast, the nanograin (crystallite) size of MgH2 does not seem to have apparent effect on the DSC desorption temperature. It is also observed that for powder particles smaller than some threshold value, X-ray diffraction shows the presence of two polymorphic forms of magnesium hydride: beta- and gamma-MgH2. The role of both the particle size and the duality of hydride phase in the desorption process is discussed. (c) 2006 Elsevier B.V. All rights reserved.
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